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688 lines
30 KiB
688 lines
30 KiB
/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This header file defines the interface that the SQLite library
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** presents to client programs.
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**
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** @(#) $Id: sqlite.h 614463 2006-12-17 21:08:15Z staniek $
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*/
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#ifndef _SQLITE_H_
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#define _SQLITE_H_
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#include <stdarg.h> /* Needed for the definition of va_list */
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/*
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** Make sure we can call this stuff from C++.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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** The version of the SQLite library.
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*/
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#define SQLITE_VERSION "2.8.2"
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/*
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** The version string is also compiled into the library so that a program
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** can check to make sure that the lib*.a file and the *.h file are from
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** the same version.
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*/
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extern const char sqlite_version[];
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/*
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** The SQLITE_UTF8 macro is defined if the library expects to see
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** UTF-8 encoded data. The SQLITE_ISO8859 macro is defined if the
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** iso8859 encoded should be used.
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*/
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#define SQLITE_ISO8859 1
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/*
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** The following constant holds one of two strings, "UTF-8" or "iso8859",
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** depending on which character encoding the SQLite library expects to
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** see. The character encoding makes a difference for the LIKE and GLOB
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** operators and for the LENGTH() and SUBSTR() functions.
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*/
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extern const char sqlite_encoding[];
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/*
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** Each open sqlite database is represented by an instance of the
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** following opaque structure.
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*/
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typedef struct sqlite sqlite;
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/*
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** A function to open a new sqlite database.
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**
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** If the database does not exist and mode indicates write
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** permission, then a new database is created. If the database
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** does not exist and mode does not indicate write permission,
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** then the open fails, an error message generated (if errmsg!=0)
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** and the function returns 0.
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**
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** If mode does not indicates user write permission, then the
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** database is opened read-only.
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**
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** The Truth: As currently implemented, all databases are opened
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** for writing all the time. Maybe someday we will provide the
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** ability to open a database readonly. The mode parameters is
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** provided in anticipation of that enhancement.
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*/
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sqlite *sqlite_open(const char *filename, int mode, char **errmsg);
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/*
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** A function to close the database.
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**
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** Call this function with a pointer to a structure that was previously
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** returned from sqlite_open() and the corresponding database will by closed.
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*/
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void sqlite_close(sqlite *);
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/*
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** The type for a callback function.
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*/
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typedef int (*sqlite_callback)(void*,int,char**, char**);
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/*
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** A function to executes one or more statements of SQL.
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**
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** If one or more of the SQL statements are queries, then
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** the callback function specified by the 3rd parameter is
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** invoked once for each row of the query result. This callback
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** should normally return 0. If the callback returns a non-zero
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** value then the query is aborted, all subsequent SQL statements
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** are skipped and the sqlite_exec() function returns the SQLITE_ABORT.
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**
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** The 4th parameter is an arbitrary pointer that is passed
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** to the callback function as its first parameter.
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**
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** The 2nd parameter to the callback function is the number of
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** columns in the query result. The 3rd parameter to the callback
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** is an array of strings holding the values for each column.
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** The 4th parameter to the callback is an array of strings holding
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** the names of each column.
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**
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** The callback function may be NULL, even for queries. A NULL
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** callback is not an error. It just means that no callback
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** will be invoked.
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**
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** If an error occurs while parsing or evaluating the SQL (but
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** not while executing the callback) then an appropriate error
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** message is written into memory obtained from malloc() and
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** *errmsg is made to point to that message. The calling function
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** is responsible for freeing the memory that holds the error
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** message. Use sqlite_freemem() for this. If errmsg==NULL,
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** then no error message is ever written.
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**
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** The return value is is SQLITE_OK if there are no errors and
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** some other return code if there is an error. The particular
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** return value depends on the type of error.
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**
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** If the query could not be executed because a database file is
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** locked or busy, then this function returns SQLITE_BUSY. (This
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** behavior can be modified somewhat using the sqlite_busy_handler()
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** and sqlite_busy_timeout() functions below.)
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*/
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int sqlite_exec(
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sqlite*, /* An open database */
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const char *sql, /* SQL to be executed */
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sqlite_callback, /* Callback function */
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void *, /* 1st argument to callback function */
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char **errmsg /* Error msg written here */
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);
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/*
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** Return values for sqlite_exec() and sqlite_step()
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*/
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#define SQLITE_OK 0 /* Successful result */
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#define SQLITE_ERROR 1 /* SQL error or missing database */
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#define SQLITE_INTERNAL 2 /* An internal logic error in SQLite */
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#define SQLITE_PERM 3 /* Access permission denied */
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#define SQLITE_ABORT 4 /* Callback routine requested an abort */
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#define SQLITE_BUSY 5 /* The database file is locked */
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#define SQLITE_LOCKED 6 /* A table in the database is locked */
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#define SQLITE_NOMEM 7 /* A malloc() failed */
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#define SQLITE_READONLY 8 /* Attempt to write a readonly database */
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#define SQLITE_INTERRUPT 9 /* Operation terminated by sqlite_interrupt() */
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#define SQLITE_IOERR 10 /* Some kind of disk I/O error occurred */
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#define SQLITE_CORRUPT 11 /* The database disk image is malformed */
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#define SQLITE_NOTFOUND 12 /* (Internal Only) Table or record not found */
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#define SQLITE_FULL 13 /* Insertion failed because database is full */
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#define SQLITE_CANTOPEN 14 /* Unable to open the database file */
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#define SQLITE_PROTOCOL 15 /* Database lock protocol error */
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#define SQLITE_EMPTY 16 /* (Internal Only) Database table is empty */
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#define SQLITE_SCHEMA 17 /* The database schema changed */
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#define SQLITE_TOOBIG 18 /* Too much data for one row of a table */
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#define SQLITE_CONSTRAINT 19 /* Abort due to contraint violation */
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#define SQLITE_MISMATCH 20 /* Data type mismatch */
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#define SQLITE_MISUSE 21 /* Library used incorrectly */
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#define SQLITE_NOLFS 22 /* Uses OS features not supported on host */
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#define SQLITE_AUTH 23 /* Authorization denied */
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#define SQLITE_FORMAT 24 /* Auxiliary database format error */
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#define SQLITE_ROW 100 /* sqlite_step() has another row ready */
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#define SQLITE_DONE 101 /* sqlite_step() has finished executing */
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/*
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** Each entry in an SQLite table has a unique integer key. (The key is
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** the value of the INTEGER PRIMARY KEY column if there is such a column,
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** otherwise the key is generated at random. The unique key is always
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** available as the ROWID, OID, or _ROWID_ column.) The following routine
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** returns the integer key of the most recent insert in the database.
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**
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** This function is similar to the mysql_insert_id() function from MySQL.
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*/
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int sqlite_last_insert_rowid(sqlite*);
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/*
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** This function returns the number of database rows that were changed
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** (or inserted or deleted) by the most recent called sqlite_exec().
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**
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** All changes are counted, even if they were later undone by a
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** ROLLBACK or ABORT. Except, changes associated with creating and
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** dropping tables are not counted.
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**
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** If a callback invokes sqlite_exec() recursively, then the changes
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** in the inner, recursive call are counted together with the changes
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** in the outer call.
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**
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** SQLite implements the command "DELETE FROM table" without a WHERE clause
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** by dropping and recreating the table. (This is much faster than going
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** through and deleting individual elements form the table.) Because of
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** this optimization, the change count for "DELETE FROM table" will be
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** zero regardless of the number of elements that were originally in the
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** table. To get an accurate count of the number of rows deleted, use
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** "DELETE FROM table WHERE 1" instead.
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*/
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int sqlite_changes(sqlite*);
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/* If the parameter to this routine is one of the return value constants
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** defined above, then this routine returns a constant text string which
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** descripts (in English) the meaning of the return value.
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*/
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const char *sqlite_error_string(int);
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#define sqliteErrStr sqlite_error_string /* Legacy. Do not use in new code. */
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/* This function causes any pending database operation to abort and
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** return at its earliest opportunity. This routine is typically
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** called in response to a user action such as pressing "Cancel"
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** or Ctrl-C where the user wants a long query operation to halt
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** immediately.
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*/
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void sqlite_interrupt(sqlite*);
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/* This function returns true if the given input string comprises
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** one or more complete SQL statements.
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**
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** The algorithm is simple. If the last token other than spaces
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** and comments is a semicolon, then return true. otherwise return
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** false.
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*/
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int sqlite_complete(const char *sql);
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/*
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** This routine identifies a callback function that is invoked
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** whenever an attempt is made to open a database table that is
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** currently locked by another process or thread. If the busy callback
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** is NULL, then sqlite_exec() returns SQLITE_BUSY immediately if
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** it finds a locked table. If the busy callback is not NULL, then
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** sqlite_exec() invokes the callback with three arguments. The
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** second argument is the name of the locked table and the third
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** argument is the number of times the table has been busy. If the
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** busy callback returns 0, then sqlite_exec() immediately returns
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** SQLITE_BUSY. If the callback returns non-zero, then sqlite_exec()
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** tries to open the table again and the cycle repeats.
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**
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** The default busy callback is NULL.
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**
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** Sqlite is re-entrant, so the busy handler may start a new query.
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** (It is not clear why anyone would every want to do this, but it
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** is allowed, in theory.) But the busy handler may not close the
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** database. Closing the database from a busy handler will delete
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** data structures out from under the executing query and will
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** probably result in a coredump.
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*/
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void sqlite_busy_handler(sqlite*, int(*)(void*,const char*,int), void*);
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/*
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** This routine sets a busy handler that sleeps for a while when a
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** table is locked. The handler will sleep multiple times until
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** at least "ms" milleseconds of sleeping have been done. After
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** "ms" milleseconds of sleeping, the handler returns 0 which
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** causes sqlite_exec() to return SQLITE_BUSY.
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**
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** Calling this routine with an argument less than or equal to zero
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** turns off all busy handlers.
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*/
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void sqlite_busy_timeout(sqlite*, int ms);
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/*
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** This next routine is really just a wrapper around sqlite_exec().
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** Instead of invoking a user-supplied callback for each row of the
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** result, this routine remembers each row of the result in memory
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** obtained from malloc(), then returns all of the result after the
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** query has finished.
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**
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** As an example, suppose the query result where this table:
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**
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** Name | Age
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** -----------------------
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** Alice | 43
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** Bob | 28
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** Cindy | 21
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**
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** If the 3rd argument were &azResult then after the function returns
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** azResult will contain the following data:
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**
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** azResult[0] = "Name";
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** azResult[1] = "Age";
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** azResult[2] = "Alice";
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** azResult[3] = "43";
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** azResult[4] = "Bob";
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** azResult[5] = "28";
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** azResult[6] = "Cindy";
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** azResult[7] = "21";
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**
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** Notice that there is an extra row of data containing the column
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** headers. But the *nrow return value is still 3. *ncolumn is
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** set to 2. In general, the number of values inserted into azResult
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** will be ((*nrow) + 1)*(*ncolumn).
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**
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** After the calling function has finished using the result, it should
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** pass the result data pointer to sqlite_free_table() in order to
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** release the memory that was malloc-ed. Because of the way the
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** malloc() happens, the calling function must not try to call
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** malloc() directly. Only sqlite_free_table() is able to release
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** the memory properly and safely.
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**
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** The return value of this routine is the same as from sqlite_exec().
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*/
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int sqlite_get_table(
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sqlite*, /* An open database */
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const char *sql, /* SQL to be executed */
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char ***resultp, /* Result written to a char *[] that this points to */
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int *nrow, /* Number of result rows written here */
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int *ncolumn, /* Number of result columns written here */
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char **errmsg /* Error msg written here */
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);
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/*
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** Call this routine to free the memory that sqlite_get_table() allocated.
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*/
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void sqlite_free_table(char **result);
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/*
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** The following routines are wrappers around sqlite_exec() and
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** sqlite_get_table(). The only difference between the routines that
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** follow and the originals is that the second argument to the
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** routines that follow is really a printf()-style format
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** string describing the SQL to be executed. Arguments to the format
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** string appear at the end of the argument list.
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**
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** All of the usual printf formatting options apply. In addition, there
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** is a "%q" option. %q works like %s in that it substitutes a null-terminated
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** string from the argument list. But %q also doubles every '\'' character.
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** %q is designed for use inside a string literal. By doubling each '\''
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** character it escapes that character and allows it to be inserted into
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** the string.
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**
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** For example, so some string variable contains text as follows:
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**
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** char *zText = "It's a happy day!";
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**
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** We can use this text in an SQL statement as follows:
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**
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** sqlite_exec_printf(db, "INSERT INTO table VALUES('%q')",
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** callback1, 0, 0, zText);
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**
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** Because the %q format string is used, the '\'' character in zText
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** is escaped and the SQL generated is as follows:
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**
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** INSERT INTO table1 VALUES('It''s a happy day!')
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**
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** This is correct. Had we used %s instead of %q, the generated SQL
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** would have looked like this:
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**
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** INSERT INTO table1 VALUES('It's a happy day!');
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**
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** This second example is an SQL syntax error. As a general rule you
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** should always use %q instead of %s when inserting text into a string
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** literal.
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*/
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int sqlite_exec_printf(
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sqlite*, /* An open database */
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const char *sqlFormat, /* printf-style format string for the SQL */
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sqlite_callback, /* Callback function */
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void *, /* 1st argument to callback function */
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char **errmsg, /* Error msg written here */
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... /* Arguments to the format string. */
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);
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int sqlite_exec_vprintf(
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sqlite*, /* An open database */
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const char *sqlFormat, /* printf-style format string for the SQL */
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sqlite_callback, /* Callback function */
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void *, /* 1st argument to callback function */
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char **errmsg, /* Error msg written here */
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va_list ap /* Arguments to the format string. */
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);
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int sqlite_get_table_printf(
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sqlite*, /* An open database */
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const char *sqlFormat, /* printf-style format string for the SQL */
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char ***resultp, /* Result written to a char *[] that this points to */
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int *nrow, /* Number of result rows written here */
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int *ncolumn, /* Number of result columns written here */
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char **errmsg, /* Error msg written here */
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... /* Arguments to the format string */
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);
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int sqlite_get_table_vprintf(
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sqlite*, /* An open database */
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const char *sqlFormat, /* printf-style format string for the SQL */
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char ***resultp, /* Result written to a char *[] that this points to */
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int *nrow, /* Number of result rows written here */
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int *ncolumn, /* Number of result columns written here */
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char **errmsg, /* Error msg written here */
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va_list ap /* Arguments to the format string */
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);
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char *sqlite_mprintf(const char*,...);
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/*
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** Windows systems should call this routine to free memory that
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** is returned in the in the errmsg parameter of sqlite_open() when
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** SQLite is a DLL. For some reason, it does not work to call free()
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** directly.
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*/
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void sqlite_freemem(void *p);
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|
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/*
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** Windows systems need functions to call to return the sqlite_version
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** and sqlite_encoding strings.
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*/
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const char *sqlite_libversion(void);
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const char *sqlite_libencoding(void);
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|
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/*
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|
** A pointer to the following structure is used to communicate with
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** the implementations of user-defined functions.
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*/
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typedef struct sqlite_func sqlite_func;
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/*
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** Use the following routines to create new user-defined functions. See
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** the documentation for details.
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*/
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int sqlite_create_function(
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sqlite*, /* Database where the new function is registered */
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const char *zName, /* Name of the new function */
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|
int nArg, /* Number of arguments. -1 means any number */
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void (*xFunc)(sqlite_func*,int,const char**), /* C code to implement */
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|
void *pUserData /* Available via the sqlite_user_data() call */
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);
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int sqlite_create_aggregate(
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sqlite*, /* Database where the new function is registered */
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const char *zName, /* Name of the function */
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int nArg, /* Number of arguments */
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void (*xStep)(sqlite_func*,int,const char**), /* Called for each row */
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|
void (*xFinalize)(sqlite_func*), /* Called once to get final result */
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|
void *pUserData /* Available via the sqlite_user_data() call */
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);
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/*
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|
** Use the following routine to define the datatype returned by a
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** user-defined function. The second argument can be one of the
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** constants SQLITE_NUMERIC, SQLITE_TEXT, or SQLITE_ARGS or it
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** can be an integer greater than or equal to zero. The datatype
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** will be numeric or text (the only two types supported) if the
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** argument is SQLITE_NUMERIC or SQLITE_TEXT. If the argument is
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** SQLITE_ARGS, then the datatype is numeric if any argument to the
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** function is numeric and is text otherwise. If the second argument
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** is an integer, then the datatype of the result is the same as the
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** parameter to the function that corresponds to that integer.
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*/
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int sqlite_function_type(
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sqlite *db, /* The database there the function is registered */
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const char *zName, /* Name of the function */
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int datatype /* The datatype for this function */
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);
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#define SQLITE_NUMERIC (-1)
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#define SQLITE_TEXT (-2)
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#define SQLITE_ARGS (-3)
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/*
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|
** The user function implementations call one of the following four routines
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|
** in order to return their results. The first parameter to each of these
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|
** routines is a copy of the first argument to xFunc() or xFinialize().
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|
** The second parameter to these routines is the result to be returned.
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|
** A NULL can be passed as the second parameter to sqlite_set_result_string()
|
|
** in order to return a NULL result.
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**
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** The 3rd argument to _string and _error is the number of characters to
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** take from the string. If this argument is negative, then all characters
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** up to and including the first '\000' are used.
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**
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|
** The sqlite_set_result_string() function allocates a buffer to hold the
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** result and returns a pointer to this buffer. The calling routine
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|
** (that is, the implementation of a user function) can alter the content
|
|
** of this buffer if desired.
|
|
*/
|
|
char *sqlite_set_result_string(sqlite_func*,const char*,int);
|
|
void sqlite_set_result_int(sqlite_func*,int);
|
|
void sqlite_set_result_double(sqlite_func*,double);
|
|
void sqlite_set_result_error(sqlite_func*,const char*,int);
|
|
|
|
/*
|
|
** The pUserData parameter to the sqlite_create_function() and
|
|
** sqlite_create_aggregate() routines used to register user functions
|
|
** is available to the implementation of the function using this
|
|
** call.
|
|
*/
|
|
void *sqlite_user_data(sqlite_func*);
|
|
|
|
/*
|
|
** Aggregate functions use the following routine to allocate
|
|
** a structure for storing their state. The first time this routine
|
|
** is called for a particular aggregate, a new structure of size nBytes
|
|
** is allocated, zeroed, and returned. On subsequent calls (for the
|
|
** same aggregate instance) the same buffer is returned. The implementation
|
|
** of the aggregate can use the returned buffer to accumulate data.
|
|
**
|
|
** The buffer allocated is freed automatically be SQLite.
|
|
*/
|
|
void *sqlite_aggregate_context(sqlite_func*, int nBytes);
|
|
|
|
/*
|
|
** The next routine returns the number of calls to xStep for a particular
|
|
** aggregate function instance. The current call to xStep counts so this
|
|
** routine always returns at least 1.
|
|
*/
|
|
int sqlite_aggregate_count(sqlite_func*);
|
|
|
|
/*
|
|
** This routine registers a callback with the SQLite library. The
|
|
** callback is invoked (at compile-time, not at run-time) for each
|
|
** attempt to access a column of a table in the database. The callback
|
|
** returns SQLITE_OK if access is allowed, SQLITE_DENY if the entire
|
|
** SQL statement should be aborted with an error and SQLITE_IGNORE
|
|
** if the column should be treated as a NULL value.
|
|
*/
|
|
int sqlite_set_authorizer(
|
|
sqlite*,
|
|
int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
|
|
void *pUserData
|
|
);
|
|
|
|
/*
|
|
** The second parameter to the access authorization function above will
|
|
** be one of the values below. These values signify what kind of operation
|
|
** is to be authorized. The 3rd and 4th parameters to the authorization
|
|
** function will be parameters or NULL depending on which of the following
|
|
** codes is used as the second parameter. The 5th parameter is the name
|
|
** of the database ("main", "temp", etc.) if applicable. The 6th parameter
|
|
** is the name of the inner-most trigger or view that is responsible for
|
|
** the access attempt or NULL if this access attempt is directly from
|
|
** input SQL code.
|
|
**
|
|
** Arg-3 Arg-4
|
|
*/
|
|
#define SQLITE_COPY 0 /* Table Name File Name */
|
|
#define SQLITE_CREATE_INDEX 1 /* Index Name Table Name */
|
|
#define SQLITE_CREATE_TABLE 2 /* Table Name NULL */
|
|
#define SQLITE_CREATE_TEMP_INDEX 3 /* Index Name Table Name */
|
|
#define SQLITE_CREATE_TEMP_TABLE 4 /* Table Name NULL */
|
|
#define SQLITE_CREATE_TEMP_TRIGGER 5 /* Trigger Name Table Name */
|
|
#define SQLITE_CREATE_TEMP_VIEW 6 /* View Name NULL */
|
|
#define SQLITE_CREATE_TRIGGER 7 /* Trigger Name Table Name */
|
|
#define SQLITE_CREATE_VIEW 8 /* View Name NULL */
|
|
#define SQLITE_DELETE 9 /* Table Name NULL */
|
|
#define SQLITE_DROP_INDEX 10 /* Index Name Table Name */
|
|
#define SQLITE_DROP_TABLE 11 /* Table Name NULL */
|
|
#define SQLITE_DROP_TEMP_INDEX 12 /* Index Name Table Name */
|
|
#define SQLITE_DROP_TEMP_TABLE 13 /* Table Name NULL */
|
|
#define SQLITE_DROP_TEMP_TRIGGER 14 /* Trigger Name Table Name */
|
|
#define SQLITE_DROP_TEMP_VIEW 15 /* View Name NULL */
|
|
#define SQLITE_DROP_TRIGGER 16 /* Trigger Name Table Name */
|
|
#define SQLITE_DROP_VIEW 17 /* View Name NULL */
|
|
#define SQLITE_INSERT 18 /* Table Name NULL */
|
|
#define SQLITE_PRAGMA 19 /* Pragma Name 1st arg or NULL */
|
|
#define SQLITE_READ 20 /* Table Name Column Name */
|
|
#define SQLITE_SELECT 21 /* NULL NULL */
|
|
#define SQLITE_TRANSACTION 22 /* NULL NULL */
|
|
#define SQLITE_UPDATE 23 /* Table Name Column Name */
|
|
|
|
/*
|
|
** The return value of the authorization function should be one of the
|
|
** following constants:
|
|
*/
|
|
/* #define SQLITE_OK 0 // Allow access (This is actually defined above) */
|
|
#define SQLITE_DENY 1 /* Abort the SQL statement with an error */
|
|
#define SQLITE_IGNORE 2 /* Don't allow access, but don't generate an error */
|
|
|
|
/*
|
|
** Register a function that is called at every invocation of sqlite_exec()
|
|
** or sqlite_compile(). This function can be used (for example) to generate
|
|
** a log file of all SQL executed against a database.
|
|
*/
|
|
void *sqlite_trace(sqlite*, void(*xTrace)(void*,const char*), void*);
|
|
|
|
/*** The Callback-Free API
|
|
**
|
|
** The following routines implement a new way to access SQLite that does not
|
|
** involve the use of callbacks.
|
|
**
|
|
** An sqlite_vm is an opaque object that represents a single SQL statement
|
|
** that is ready to be executed.
|
|
*/
|
|
typedef struct sqlite_vm sqlite_vm;
|
|
|
|
/*
|
|
** To execute an SQLite query without the use of callbacks, you first have
|
|
** to compile the SQL using this routine. The 1st parameter "db" is a pointer
|
|
** to an sqlite object obtained from sqlite_open(). The 2nd parameter
|
|
** "zSql" is the text of the SQL to be compiled. The remaining parameters
|
|
** are all outputs.
|
|
**
|
|
** *pzTail is made to point to the first character past the end of the first
|
|
** SQL statement in zSql. This routine only compiles the first statement
|
|
** in zSql, so *pzTail is left pointing to what remains uncompiled.
|
|
**
|
|
** *ppVm is left pointing to a "virtual machine" that can be used to execute
|
|
** the compiled statement. Or if there is an error, *ppVm may be set to NULL.
|
|
** If the input text contained no SQL (if the input is and empty string or
|
|
** a comment) then *ppVm is set to NULL.
|
|
**
|
|
** If any errors are detected during compilation, an error message is written
|
|
** into space obtained from malloc() and *pzErrMsg is made to point to that
|
|
** error message. The calling routine is responsible for freeing the text
|
|
** of this message when it has finished with it. Use sqlite_freemem() to
|
|
** free the message. pzErrMsg may be NULL in which case no error message
|
|
** will be generated.
|
|
**
|
|
** On success, SQLITE_OK is returned. Otherwise and error code is returned.
|
|
*/
|
|
int sqlite_compile(
|
|
sqlite *db, /* The open database */
|
|
const char *zSql, /* SQL statement to be compiled */
|
|
const char **pzTail, /* OUT: uncompiled tail of zSql */
|
|
sqlite_vm **ppVm, /* OUT: the virtual machine to execute zSql */
|
|
char **pzErrmsg /* OUT: Error message. */
|
|
);
|
|
|
|
/*
|
|
** After an SQL statement has been compiled, it is handed to this routine
|
|
** to be executed. This routine executes the statement as far as it can
|
|
** go then returns. The return value will be one of SQLITE_DONE,
|
|
** SQLITE_ERROR, SQLITE_BUSY, SQLITE_ROW, or SQLITE_MISUSE.
|
|
**
|
|
** SQLITE_DONE means that the execute of the SQL statement is complete
|
|
** an no errors have occurred. sqlite_step() should not be called again
|
|
** for the same virtual machine. *pN is set to the number of columns in
|
|
** the result set and *pazColName is set to an array of strings that
|
|
** describe the column names and datatypes. The name of the i-th column
|
|
** is (*pazColName)[i] and the datatype of the i-th column is
|
|
** (*pazColName)[i+*pN]. *pazValue is set to NULL.
|
|
**
|
|
** SQLITE_ERROR means that the virtual machine encountered a run-time
|
|
** error. sqlite_step() should not be called again for the same
|
|
** virtual machine. *pN is set to 0 and *pazColName and *pazValue are set
|
|
** to NULL. Use sqlite_finalize() to obtain the specific error code
|
|
** and the error message text for the error.
|
|
**
|
|
** SQLITE_BUSY means that an attempt to open the database failed because
|
|
** another thread or process is holding a lock. The calling routine
|
|
** can try again to open the database by calling sqlite_step() again.
|
|
** The return code will only be SQLITE_BUSY if no busy handler is registered
|
|
** using the sqlite_busy_handler() or sqlite_busy_timeout() routines. If
|
|
** a busy handler callback has been registered but returns 0, then this
|
|
** routine will return SQLITE_ERROR and sqltie_finalize() will return
|
|
** SQLITE_BUSY when it is called.
|
|
**
|
|
** SQLITE_ROW means that a single row of the result is now available.
|
|
** The data is contained in *pazValue. The value of the i-th column is
|
|
** (*azValue)[i]. *pN and *pazColName are set as described in SQLITE_DONE.
|
|
** Invoke sqlite_step() again to advance to the next row.
|
|
**
|
|
** SQLITE_MISUSE is returned if sqlite_step() is called incorrectly.
|
|
** For example, if you call sqlite_step() after the virtual machine
|
|
** has halted (after a prior call to sqlite_step() has returned SQLITE_DONE)
|
|
** or if you call sqlite_step() with an incorrectly initialized virtual
|
|
** machine or a virtual machine that has been deleted or that is associated
|
|
** with an sqlite structure that has been closed.
|
|
*/
|
|
int sqlite_step(
|
|
sqlite_vm *pVm, /* The virtual machine to execute */
|
|
int *pN, /* OUT: Number of columns in result */
|
|
const char ***pazValue, /* OUT: Column data */
|
|
const char ***pazColName /* OUT: Column names and datatypes */
|
|
);
|
|
|
|
/*
|
|
** This routine is called to delete a virtual machine after it has finished
|
|
** executing. The return value is the result code. SQLITE_OK is returned
|
|
** if the statement executed successfully and some other value is returned if
|
|
** there was any kind of error. If an error occurred and pzErrMsg is not
|
|
** NULL, then an error message is written into memory obtained from malloc()
|
|
** and *pzErrMsg is made to point to that error message. The calling routine
|
|
** should use sqlite_freemem() to delete this message when it has finished
|
|
** with it.
|
|
**
|
|
** This routine can be called at any point during the execution of the
|
|
** virtual machine. If the virtual machine has not completed execution
|
|
** when this routine is called, that is like encountering an error or
|
|
** an interrupt. (See sqlite_interrupt().) Incomplete updates may be
|
|
** rolled back and transactions cancelled, depending on the circumstances,
|
|
** and the result code returned will be SQLITE_ABORT.
|
|
*/
|
|
int sqlite_finalize(sqlite_vm*, char **pzErrMsg);
|
|
|
|
#ifdef __cplusplus
|
|
} /* End of the 'extern "C"' block */
|
|
#endif
|
|
|
|
#endif /* _SQLITE_H_ */
|