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296 lines
18 KiB
296 lines
18 KiB
13 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/sql/qsqldriver.cpp:52 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQSqlDriver Class</title>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQSqlDriver Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1>
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<p>The TQSqlDriver class is an abstract base class for accessing
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SQL databases.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsqldriver-h.html">ntqsqldriver.h</a>></tt>
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<p>Inherits <a href="ntqobject.html">TQObject</a>.
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<p><a href="qsqldriver-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>enum <a href="#DriverFeature-enum"><b>DriverFeature</b></a> { Transactions, QuerySize, BLOB, Unicode, PreparedQueries, NamedPlaceholders, PositionalPlaceholders }</li>
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<li class=fn><a href="#TQSqlDriver"><b>TQSqlDriver</b></a> ( TQObject * parent = 0, const char * name = 0 )</li>
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<li class=fn><a href="#~TQSqlDriver"><b>~TQSqlDriver</b></a> ()</li>
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<li class=fn>bool <a href="#isOpen"><b>isOpen</b></a> () const</li>
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<li class=fn>bool <a href="#isOpenError"><b>isOpenError</b></a> () const</li>
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<li class=fn>virtual bool <a href="#beginTransaction"><b>beginTransaction</b></a> ()</li>
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<li class=fn>virtual bool <a href="#commitTransaction"><b>commitTransaction</b></a> ()</li>
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<li class=fn>virtual bool <a href="#rollbackTransaction"><b>rollbackTransaction</b></a> ()</li>
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<li class=fn>virtual TQStringList <a href="#tables"><b>tables</b></a> ( const TQString & tableType ) const</li>
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<li class=fn>virtual TQSqlIndex <a href="#primaryIndex"><b>primaryIndex</b></a> ( const TQString & tableName ) const</li>
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<li class=fn>virtual TQSqlRecord <a href="#record"><b>record</b></a> ( const TQString & tableName ) const</li>
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<li class=fn>virtual TQSqlRecord <a href="#record-2"><b>record</b></a> ( const TQSqlQuery & query ) const</li>
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<li class=fn>virtual TQSqlRecordInfo <a href="#recordInfo"><b>recordInfo</b></a> ( const TQString & tablename ) const</li>
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<li class=fn>virtual TQSqlRecordInfo <a href="#recordInfo-2"><b>recordInfo</b></a> ( const TQSqlQuery & query ) const</li>
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<li class=fn>virtual TQString <a href="#nullText"><b>nullText</b></a> () const</li>
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<li class=fn>virtual TQString <a href="#formatValue"><b>formatValue</b></a> ( const TQSqlField * field, bool trimStrings = FALSE ) const</li>
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<li class=fn>TQSqlError <a href="#lastError"><b>lastError</b></a> () const</li>
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<li class=fn>virtual bool <a href="#hasFeature"><b>hasFeature</b></a> ( DriverFeature f ) const = 0</li>
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<li class=fn>virtual bool <a href="#open"><b>open</b></a> ( const TQString & db, const TQString & user = TQString::null, const TQString & password = TQString::null, const TQString & host = TQString::null, int port = -1 ) = 0</li>
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<li class=fn>virtual void <a href="#close"><b>close</b></a> () = 0</li>
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<li class=fn>virtual TQSqlQuery <a href="#createQuery"><b>createQuery</b></a> () const = 0</li>
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<li class=fn>bool <a href="#open-2"><b>open</b></a> ( const TQString & db, const TQString & user, const TQString & password, const TQString & host, int port, const TQString & connOpts )</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual void <a href="#setOpen"><b>setOpen</b></a> ( bool o )</li>
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<li class=fn>virtual void <a href="#setOpenError"><b>setOpenError</b></a> ( bool e )</li>
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<li class=fn>virtual void <a href="#setLastError"><b>setLastError</b></a> ( const TQSqlError & e )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQSqlDriver class is an abstract base class for accessing
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SQL databases.
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<p>
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<p> This class should not be used directly. Use <a href="ntqsqldatabase.html">TQSqlDatabase</a> instead.
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<p>See also <a href="database.html">Database Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="DriverFeature-enum"></a>TQSqlDriver::DriverFeature</h3>
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<p> This enum contains a list of features a driver may support. Use
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<a href="#hasFeature">hasFeature</a>() to query whether a feature is supported or not.
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<ul>
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<li><tt>TQSqlDriver::Transactions</tt> - whether the driver supports SQL transactions
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<li><tt>TQSqlDriver::QuerySize</tt> - whether the database is capable of reporting the size
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of a query. Note that some databases do not support returning the size
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(i.e. number of rows returned) of a query, in which case
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<a href="ntqsqlquery.html#size">TQSqlQuery::size</a>() will return -1
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<li><tt>TQSqlDriver::BLOB</tt> - whether the driver supports Binary Large Object fields
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<li><tt>TQSqlDriver::Unicode</tt> - whether the driver supports Unicode strings if the
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database server does
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<li><tt>TQSqlDriver::PreparedQueries</tt> - whether the driver supports prepared query execution
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<li><tt>TQSqlDriver::NamedPlaceholders</tt> - whether the driver supports usage of named placeholders
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<li><tt>TQSqlDriver::PositionalPlaceholders</tt> - whether the driver supports usage of positional placeholders
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</ul><p> More information about supported features can be found in the
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<a href="sql-driver.html">TQt SQL driver</a> documentation.
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<p> <p>See also <a href="#hasFeature">hasFeature</a>().
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQSqlDriver"></a>TQSqlDriver::TQSqlDriver ( <a href="ntqobject.html">TQObject</a> * parent = 0, const char * name = 0 )
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</h3>
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Default constructor. Creates a new driver with parent <em>parent</em>,
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called <em>name</em>.
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<p>
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<h3 class=fn><a name="~TQSqlDriver"></a>TQSqlDriver::~TQSqlDriver ()
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</h3>
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Destroys the object and frees any allocated resources.
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<h3 class=fn>bool <a name="beginTransaction"></a>TQSqlDriver::beginTransaction ()<tt> [virtual]</tt>
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</h3>
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Protected function which derived classes can reimplement to begin
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a transaction. If successful, return TRUE, otherwise return FALSE.
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The default implementation returns FALSE.
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<p> <p>See also <a href="#commitTransaction">commitTransaction</a>() and <a href="#rollbackTransaction">rollbackTransaction</a>().
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<h3 class=fn>void <a name="close"></a>TQSqlDriver::close ()<tt> [pure virtual]</tt>
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</h3>
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<p> Derived classes must reimplement this abstract virtual function in
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order to close the database connection. Return TRUE on success,
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FALSE on failure.
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<p> <p>See also <a href="#setOpen">setOpen</a>().
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<p>
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<h3 class=fn>bool <a name="commitTransaction"></a>TQSqlDriver::commitTransaction ()<tt> [virtual]</tt>
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</h3>
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Protected function which derived classes can reimplement to commit
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a transaction. If successful, return TRUE, otherwise return FALSE.
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The default implementation returns FALSE.
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<p> <p>See also <a href="#beginTransaction">beginTransaction</a>() and <a href="#rollbackTransaction">rollbackTransaction</a>().
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<h3 class=fn><a href="ntqsqlquery.html">TQSqlQuery</a> <a name="createQuery"></a>TQSqlDriver::createQuery () const<tt> [pure virtual]</tt>
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</h3>
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<p> Creates an empty SQL result on the database. Derived classes must
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reimplement this function and return a <a href="ntqsqlquery.html">TQSqlQuery</a> object
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appropriate for their database to the caller.
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<p>
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="formatValue"></a>TQSqlDriver::formatValue ( const <a href="ntqsqlfield.html">TQSqlField</a> * field, bool trimStrings = FALSE ) const<tt> [virtual]</tt>
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</h3>
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Returns a string representation of the <em>field</em> value for the
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database. This is used, for example, when constructing INSERT and
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UPDATE statements.
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<p> The default implementation returns the value formatted as a string
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according to the following rules:
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<p> <ul>
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<p> <li> If <em>field</em> is NULL, <a href="#nullText">nullText</a>() is returned.
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<p> <li> If <em>field</em> is character data, the value is returned enclosed
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in single quotation marks, which is appropriate for many SQL
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databases. Any embedded single-quote characters are escaped
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(replaced with two single-quote characters). If <em>trimStrings</em> is
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TRUE (the default is FALSE), all trailing whitespace is trimmed
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from the field.
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<p> <li> If <em>field</em> is date/time data, the value is formatted in ISO
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format and enclosed in single quotation marks. If the date/time
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data is invalid, nullText() is returned.
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<p> <li> If <em>field</em> is bytearray data, and the driver can edit binary
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fields, the value is formatted as a hexadecimal string.
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<p> <li> For any other field type toString() will be called on its value
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and the result returned.
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<p> </ul>
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<p> <p>See also <a href="ntqvariant.html#toString">TQVariant::toString</a>().
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<p>
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<h3 class=fn>bool <a name="hasFeature"></a>TQSqlDriver::hasFeature ( <a href="ntqsqldriver.html#DriverFeature-enum">DriverFeature</a> f ) const<tt> [pure virtual]</tt>
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</h3>
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<p> Returns TRUE if the driver supports feature <em>f</em>; otherwise
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returns FALSE.
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<p> Note that some databases need to be <a href="#open">open</a>() before this can be
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determined.
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<p> <p>See also <a href="#DriverFeature-enum">DriverFeature</a>.
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<h3 class=fn>bool <a name="isOpen"></a>TQSqlDriver::isOpen () const
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</h3>
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Returns TRUE if the database connection is open; otherwise returns
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FALSE.
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<h3 class=fn>bool <a name="isOpenError"></a>TQSqlDriver::isOpenError () const
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</h3>
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Returns TRUE if the there was an error opening the database
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connection; otherwise returns FALSE.
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<h3 class=fn><a href="ntqsqlerror.html">TQSqlError</a> <a name="lastError"></a>TQSqlDriver::lastError () const
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</h3>
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Returns a <a href="ntqsqlerror.html">TQSqlError</a> object which contains information about the
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last error that occurred on the database.
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="nullText"></a>TQSqlDriver::nullText () const<tt> [virtual]</tt>
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</h3>
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Returns a string representation of the NULL value for the
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database. This is used, for example, when constructing INSERT and
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UPDATE statements. The default implementation returns the string
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"NULL".
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<h3 class=fn>bool <a name="open"></a>TQSqlDriver::open ( const <a href="ntqstring.html">TQString</a> & db, const <a href="ntqstring.html">TQString</a> & user = TQString::null, const <a href="ntqstring.html">TQString</a> & password = TQString::null, const <a href="ntqstring.html">TQString</a> & host = TQString::null, int port = -1 )<tt> [pure virtual]</tt>
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</h3>
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<p> Derived classes must reimplement this abstract virtual function in
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order to open a database connection on database <em>db</em>, using user
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name <em>user</em>, password <em>password</em>, host <em>host</em> and port <em>port</em>.
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<p> The function <em>must</em> return TRUE on success and FALSE on failure.
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<p> <p>See also <a href="#setOpen">setOpen</a>().
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<p>
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<h3 class=fn>bool <a name="open-2"></a>TQSqlDriver::open ( const <a href="ntqstring.html">TQString</a> & db, const <a href="ntqstring.html">TQString</a> & user, const <a href="ntqstring.html">TQString</a> & password, const <a href="ntqstring.html">TQString</a> & host, int port, const <a href="ntqstring.html">TQString</a> & connOpts )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Open a database connection on database <em>db</em>, using user name <em>user</em>, password <em>password</em>, host <em>host</em>, port <em>port</em> and
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connection options <em>connOpts</em>.
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<p> Returns TRUE on success and FALSE on failure.
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<p> <p>See also <a href="#setOpen">setOpen</a>().
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<h3 class=fn><a href="ntqsqlindex.html">TQSqlIndex</a> <a name="primaryIndex"></a>TQSqlDriver::primaryIndex ( const <a href="ntqstring.html">TQString</a> & tableName ) const<tt> [virtual]</tt>
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</h3>
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Returns the primary index for table <em>tableName</em>. Returns an empty
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<a href="ntqsqlindex.html">TQSqlIndex</a> if the table doesn't have a primary index. The default
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implementation returns an empty index.
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<h3 class=fn><a href="ntqsqlrecord.html">TQSqlRecord</a> <a name="record"></a>TQSqlDriver::record ( const <a href="ntqstring.html">TQString</a> & tableName ) const<tt> [virtual]</tt>
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</h3>
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Returns a <a href="ntqsqlrecord.html">TQSqlRecord</a> populated with the names of the fields in
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table <em>tableName</em>. If no such table exists, an empty record is
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returned. The default implementation returns an empty record.
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<h3 class=fn><a href="ntqsqlrecord.html">TQSqlRecord</a> <a name="record-2"></a>TQSqlDriver::record ( const <a href="ntqsqlquery.html">TQSqlQuery</a> & query ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns a <a href="ntqsqlrecord.html">TQSqlRecord</a> populated with the names of the fields in the
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SQL <em>query</em>. The default implementation returns an empty record.
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<h3 class=fn><a href="qsqlrecordinfo.html">TQSqlRecordInfo</a> <a name="recordInfo"></a>TQSqlDriver::recordInfo ( const <a href="ntqstring.html">TQString</a> & tablename ) const<tt> [virtual]</tt>
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</h3>
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Returns a <a href="qsqlrecordinfo.html">TQSqlRecordInfo</a> object with meta data about the table <em>tablename</em>.
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<h3 class=fn><a href="qsqlrecordinfo.html">TQSqlRecordInfo</a> <a name="recordInfo-2"></a>TQSqlDriver::recordInfo ( const <a href="ntqsqlquery.html">TQSqlQuery</a> & query ) const<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns a <a href="qsqlrecordinfo.html">TQSqlRecordInfo</a> object with meta data for the <a href="ntqsqlquery.html">TQSqlQuery</a>
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<em>query</em>. Note that this overloaded function may return less
|
||
|
|
information than the <a href="#recordInfo">recordInfo</a>() function which takes the name of
|
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|
|
a table as parameter.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="rollbackTransaction"></a>TQSqlDriver::rollbackTransaction ()<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Protected function which derived classes can reimplement to
|
||
|
|
rollback a transaction. If successful, return TRUE, otherwise
|
||
|
|
return FALSE. The default implementation returns FALSE.
|
||
|
|
<p> <p>See also <a href="#beginTransaction">beginTransaction</a>() and <a href="#commitTransaction">commitTransaction</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="setLastError"></a>TQSqlDriver::setLastError ( const <a href="ntqsqlerror.html">TQSqlError</a> & e )<tt> [virtual protected]</tt>
|
||
|
13 years ago
|
</h3>
|
||
|
|
Protected function which allows derived classes to set the value
|
||
|
|
of the last error, <em>e</em>, that occurred on the database.
|
||
|
|
<p> <p>See also <a href="#lastError">lastError</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setOpen"></a>TQSqlDriver::setOpen ( bool o )<tt> [virtual protected]</tt>
|
||
|
|
</h3>
|
||
|
|
Protected function which sets the open state of the database to <em>o</em>. Derived classes can use this function to report the status of
|
||
|
|
<a href="#open">open</a>().
|
||
|
|
<p> <p>See also <a href="#open">open</a>() and <a href="#setOpenError">setOpenError</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="setOpenError"></a>TQSqlDriver::setOpenError ( bool e )<tt> [virtual protected]</tt>
|
||
|
|
</h3>
|
||
|
|
Protected function which sets the open error state of the database
|
||
|
|
to <em>e</em>. Derived classes can use this function to report the
|
||
|
|
status of <a href="#open">open</a>(). Note that if <em>e</em> is TRUE the open state of the
|
||
|
|
database is set to closed (i.e. <a href="#isOpen">isOpen</a>() returns FALSE).
|
||
|
|
<p> <p>See also <a href="#open">open</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="tables"></a>TQSqlDriver::tables ( const <a href="ntqstring.html">TQString</a> & tableType ) const<tt> [virtual]</tt>
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns a list of tables in the database. The default
|
||
|
|
implementation returns an empty list.
|
||
|
|
<p> The <em>tableType</em> argument describes what types of tables
|
||
|
|
should be returned. Due to binary compatibility, the string
|
||
|
|
contains the value of the enum TQSql::TableTypes as text.
|
||
|
|
An empty string should be treated as TQSql::Tables for
|
||
|
|
downward compatibility.
|
||
|
13 years ago
|
<p> <p>See also <a href="ntqsql.html#TableType-enum">TQSql::TableType</a>.
|
||
|
13 years ago
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">TQt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|