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227 lines
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227 lines
13 KiB
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<title>TQSqlFieldInfo Class</title>
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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>TQSqlFieldInfo Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1>
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<p>The TQSqlFieldInfo class stores meta data associated with a SQL field.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="tqsqlfield-h.html">tqsqlfield.h</a>></tt>
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<p><a href="tqsqlfieldinfo-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><a href="#TQSqlFieldInfo"><b>TQSqlFieldInfo</b></a> ( const TQString & name = TQString::null, TQVariant::Type typ = TQVariant::Invalid, int required = -1, int len = -1, int prec = -1, const TQVariant & defValue = TQVariant ( ), int typeID = 0, bool generated = TRUE, bool trim = FALSE, bool calculated = FALSE )</li>
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<li class=fn><a href="#TQSqlFieldInfo-2"><b>TQSqlFieldInfo</b></a> ( const TQSqlFieldInfo & other )</li>
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<li class=fn><a href="#TQSqlFieldInfo-3"><b>TQSqlFieldInfo</b></a> ( const TQSqlField & other, bool generated = TRUE )</li>
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<li class=fn>virtual <a href="#~TQSqlFieldInfo"><b>~TQSqlFieldInfo</b></a> ()</li>
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<li class=fn>TQSqlFieldInfo & <a href="#operator-eq"><b>operator=</b></a> ( const TQSqlFieldInfo & other )</li>
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<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const TQSqlFieldInfo & f ) const</li>
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<li class=fn>TQSqlField <a href="#toField"><b>toField</b></a> () const</li>
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<li class=fn>int <a href="#isRequired"><b>isRequired</b></a> () const</li>
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<li class=fn>TQVariant::Type <a href="#type"><b>type</b></a> () const</li>
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<li class=fn>int <a href="#length"><b>length</b></a> () const</li>
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<li class=fn>int <a href="#precision"><b>precision</b></a> () const</li>
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<li class=fn>TQVariant <a href="#defaultValue"><b>defaultValue</b></a> () const</li>
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<li class=fn>TQString <a href="#name"><b>name</b></a> () const</li>
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<li class=fn>int <a href="#typeID"><b>typeID</b></a> () const</li>
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<li class=fn>bool <a href="#isGenerated"><b>isGenerated</b></a> () const</li>
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<li class=fn>bool <a href="#isTrim"><b>isTrim</b></a> () const</li>
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<li class=fn>bool <a href="#isCalculated"><b>isCalculated</b></a> () const</li>
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<li class=fn>virtual void <a href="#setTrim"><b>setTrim</b></a> ( bool trim )</li>
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<li class=fn>virtual void <a href="#setGenerated"><b>setGenerated</b></a> ( bool gen )</li>
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<li class=fn>virtual void <a href="#setCalculated"><b>setCalculated</b></a> ( bool calc )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQSqlFieldInfo class stores meta data associated with a SQL field.
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<p>
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<p> TQSqlFieldInfo objects only store meta data; field values are
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stored in <a href="tqsqlfield.html">TQSqlField</a> objects.
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<p> All values must be set in the constructor, and may be retrieved
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using <a href="#isRequired">isRequired</a>(), <a href="#type">type</a>(), <a href="#length">length</a>(), <a href="#precision">precision</a>(), <a href="#defaultValue">defaultValue</a>(),
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<a href="#name">name</a>(), <a href="#isGenerated">isGenerated</a>() and <a href="#typeID">typeID</a>().
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<p>See also <a href="database.html">Database Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQSqlFieldInfo"></a>TQSqlFieldInfo::TQSqlFieldInfo ( const <a href="tqstring.html">TQString</a> & name = TQString::null, <a href="tqvariant.html#Type-enum">TQVariant::Type</a> typ = TQVariant::Invalid, int required = -1, int len = -1, int prec = -1, const <a href="tqvariant.html">TQVariant</a> & defValue = TQVariant ( ), int typeID = 0, bool generated = TRUE, bool trim = FALSE, bool calculated = FALSE )
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</h3>
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Constructs a TQSqlFieldInfo with the following parameters:
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<center><table cellpadding="4" cellspacing="2" border="0">
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<tr bgcolor="#f0f0f0"> <td valign="top"><em>name</em> <td valign="top">the name of the field.
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<tr bgcolor="#d0d0d0"> <td valign="top"><em>typ</em> <td valign="top">the field's type in a <a href="tqvariant.html">TQVariant</a>.
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<tr bgcolor="#f0f0f0"> <td valign="top"><em>required</em> <td valign="top">greater than 0 if the field is required, 0
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if its value can be NULL and less than 0 if it cannot be
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determined whether the field is required or not.
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<tr bgcolor="#d0d0d0"> <td valign="top"><em>len</em> <td valign="top">the length of the field. Note that for
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non-character types some databases return either the length in
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bytes or the number of digits. -1 signifies that the length cannot
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be determined.
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<tr bgcolor="#f0f0f0"> <td valign="top"><em>prec</em> <td valign="top">the precision of the field, or -1 if the field
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has no precision or it cannot be determined.
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<tr bgcolor="#d0d0d0"> <td valign="top"><em>defValue</em> <td valign="top">the default value that is inserted into
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the table if none is specified by the user. TQVariant() if there is
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no default value or it cannot be determined.
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<tr bgcolor="#f0f0f0"> <td valign="top"><em>typeID</em> <td valign="top">the internal typeID of the database system
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(only useful for low-level programming). 0 if unknown.
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<tr bgcolor="#d0d0d0"> <td valign="top"><em>generated</em> <td valign="top">TRUE indicates that this field should be
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included in auto-generated SQL statments, e.g. in <a href="tqsqlcursor.html">TQSqlCursor</a>.
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<tr bgcolor="#f0f0f0"> <td valign="top"><em>trim</em> <td valign="top">TRUE indicates that widgets should remove
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trailing whitespace from character fields. This does not affect
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the field value but only its representation inside widgets.
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<tr bgcolor="#d0d0d0"> <td valign="top"><em>calculated</em> <td valign="top">TRUE indicates that the value of this
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field is calculated. The value of calculated fields can by
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modified by subclassing TQSqlCursor and overriding
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<a href="tqsqlcursor.html#calculateField">TQSqlCursor::calculateField</a>().
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</table></center>
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<h3 class=fn><a name="TQSqlFieldInfo-2"></a>TQSqlFieldInfo::TQSqlFieldInfo ( const <a href="tqsqlfieldinfo.html">TQSqlFieldInfo</a> & other )
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</h3>
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Constructs a copy of <em>other</em>.
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<h3 class=fn><a name="TQSqlFieldInfo-3"></a>TQSqlFieldInfo::TQSqlFieldInfo ( const <a href="tqsqlfield.html">TQSqlField</a> & other, bool generated = TRUE )
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</h3>
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Creates a TQSqlFieldInfo object with the type and the name of the
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<a href="tqsqlfield.html">TQSqlField</a> <em>other</em>. If <em>generated</em> is TRUE this field will be
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included in auto-generated SQL statments, e.g. in <a href="tqsqlcursor.html">TQSqlCursor</a>.
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<h3 class=fn><a name="~TQSqlFieldInfo"></a>TQSqlFieldInfo::~TQSqlFieldInfo ()<tt> [virtual]</tt>
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</h3>
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Destroys the object and frees any allocated resources.
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<h3 class=fn><a href="tqvariant.html">TQVariant</a> <a name="defaultValue"></a>TQSqlFieldInfo::defaultValue () const
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</h3>
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Returns the field's default value or an empty <a href="tqvariant.html">TQVariant</a> if the
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field has no default value or the value couldn't be determined.
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The default value is the value inserted in the database when it
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is not explicitly specified by the user.
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<h3 class=fn>bool <a name="isCalculated"></a>TQSqlFieldInfo::isCalculated () const
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</h3>
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Returns TRUE if the field is calculated; otherwise returns FALSE.
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<p> <p>See also <a href="#setCalculated">setCalculated</a>().
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<h3 class=fn>bool <a name="isGenerated"></a>TQSqlFieldInfo::isGenerated () const
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</h3>
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Returns TRUE if the field should be included in auto-generated
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SQL statments, e.g. in <a href="tqsqlcursor.html">TQSqlCursor</a>; otherwise returns FALSE.
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<p> <p>See also <a href="#setGenerated">setGenerated</a>().
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<h3 class=fn>int <a name="isRequired"></a>TQSqlFieldInfo::isRequired () const
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</h3>
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Returns a value greater than 0 if the field is required (NULL
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values are not allowed), 0 if it isn't required (NULL values are
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allowed) or less than 0 if it cannot be determined whether the
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field is required or not.
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<h3 class=fn>bool <a name="isTrim"></a>TQSqlFieldInfo::isTrim () const
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</h3>
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Returns TRUE if trailing whitespace should be removed from
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character fields; otherwise returns FALSE.
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<p> <p>See also <a href="#setTrim">setTrim</a>().
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<h3 class=fn>int <a name="length"></a>TQSqlFieldInfo::length () const
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</h3>
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Returns the field's length. For fields storing text the return
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value is the maximum number of characters the field can hold. For
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non-character fields some database systems return the number of
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bytes needed or the number of digits allowed. If the length cannot
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be determined -1 is returned.
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<h3 class=fn><a href="tqstring.html">TQString</a> <a name="name"></a>TQSqlFieldInfo::name () const
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</h3>
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Returns the name of the field in the SQL table.
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<p>Examples: <a href="sql.html#x2260">sql/overview/subclass3/main.cpp</a> and <a href="sql.html#x2264">sql/overview/subclass4/main.cpp</a>.
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<h3 class=fn><a href="tqsqlfieldinfo.html">TQSqlFieldInfo</a> & <a name="operator-eq"></a>TQSqlFieldInfo::operator= ( const <a href="tqsqlfieldinfo.html">TQSqlFieldInfo</a> & other )
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</h3>
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Assigns <em>other</em> to this field info and returns a reference to it.
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<h3 class=fn>bool <a name="operator-eq-eq"></a>TQSqlFieldInfo::operator== ( const <a href="tqsqlfieldinfo.html">TQSqlFieldInfo</a> & f ) const
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</h3>
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Returns TRUE if this fieldinfo is equal to <em>f</em>; otherwise returns
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FALSE.
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<p> Two field infos are considered equal if all their attributes
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match.
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<h3 class=fn>int <a name="precision"></a>TQSqlFieldInfo::precision () const
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</h3>
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Returns the field's precision or -1 if the field has no precision
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or it cannot be determined.
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<h3 class=fn>void <a name="setCalculated"></a>TQSqlFieldInfo::setCalculated ( bool calc )<tt> [virtual]</tt>
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</h3>
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<em>calc</em> set to TRUE indicates that this field is a calculated
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field. The value of calculated fields can by modified by subclassing
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<a href="tqsqlcursor.html">TQSqlCursor</a> and overriding <a href="tqsqlcursor.html#calculateField">TQSqlCursor::calculateField</a>().
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<p> <p>See also <a href="#isCalculated">isCalculated</a>().
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<h3 class=fn>void <a name="setGenerated"></a>TQSqlFieldInfo::setGenerated ( bool gen )<tt> [virtual]</tt>
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</h3>
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<em>gen</em> set to FALSE indicates that this field should not appear
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in auto-generated SQL statements (for example in <a href="tqsqlcursor.html">TQSqlCursor</a>).
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<p> <p>See also <a href="#isGenerated">isGenerated</a>().
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<h3 class=fn>void <a name="setTrim"></a>TQSqlFieldInfo::setTrim ( bool trim )<tt> [virtual]</tt>
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</h3>
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If <em>trim</em> is TRUE widgets should remove trailing whitespace from
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character fields. This does not affect the field value but only
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its representation inside widgets.
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<p> <p>See also <a href="#isTrim">isTrim</a>().
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<h3 class=fn><a href="tqsqlfield.html">TQSqlField</a> <a name="toField"></a>TQSqlFieldInfo::toField () const
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</h3>
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Returns an empty <a href="tqsqlfield.html">TQSqlField</a> based on the information in this
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TQSqlFieldInfo.
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<h3 class=fn><a href="tqvariant.html#Type-enum">TQVariant::Type</a> <a name="type"></a>TQSqlFieldInfo::type () const
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</h3>
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Returns the field's type or TQVariant::Invalid if the type is
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unknown.
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<h3 class=fn>int <a name="typeID"></a>TQSqlFieldInfo::typeID () const
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</h3>
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Returns the internal type identifier as returned from the database
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system. The return value is 0 if the type is unknown.
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<p> <b>Warning:</b> This information is only useful for low-level database
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programming and is <em>not</em> database independent.
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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