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| 31 | </td>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QSqlDriver Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1>
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| 33 |
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| 34 | <p>The QSqlDriver class is an abstract base class for accessing
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| 35 | SQL databases.
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| 36 | <a href="#details">More...</a>
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| 37 | <p><tt>#include <<a href="qsqldriver-h.html">qsqldriver.h</a>></tt>
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| 38 | <p>Inherits <a href="qobject.html">QObject</a>.
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| 39 | <p><a href="qsqldriver-members.html">List of all member functions.</a>
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| 40 | <h2>Public Members</h2>
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| 41 | <ul>
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| 42 | <li class=fn>enum <a href="#DriverFeature-enum"><b>DriverFeature</b></a> { Transactions, QuerySize, BLOB, Unicode, PreparedQueries, NamedPlaceholders, PositionalPlaceholders }</li>
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| 43 | <li class=fn><a href="#QSqlDriver"><b>QSqlDriver</b></a> ( QObject * parent = 0, const char * name = 0 )</li>
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| 44 | <li class=fn><a href="#~QSqlDriver"><b>~QSqlDriver</b></a> ()</li>
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| 45 | <li class=fn>bool <a href="#isOpen"><b>isOpen</b></a> () const</li>
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| 46 | <li class=fn>bool <a href="#isOpenError"><b>isOpenError</b></a> () const</li>
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| 47 | <li class=fn>virtual bool <a href="#beginTransaction"><b>beginTransaction</b></a> ()</li>
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| 48 | <li class=fn>virtual bool <a href="#commitTransaction"><b>commitTransaction</b></a> ()</li>
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| 49 | <li class=fn>virtual bool <a href="#rollbackTransaction"><b>rollbackTransaction</b></a> ()</li>
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| 50 | <li class=fn>virtual QStringList <a href="#tables"><b>tables</b></a> ( const QString & tableType ) const</li>
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| 51 | <li class=fn>virtual QSqlIndex <a href="#primaryIndex"><b>primaryIndex</b></a> ( const QString & tableName ) const</li>
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| 52 | <li class=fn>virtual QSqlRecord <a href="#record"><b>record</b></a> ( const QString & tableName ) const</li>
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| 53 | <li class=fn>virtual QSqlRecord <a href="#record-2"><b>record</b></a> ( const QSqlQuery & query ) const</li>
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| 54 | <li class=fn>virtual QSqlRecordInfo <a href="#recordInfo"><b>recordInfo</b></a> ( const QString & tablename ) const</li>
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| 55 | <li class=fn>virtual QSqlRecordInfo <a href="#recordInfo-2"><b>recordInfo</b></a> ( const QSqlQuery & query ) const</li>
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| 56 | <li class=fn>virtual QString <a href="#nullText"><b>nullText</b></a> () const</li>
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| 57 | <li class=fn>virtual QString <a href="#formatValue"><b>formatValue</b></a> ( const QSqlField * field, bool trimStrings = FALSE ) const</li>
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| 58 | <li class=fn>QSqlError <a href="#lastError"><b>lastError</b></a> () const</li>
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| 59 | <li class=fn>virtual bool <a href="#hasFeature"><b>hasFeature</b></a> ( DriverFeature f ) const = 0</li>
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| 60 | <li class=fn>virtual bool <a href="#open"><b>open</b></a> ( const QString & db, const QString & user = QString::null, const QString & password = QString::null, const QString & host = QString::null, int port = -1 ) = 0</li>
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| 61 | <li class=fn>virtual void <a href="#close"><b>close</b></a> () = 0</li>
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| 62 | <li class=fn>virtual QSqlQuery <a href="#createQuery"><b>createQuery</b></a> () const = 0</li>
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| 63 | <li class=fn>bool <a href="#open-2"><b>open</b></a> ( const QString & db, const QString & user, const QString & password, const QString & host, int port, const QString & connOpts )</li>
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| 64 | </ul>
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| 65 | <h2>Protected Members</h2>
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| 66 | <ul>
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| 67 | <li class=fn>virtual void <a href="#setOpen"><b>setOpen</b></a> ( bool o )</li>
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| 68 | <li class=fn>virtual void <a href="#setOpenError"><b>setOpenError</b></a> ( bool e )</li>
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| 69 | <li class=fn>virtual void <a href="#setLastError"><b>setLastError</b></a> ( const QSqlError & e )</li>
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| 70 | </ul>
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| 71 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 72 |
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| 73 |
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| 74 | The QSqlDriver class is an abstract base class for accessing
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| 75 | SQL databases.
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| 76 | <p>
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| 77 |
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| 78 | <p> This class should not be used directly. Use <a href="qsqldatabase.html">QSqlDatabase</a> instead.
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| 79 | <p>See also <a href="database.html">Database Classes</a>.
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| 80 |
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| 81 | <hr><h2>Member Type Documentation</h2>
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| 82 | <h3 class=fn><a name="DriverFeature-enum"></a>QSqlDriver::DriverFeature</h3>
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| 83 |
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| 84 | <p> This enum contains a list of features a driver may support. Use
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| 85 | <a href="#hasFeature">hasFeature</a>() to query whether a feature is supported or not.
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| 86 | <ul>
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| 87 | <li><tt>QSqlDriver::Transactions</tt> - whether the driver supports SQL transactions
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| 88 | <li><tt>QSqlDriver::QuerySize</tt> - whether the database is capable of reporting the size
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| 89 | of a query. Note that some databases do not support returning the size
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| 90 | (i.e. number of rows returned) of a query, in which case
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| 91 | <a href="qsqlquery.html#size">QSqlQuery::size</a>() will return -1
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| 92 | <li><tt>QSqlDriver::BLOB</tt> - whether the driver supports Binary Large Object fields
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| 93 | <li><tt>QSqlDriver::Unicode</tt> - whether the driver supports Unicode strings if the
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| 94 | database server does
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| 95 | <li><tt>QSqlDriver::PreparedQueries</tt> - whether the driver supports prepared query execution
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| 96 | <li><tt>QSqlDriver::NamedPlaceholders</tt> - whether the driver supports usage of named placeholders
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| 97 | <li><tt>QSqlDriver::PositionalPlaceholders</tt> - whether the driver supports usage of positional placeholders
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| 98 | </ul><p> More information about supported features can be found in the
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| 99 | <a href="sql-driver.html">Qt SQL driver</a> documentation.
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| 100 | <p> <p>See also <a href="#hasFeature">hasFeature</a>().
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| 101 |
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| 102 | <hr><h2>Member Function Documentation</h2>
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| 103 | <h3 class=fn><a name="QSqlDriver"></a>QSqlDriver::QSqlDriver ( <a href="qobject.html">QObject</a> * parent = 0, const char * name = 0 )
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| 104 | </h3>
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| 105 | Default constructor. Creates a new driver with parent <em>parent</em>,
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| 106 | called <em>name</em>.
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| 107 | <p>
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| 108 | <h3 class=fn><a name="~QSqlDriver"></a>QSqlDriver::~QSqlDriver ()
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| 109 | </h3>
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| 110 | Destroys the object and frees any allocated resources.
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| 111 |
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| 112 | <h3 class=fn>bool <a name="beginTransaction"></a>QSqlDriver::beginTransaction ()<tt> [virtual]</tt>
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| 113 | </h3>
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| 114 | Protected function which derived classes can reimplement to begin
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| 115 | a transaction. If successful, return TRUE, otherwise return FALSE.
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| 116 | The default implementation returns FALSE.
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| 117 | <p> <p>See also <a href="#commitTransaction">commitTransaction</a>() and <a href="#rollbackTransaction">rollbackTransaction</a>().
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| 118 |
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| 119 | <h3 class=fn>void <a name="close"></a>QSqlDriver::close ()<tt> [pure virtual]</tt>
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| 120 | </h3>
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| 121 |
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| 122 | <p> Derived classes must reimplement this abstract virtual function in
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| 123 | order to close the database connection. Return TRUE on success,
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| 124 | FALSE on failure.
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| 125 | <p> <p>See also <a href="#setOpen">setOpen</a>().
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| 126 |
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| 127 | <p>
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| 128 | <h3 class=fn>bool <a name="commitTransaction"></a>QSqlDriver::commitTransaction ()<tt> [virtual]</tt>
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| 129 | </h3>
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| 130 | Protected function which derived classes can reimplement to commit
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| 131 | a transaction. If successful, return TRUE, otherwise return FALSE.
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| 132 | The default implementation returns FALSE.
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| 133 | <p> <p>See also <a href="#beginTransaction">beginTransaction</a>() and <a href="#rollbackTransaction">rollbackTransaction</a>().
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| 134 |
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| 135 | <h3 class=fn><a href="qsqlquery.html">QSqlQuery</a> <a name="createQuery"></a>QSqlDriver::createQuery () const<tt> [pure virtual]</tt>
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| 136 | </h3>
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| 137 |
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| 138 | <p> Creates an empty SQL result on the database. Derived classes must
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| 139 | reimplement this function and return a <a href="qsqlquery.html">QSqlQuery</a> object
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| 140 | appropriate for their database to the caller.
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| 141 | <p>
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| 142 | <h3 class=fn><a href="qstring.html">QString</a> <a name="formatValue"></a>QSqlDriver::formatValue ( const <a href="qsqlfield.html">QSqlField</a> * field, bool trimStrings = FALSE ) const<tt> [virtual]</tt>
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| 143 | </h3>
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| 144 | Returns a string representation of the <em>field</em> value for the
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| 145 | database. This is used, for example, when constructing INSERT and
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| 146 | UPDATE statements.
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| 147 | <p> The default implementation returns the value formatted as a string
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| 148 | according to the following rules:
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| 149 | <p> <ul>
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| 150 | <p> <li> If <em>field</em> is NULL, <a href="#nullText">nullText</a>() is returned.
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| 151 | <p> <li> If <em>field</em> is character data, the value is returned enclosed
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| 152 | in single quotation marks, which is appropriate for many SQL
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| 153 | databases. Any embedded single-quote characters are escaped
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| 154 | (replaced with two single-quote characters). If <em>trimStrings</em> is
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| 155 | TRUE (the default is FALSE), all trailing whitespace is trimmed
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| 156 | from the field.
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| 157 | <p> <li> If <em>field</em> is date/time data, the value is formatted in ISO
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| 158 | format and enclosed in single quotation marks. If the date/time
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| 159 | data is invalid, nullText() is returned.
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| 160 | <p> <li> If <em>field</em> is bytearray data, and the driver can edit binary
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| 161 | fields, the value is formatted as a hexadecimal string.
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| 162 | <p> <li> For any other field type toString() will be called on its value
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| 163 | and the result returned.
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| 164 | <p> </ul>
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| 165 | <p> <p>See also <a href="qvariant.html#toString">QVariant::toString</a>().
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| 166 |
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| 167 | <p>
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| 168 | <h3 class=fn>bool <a name="hasFeature"></a>QSqlDriver::hasFeature ( <a href="qsqldriver.html#DriverFeature-enum">DriverFeature</a> f ) const<tt> [pure virtual]</tt>
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| 169 | </h3>
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| 170 |
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| 171 | <p> Returns TRUE if the driver supports feature <em>f</em>; otherwise
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| 172 | returns FALSE.
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| 173 | <p> Note that some databases need to be <a href="#open">open</a>() before this can be
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| 174 | determined.
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| 175 | <p> <p>See also <a href="#DriverFeature-enum">DriverFeature</a>.
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| 176 |
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| 177 | <h3 class=fn>bool <a name="isOpen"></a>QSqlDriver::isOpen () const
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| 178 | </h3>
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| 179 | Returns TRUE if the database connection is open; otherwise returns
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| 180 | FALSE.
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| 181 |
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| 182 | <h3 class=fn>bool <a name="isOpenError"></a>QSqlDriver::isOpenError () const
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| 183 | </h3>
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| 184 | Returns TRUE if the there was an error opening the database
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| 185 | connection; otherwise returns FALSE.
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| 186 |
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| 187 | <h3 class=fn><a href="qsqlerror.html">QSqlError</a> <a name="lastError"></a>QSqlDriver::lastError () const
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| 188 | </h3>
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| 189 | Returns a <a href="qsqlerror.html">QSqlError</a> object which contains information about the
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| 190 | last error that occurred on the database.
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| 191 |
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| 192 | <h3 class=fn><a href="qstring.html">QString</a> <a name="nullText"></a>QSqlDriver::nullText () const<tt> [virtual]</tt>
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| 193 | </h3>
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| 194 | Returns a string representation of the NULL value for the
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| 195 | database. This is used, for example, when constructing INSERT and
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| 196 | UPDATE statements. The default implementation returns the string
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| 197 | "NULL".
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| 198 |
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| 199 | <h3 class=fn>bool <a name="open"></a>QSqlDriver::open ( const <a href="qstring.html">QString</a> & db, const <a href="qstring.html">QString</a> & user = QString::null, const <a href="qstring.html">QString</a> & password = QString::null, const <a href="qstring.html">QString</a> & host = QString::null, int port = -1 )<tt> [pure virtual]</tt>
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| 200 | </h3>
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| 201 |
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| 202 | <p> Derived classes must reimplement this abstract virtual function in
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| 203 | order to open a database connection on database <em>db</em>, using user
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| 204 | name <em>user</em>, password <em>password</em>, host <em>host</em> and port <em>port</em>.
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| 205 | <p> The function <em>must</em> return TRUE on success and FALSE on failure.
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| 206 | <p> <p>See also <a href="#setOpen">setOpen</a>().
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| 207 |
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| 208 | <p>
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| 209 | <h3 class=fn>bool <a name="open-2"></a>QSqlDriver::open ( const <a href="qstring.html">QString</a> & db, const <a href="qstring.html">QString</a> & user, const <a href="qstring.html">QString</a> & password, const <a href="qstring.html">QString</a> & host, int port, const <a href="qstring.html">QString</a> & connOpts )
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| 210 | </h3>
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| 211 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 212 | <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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| 213 | connection options <em>connOpts</em>.
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| 214 | <p> Returns TRUE on success and FALSE on failure.
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| 215 | <p> <p>See also <a href="#setOpen">setOpen</a>().
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| 216 |
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| 217 | <h3 class=fn><a href="qsqlindex.html">QSqlIndex</a> <a name="primaryIndex"></a>QSqlDriver::primaryIndex ( const <a href="qstring.html">QString</a> & tableName ) const<tt> [virtual]</tt>
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| 218 | </h3>
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| 219 | Returns the primary index for table <em>tableName</em>. Returns an empty
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| 220 | <a href="qsqlindex.html">QSqlIndex</a> if the table doesn't have a primary index. The default
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| 221 | implementation returns an empty index.
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| 222 |
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| 223 | <h3 class=fn><a href="qsqlrecord.html">QSqlRecord</a> <a name="record"></a>QSqlDriver::record ( const <a href="qstring.html">QString</a> & tableName ) const<tt> [virtual]</tt>
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| 224 | </h3>
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| 225 | Returns a <a href="qsqlrecord.html">QSqlRecord</a> populated with the names of the fields in
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| 226 | table <em>tableName</em>. If no such table exists, an empty record is
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| 227 | returned. The default implementation returns an empty record.
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| 228 |
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| 229 | <h3 class=fn><a href="qsqlrecord.html">QSqlRecord</a> <a name="record-2"></a>QSqlDriver::record ( const <a href="qsqlquery.html">QSqlQuery</a> & query ) const<tt> [virtual]</tt>
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| 230 | </h3>
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| 231 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 232 | <p> Returns a <a href="qsqlrecord.html">QSqlRecord</a> populated with the names of the fields in the
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| 233 | SQL <em>query</em>. The default implementation returns an empty record.
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| 234 |
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| 235 | <h3 class=fn><a href="qsqlrecordinfo.html">QSqlRecordInfo</a> <a name="recordInfo"></a>QSqlDriver::recordInfo ( const <a href="qstring.html">QString</a> & tablename ) const<tt> [virtual]</tt>
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| 236 | </h3>
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| 237 | Returns a <a href="qsqlrecordinfo.html">QSqlRecordInfo</a> object with meta data about the table <em>tablename</em>.
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| 238 |
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| 239 | <h3 class=fn><a href="qsqlrecordinfo.html">QSqlRecordInfo</a> <a name="recordInfo-2"></a>QSqlDriver::recordInfo ( const <a href="qsqlquery.html">QSqlQuery</a> & query ) const<tt> [virtual]</tt>
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| 240 | </h3>
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| 241 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 242 | <p> Returns a <a href="qsqlrecordinfo.html">QSqlRecordInfo</a> object with meta data for the <a href="qsqlquery.html">QSqlQuery</a>
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| 243 | <em>query</em>. Note that this overloaded function may return less
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| 244 | information than the <a href="#recordInfo">recordInfo</a>() function which takes the name of
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| 245 | a table as parameter.
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| 246 |
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| 247 | <h3 class=fn>bool <a name="rollbackTransaction"></a>QSqlDriver::rollbackTransaction ()<tt> [virtual]</tt>
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| 248 | </h3>
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| 249 | Protected function which derived classes can reimplement to
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| 250 | rollback a transaction. If successful, return TRUE, otherwise
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| 251 | return FALSE. The default implementation returns FALSE.
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| 252 | <p> <p>See also <a href="#beginTransaction">beginTransaction</a>() and <a href="#commitTransaction">commitTransaction</a>().
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| 253 |
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| 254 | <h3 class=fn>void <a name="setLastError"></a>QSqlDriver::setLastError ( const <a href="qsqlerror.html">QSqlError</a> & e )<tt> [virtual protected]</tt>
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| 255 | </h3>
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| 256 | Protected function which allows derived classes to set the value
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| 257 | of the last error, <em>e</em>, that occurred on the database.
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| 258 | <p> <p>See also <a href="#lastError">lastError</a>().
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| 259 |
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| 260 | <h3 class=fn>void <a name="setOpen"></a>QSqlDriver::setOpen ( bool o )<tt> [virtual protected]</tt>
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| 261 | </h3>
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| 262 | 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
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| 263 | <a href="#open">open</a>().
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| 264 | <p> <p>See also <a href="#open">open</a>() and <a href="#setOpenError">setOpenError</a>().
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| 265 |
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| 266 | <h3 class=fn>void <a name="setOpenError"></a>QSqlDriver::setOpenError ( bool e )<tt> [virtual protected]</tt>
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| 267 | </h3>
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| 268 | Protected function which sets the open error state of the database
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| 269 | to <em>e</em>. Derived classes can use this function to report the
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| 270 | status of <a href="#open">open</a>(). Note that if <em>e</em> is TRUE the open state of the
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| 271 | database is set to closed (i.e. <a href="#isOpen">isOpen</a>() returns FALSE).
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| 272 | <p> <p>See also <a href="#open">open</a>().
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| 273 |
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| 274 | <h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="tables"></a>QSqlDriver::tables ( const <a href="qstring.html">QString</a> & tableType ) const<tt> [virtual]</tt>
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| 275 | </h3>
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| 276 | Returns a list of tables in the database. The default
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| 277 | implementation returns an empty list.
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| 278 | <p> The <em>tableType</em> argument describes what types of tables
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| 279 | should be returned. Due to binary compatibility, the string
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| 280 | contains the value of the enum QSql::TableTypes as text.
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| 281 | An empty string should be treated as QSql::Tables for
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| 282 | downward compatibility.
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| 283 | <p> <p>See also <a href="qsql.html#TableType-enum">QSql::TableType</a>.
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| 284 |
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| 285 | <!-- eof -->
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| 286 | <hr><p>
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| 287 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 288 | Copyright © 1995-2007
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| 289 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 290 | <table width=100% cellspacing=0 border=0><tr>
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| 291 | <td>Copyright © 2007
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| 292 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 293 | <td align=right><div align=right>Qt 3.3.8</div>
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| 294 | </table></div></address></body>
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| 295 | </html>
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