1 files changed, 95 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp b/doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp
new file mode 100644
index 0000000..8194611
--- /dev/null
+++ b/doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp
@@ -0,0 +1,95 @@
+//! [0]
+// WRONG
+QSqlDatabase db = QSqlDatabase::database("sales");
+QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db);
+QSqlDatabase::removeDatabase("sales"); // will output a warning
+
+// "db" is now a dangling invalid database connection,
+// "query" contains an invalid result set
+//! [0]
+
+
+//! [1]
+{
+    QSqlDatabase db = QSqlDatabase::database("sales");
+    QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db);
+}
+// Both "db" and "query" are destroyed because they are out of scope
+QSqlDatabase::removeDatabase("sales"); // correct
+//! [1]
+
+
+//! [2]
+QSqlDatabase::registerSqlDriver("MYDRIVER",
+                                new QSqlDriverCreator<MyDatabaseDriver>);
+QSqlDatabase db = QSqlDatabase::addDatabase("MYDRIVER");
+//! [2]
+
+
+//! [3]
+...
+db = QSqlDatabase::addDatabase("QODBC");
+db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=myaccessfile.mdb");
+if (db.open()) {
+    // success!
+}
+...
+//! [3]
+
+
+//! [4]
+...
+// MySQL connection
+db.setConnectOptions("CLIENT_SSL=1;CLIENT_IGNORE_SPACE=1"); // use an SSL connection to the server
+if (!db.open()) {
+    db.setConnectOptions(); // clears the connect option string
+    ...
+}
+...
+// PostgreSQL connection
+db.setConnectOptions("requiressl=1"); // enable PostgreSQL SSL connections
+if (!db.open()) {
+    db.setConnectOptions(); // clear options
+    ...
+}
+...
+// ODBC connection
+db.setConnectOptions("SQL_ATTR_ACCESS_MODE=SQL_MODE_READ_ONLY;SQL_ATTR_TRACE=SQL_OPT_TRACE_ON"); // set ODBC options
+if (!db.open()) {
+    db.setConnectOptions(); // don't try to set this option
+    ...
+}
+//! [4]
+
+
+//! [5]
+#include "qtdir/src/sql/drivers/psql/qsql_psql.cpp"
+//! [5]
+
+
+//! [6]
+PGconn *con = PQconnectdb("host=server user=bart password=simpson dbname=springfield");
+QPSQLDriver *drv =  new QPSQLDriver(con);
+QSqlDatabase db = QSqlDatabase::addDatabase(drv); // becomes the new default connection
+QSqlQuery query;
+query.exec("SELECT NAME, ID FROM STAFF");
+...
+//! [6]
+
+
+//! [7]
+unix:LIBS += -lpq
+win32:LIBS += libpqdll.lib
+//! [7]
+
+
+//! [8]
+QSqlDatabase db;
+qDebug() << db.isValid();    // Returns false
+
+db = QSqlDatabase::database("sales");
+qDebug() << db.isValid();    // Returns true if "sales" connection exists
+
+QSqlDatabase::removeDatabase("sales");
+qDebug() << db.isValid();    // Returns false
+//! [8]