SQLITE和QT

sqlite3数据库支持事务

例如：

 BEGIN DEFERRED TRANSACTION;
 INSERT INTO main.test_transaction (test_unique) VALUES ('test_6');
 INSERT INTO main.test_transaction (test_unique) VALUES ('test_6');
 COMMIT TRANSACTION;

第二个插入sql语句是不符合约束的，所以事务提交失败。

对比mysql，例如：

 SET autocommit = 0;
 START TRANSACTION;
 INSERT INTO `他天天天天`.test_2 (test_column,test_column2) VALUES ('', 'test2');
 INSERT INTO `他天天天天`.test_2 (test_column,test_column2) VALUES ('', 'test3');
 COMMIT;

同样，第二个插入sql语句是不符合约束的，所以事务提交失败。

但是到了qt里面使用sqlite3数据库时却发现了个问题：提交事务时，sql语句有正确的、错误的，但是提交都会成功，commit函数返回true。

请看测试代码：

 bool test__Qsql_transaction5()
 {
     bool is_success = false;

     do
     {
         QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
         db.setDatabaseName("dbName_test_transaction");
         db.setHostName("AK-PC");
         db.setUserName("Asterisk");
         db.setPassword("");
         //db.setPort(12345);
         if (db.open("Asterisk", ""))
         {
             if (db.transaction())
             {
                 QSqlQuery query;

                 QString sql;

                 sql = "CREATE TABLE IF NOT EXISTS test_transaction (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200));";
                 query.exec(sql);
                 qDebug() << query.lastError();

                 sql = "INSERT INTO test_transaction (tid,param_2) VALUES ('7','test2');";
                 bool b1 = query.exec(sql);
                 qDebug() << query.lastError();

                 sql = "INSERT INTO test_transaction (tid,param_2) VALUES ('8','test2');";
                 bool b2 = query.exec(sql);
                 qDebug() << query.lastError();

                 if ( !db.commit() )
                 {
                     qDebug() << db.lastError();
                     if ( !db.rollback() )
                         qDebug() << db.lastError();
                 }
             }
         }
         db.close();

     } while ( false );

     return is_success;
 }

同样，第二个插入sql语句是不符合约束的，所以事务提交失败。但是“db.commit()”返回true，不知道问题出在哪里。

完成测试代码：

 #include <QtCore/QCoreApplication>
 #include <QSqlDatabase>
 #include <QSqlQuery>
 #include <QString>
 #include <QDebug>
 #include <QSqlError>
 #include <QSqlDriver>

 #include <iostream>

 bool test__Qsql_transaction()
 {
     bool is_success = false;

     do
     {
         QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", "connectionName_test_transaction");
         db.setDatabaseName("dbName_test_transaction");
         db.setHostName("AK-PC");
         db.setUserName("Asterisk");
         db.setPassword("");
         //db.setPort(12345);
         if (db.open("Asterisk", ""))
         {
             if (db.transaction())
             {
                 QSqlQuery query(db);

                 QString sql;

                 sql = "CREATE TABLE IF NOT EXISTS test_transaction (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200));";
                 query.exec(sql);
                 qDebug() << query.lastError();

                 sql = "INSERT INTO test_transaction (tid,param_2) VALUES ('7','test2');";
                 bool b1 = query.exec(sql);
                 qDebug() << query.lastError();

                 sql = "INSERT INTO test_transaction (tid,param_2) VALUES ('8','test3');";
                 bool b2 = query.exec(sql);
                 qDebug() << query.lastError();

                 if ( !db.commit() )
                 {
                     qDebug() << db.lastError();
                     if ( !db.rollback() )
                         qDebug() << db.lastError();
                 }
             }
         }
         db.close();

     } while ( false );

     return is_success;
 }
 bool test__Qsql_transaction2()
 {
     bool is_success = false;

     do
     {
         QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", "connectionName_test_transaction");
         db.setDatabaseName("dbName_test_transaction");
         db.setHostName("AK-PC");
         db.setUserName("Asterisk");
         db.setPassword("");
         //db.setPort(12345);
         if (db.open("Asterisk", ""))
         {
             QSqlQuery query0(db);

             QString sql;
             bool b;

             sql = "CREATE TABLE IF NOT EXISTS test_transaction1 (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200), param_2 VARCHAR(80) NOT NULL UNIQUE);";
             b = query0.exec(sql);
             qDebug() << query0.lastError();

             sql = "CREATE TABLE IF NOT EXISTS test_transaction2 (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200), param_2 VARCHAR(80) NOT NULL UNIQUE);";
             b = query0.exec(sql);
             qDebug() << query0.lastError();

             bool bSupportTransaction = db.driver()->hasFeature(QSqlDriver::Transactions);
             if (db.transaction())
             {
                 QSqlQuery query(db);

                 QString sql1, sql2, sql3, sql4, sql5;
                 bool b1, b2, b3, b4, b5;
                 QString qstrid = "";

                 sql2 = "INSERT OR REPLACE INTO test_transaction2 (tid, param_3, param_2) VALUES ('";
                 sql2 += qstrid;
                 sql2 += "','test_1','test_2');";
                 b2 = query.exec(sql2);
                 qDebug() << query.lastError();

                 sql5 = "DELETE FROM test_transaction1 WHERE tid = '";
                 sql5 += qstrid;
                 sql5 += "';";
                 b5 = query.exec(sql5);
                 qDebug() << query.lastError();

                 if ( !db.commit() )
                 {
                     db.rollback();
                 }
             }
         }

     } while ( false );

     return is_success;
 }
 bool test__Qsql_transaction3()
 {
     bool is_success = false;

     do
     {
         bool bUse = QSqlDatabase::isDriverAvailable("QOCI");
         QSqlDatabase db = QSqlDatabase::addDatabase("QOCI", "connectionName_test_transaction3");
         db.setDatabaseName("dbName_test_transaction_by_oracle");
         db.setHostName("AK-PC");
         db.setUserName("Asterisk");
         db.setPassword("");
         //db.setPort(12345);
         if (db.open("Asterisk", ""))
         {
             QSqlQuery query0(db);

             QString sql;
             bool b;

             sql = "CREATE TABLE IF NOT EXISTS test_transaction1 (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200), param_2 VARCHAR(80) NOT NULL UNIQUE);";
             b = query0.exec(sql);
             qDebug() << query0.lastError();

             sql = "CREATE TABLE IF NOT EXISTS test_transaction2 (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200), param_2 VARCHAR(80) NOT NULL UNIQUE);";
             b = query0.exec(sql);
             qDebug() << query0.lastError();

             bool bSupportTransaction = db.driver()->hasFeature(QSqlDriver::Transactions);
             if (db.transaction())
             {
                 QSqlQuery query(db);

                 QString sql1, sql2, sql3, sql4, sql5;
                 bool b1, b2, b3, b4, b5;
                 QString qstrid = "";

                 sql2 = "INSERT OR REPLACE INTO test_transaction2 (tid, param_3, param_2) VALUES ('";
                 sql2 += qstrid;
                 sql2 += "','test_1','test_2');";
                 b2 = query.exec(sql2);
                 qDebug() << query.lastError();

                 sql5 = "DELETE FROM test_transaction1 WHERE tid = '";
                 sql5 += qstrid;
                 sql5 += "';";
                 b5 = query.exec(sql5);
                 qDebug() << query.lastError();

                 if ( !db.commit() )
                 {
                     db.rollback();
                 }
             }
         }

     } while ( false );

     return is_success;
 }
 bool test__Qsql_transaction4()
 {
     bool is_success = false;

     do
     {
         bool bUse = QSqlDatabase::isDriverAvailable("QMYSQL");
         QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
         qDebug() << db.lastError();

         db.setDatabaseName("dbName_test_transaction_by_mysql");
         db.setHostName("AK-PC");
         db.setUserName("Asterisk");
         db.setPassword("");
         //db.setPort(12345);
         if (db.open("Asterisk", ""))
         {
             QSqlQuery query0(db);

             QString sql;
             bool b;

             sql = "CREATE TABLE IF NOT EXISTS test_transaction1 (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200), param_2 VARCHAR(80) NOT NULL UNIQUE);";
             b = query0.exec(sql);
             qDebug() << query0.lastError();

             sql = "CREATE TABLE IF NOT EXISTS test_transaction2 (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200), param_2 VARCHAR(80) NOT NULL UNIQUE);";
             b = query0.exec(sql);
             qDebug() << query0.lastError();

             bool bSupportTransaction = db.driver()->hasFeature(QSqlDriver::Transactions);
             if (db.transaction())
             {
                 QSqlQuery query(db);

                 QString sql1, sql2, sql3, sql4, sql5;
                 bool b1, b2, b3, b4, b5;
                 QString qstrid = "";

                 sql2 = "INSERT OR REPLACE INTO test_transaction2 (tid, param_3, param_2) VALUES ('";
                 sql2 += qstrid;
                 sql2 += "','test_1','test_2');";
                 b2 = query.exec(sql2);
                 qDebug() << query.lastError();

                 sql5 = "DELETE FROM test_transaction1 WHERE tid = '";
                 sql5 += qstrid;
                 sql5 += "';";
                 b5 = query.exec(sql5);
                 qDebug() << query.lastError();

                 if ( !db.commit() )
                 {
                     db.rollback();
                 }
             }
         }

     } while ( false );

     return is_success;
 }
 bool test__Qsql_transaction5()
 {
     bool is_success = false;

     do
     {
         QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
         db.setDatabaseName("dbName_test_transaction");
         db.setHostName("AK-PC");
         db.setUserName("Asterisk");
         db.setPassword("");
         //db.setPort(12345);
         if (db.open("Asterisk", ""))
         {
             if (db.transaction())
             {
                 QSqlQuery query;

                 QString sql;

                 sql = "CREATE TABLE IF NOT EXISTS test_transaction (tid INTEGER NOT NULL PRIMARY KEY ASC AUTOINCREMENT, param_1 VARCHAR(200));";
                 query.exec(sql);
                 qDebug() << query.lastError();

                 sql = "INSERT INTO test_transaction (tid,param_2) VALUES ('7','test2');";
                 bool b1 = query.exec(sql);
                 qDebug() << query.lastError();

                 sql = "INSERT INTO test_transaction (tid,param_2) VALUES ('8','test2');";
                 bool b2 = query.exec(sql);
                 qDebug() << query.lastError();

                 if ( !db.commit() )
                 {
                     qDebug() << db.lastError();
                     if ( !db.rollback() )
                         qDebug() << db.lastError();
                 }
             }
         }
         db.close();

     } while ( false );

     return is_success;
 }

 int main(int argc, char *argv[])
 {
     QCoreApplication a(argc, argv);

     //std::cout << std::boolalpha << test__Qsql_transaction() << std::endl;
     //std::cout << std::boolalpha << test__Qsql_transaction2() << std::endl;
     //std::cout << std::boolalpha << test__Qsql_transaction3() << std::endl;
     //std::cout << std::boolalpha << test__Qsql_transaction4() << std::endl;
     std::cout << std::boolalpha << test__Qsql_transaction5() << std::endl;

     return a.exec();
 }

*注：希望哪个高手能够帮我指出是我对qt操作sqlite有问题，还是qt对sqlite的操作就是这样的。万分感谢。