c++ - QT数据库模块错误

Question

我第一次在 QT 5.6.0 版本中为数据库模块编写代码，但我在下面的行中遇到错误，我不知道如何解决

代码行：

QString insertTable=QString("INSERT INTO %1(%2,%3)" "VALUES (%4,%5)".arg(tableName).arg("\'schema\'","\'timestamp\'").arg(schema,timestamp));

错误是：

C:\Users\ankit.ahlawat\Desktop\Infosys\git\IoTGateway_Database\database.cpp:212: error: request for member 'arg' in '"INSERT INTO %1(%2,%3)VALUES (%4,%5)"', which is of non-class type 'const char [36]'
                             "VALUES (%4,%5)".arg(tableName).arg("\'schema\'","\'timestamp\'").arg(schema,timestamp));

                                      ^

标签： c++databaseqtpostgresql-9.4

Answer 1

QString您在调用构造函数时放错了括号：

QString("INSERT INTO %1(%2,%3)" "VALUES (%4,%5)".arg(tableName).arg("\'schema\'","\'timestamp\'").arg(schema,timestamp))

应该：

QString("INSERT INTO %1(%2,%3)" "VALUES (%4,%5)").arg(tableName).arg("\'schema\'","\'timestamp\'").arg(schema,timestamp)