测试QT与mysql是否链接时，出现了三个错误，怎么也改不过来了，求求大牛们帮看看：
qsql_mysql.cpp:632: error: ‘numericalPrecisionPolicy’ was not declared in this scope
qsql_mysql.cpp:1415: error: ‘isIdentifierEscaped’ was not declared in this scope
qsql_mysql.cpp:1416: error: ‘stripDelimiters’ was not declared in this scope
这是怎么回事？谢谢啦～～
