I'm working with SQLite, doing insert into table. Folowwing
我在使用SQLite，做插入到表格中。跟随
QSqlQuery testQuery(QString("INSERT INTO test(testcol) VALUES(?)"));
testQuery.bindValue(0, someQStringObg);
testQuery.exec();
works, but
有效,但
QSqlQuery testQuery(QString("INSERT INTO test(testcol) VALUES(:val)"));
testQuery.bindValue(":val", someQStringObg);
testQuery.exec();
don't. testQuery.lastError().text() returns No query Unable to fetch row
不喜欢。text()返回无法获取行的查询
Have no clue why things are that way, but really want to find out.
不知道为什么事情是那样的，但真的想知道。
1 个解决方案
#1
7
Please use prepare as the official example:
请使用prepare作为官方示例:
QSqlQuery testQuery;
testQuery.prepare("INSERT INTO test(testcol) VALUES(:val)");
testQuery.bindValue(":val", someQStringObj);
testQuery.exec();
The reason for the error is that the query was executed before binding to the corresponding placeholder. You can see the relevant part of the constructor documentation:
错误的原因是查询是在绑定到相应的占位符之前执行的。您可以看到构造函数文档的相关部分:
If query is not an empty string, it will be executed.
如果查询不是空字符串，它将被执行。
#1
7
Please use prepare as the official example:
请使用prepare作为官方示例:
QSqlQuery testQuery;
testQuery.prepare("INSERT INTO test(testcol) VALUES(:val)");
testQuery.bindValue(":val", someQStringObj);
testQuery.exec();
The reason for the error is that the query was executed before binding to the corresponding placeholder. You can see the relevant part of the constructor documentation:
错误的原因是查询是在绑定到相应的占位符之前执行的。您可以看到构造函数文档的相关部分:
If query is not an empty string, it will be executed.
如果查询不是空字符串，它将被执行。