Question

使用JDBC并且我不断收到hoursWorkedToday令牌的语法标记错误，即使它是合法变量，hoursWorked是列名。类型也匹配。

projectUpdate.executeUpdate("INSERT INTO projectLog (hoursWorked, weyerhaeuserWork, sudokuWork,websiteWork, scriptWork," +
                    "tropeWork) VALUES ("hoursWorkedToday +",'"+internWork+"','"+sudokuWork+"', '"+websiteWork+"' ,'"+scriptWork+"' ,'"+tropeWork+"')");

再次在hoursWorkedToday上获取错误，不知道为什么......语法与我运行的其他查询匹配，例如......

workoutUpdate.executeUpdate("INSERT INTO workoutLog (workedOut, milesRan, comments) VALUES (1,"+miles+" ,"+
                    workoutComments+"')");

Answer 1

VALUES ("hoursWorkedToday在语法上不正确。您错过了+符号。

我强烈建议您使用PreparedStatement而不是自己组装SQL字符串。 PreparedStatements更快（数据库驱动程序将编译并重用它们），更易于使用，并保护您免受SQL注入。

您可以使用PreparedStatement替换您的查询，如下所示：

PreparedStatement p = connection.prepareStatement("INSERT INTO projectLog(hoursWorked, weyerhaeuserWork, sudokuWork,websiteWork, scriptWork, tropeWork) VALUES (?, ?, ?, ?, ?, ?)");
p.setInt(1, hoursWorkedToday);
...
p.execute();

Answer 2

projectUpdate.executeUpdate（＆＃34; INSERT INTO projectLog（hoursWorked， weyerhaeuserWork，sudokuWork，websiteWork，scriptWork，＆＃34; +＆＃34; tropeWork）价值观（＆＃39;＆＃34; + hoursWorkedToday +＆＃34;＆＃39;＆＃39;＆＃34; + internWork +＆＃34;＆＃39;＆＃39;＆＃34; + sudokuWork +＆＃34;＆＃39;，＆＃39;＆＃34; + websiteWork +＆＃34;＆＃39;，＆＃39;＆＃34; + scriptWork +＆＃34;＆＃39 ;，＆＃39;＆＃34; + tropeWork +＆＃34;＆＃39;）＆＃34;）;

不确定但有效，但您可以试试。你没有添加＆＃39;＆＃39;到hoursWorkedToday +

Answer 3

您错过了结束报价和hoursWorkedToday之间的加号：

projectUpdate.executeUpdate("INSERT INTO projectLog (hoursWorked, weyerhaeuserWork, sudokuWork,websiteWork, scriptWork," +
"tropeWork) VALUES (" + hoursWorkedToday +",'"+internWork+"','"+sudokuWork+"', '"+websiteWork+"' ,'"+scriptWork+"' ,'"+tropeWork+"')");
--                    ^ here

为什么我在这个令牌上遇到语法错误？

3 个答案: