java - JDBC 准备语句 SQLSyntaxErrorException

Question

我已经阅读了之前与我的查询相关的问题。尝试在现有代码中进行这些更改。但仍然收到此错误。我花了 3 小时解决此问题，但无法捕获该错误。请帮助我解决。

我正在使用PreparedStatement发送SQL查询。下面是查询:

String getExistingFileEntry = "select * from test "
                                    + " where a = ? and b = ? and date < DATE_SUB(NOW(), INTERVAL 1 DAY)"
                                    + "order by id"
                                    + "limit 1";

PreparedStatement pstVerify = null;
            pstVerify = con.prepareStatement(getExistingFileEntry);
            pstVerify.setString(1, a);
            pstVerify.setString(2, b);

            ResultSet rsFirst =null;
            String existingSum = null;
            //execute select SQL statement
                    rsFirst = pstVerify.executeQuery();

收到此错误@rsFirst = pstVerify.executeQuery()

com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1' at line 1

我尝试在工作台上运行此 SQL 查询并返回正确的行。 有人可以指出我哪里做错了吗？

谢谢!

Answer 1

检查你的空间替换这个

String getExistingFileEntry = "select * from test "
                                    + " where a = ? and b = ? and date < DATE_SUB(NOW(), INTERVAL 1 DAY)"
                                    + "order by id"
                                    + "limit 1";

由

String getExistingFileEntry = "select * from test "
            + " where a = ? and b = ? and date < DATE_SUB(NOW(), INTERVAL 1 DAY)"
            + " order by id"
            + " limit 1";