执行准备语句时出现 java.sql.SQLSyntaxErrorException

Question

我尝试运行 preparedStatement ps 来检查数据库中是否存在数据。然后它将运行更新(如果存在)或插入(如果不存在)。但是，我收到语法错误

java.sql.SQLSyntaxErrorException: 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 'order WHERE date = '2019-05-22'' at line 1

我无法发现错误在哪里。谁能帮忙？

PreparedStatement ps,ps1;
        ps =con.prepareStatement("Select 1 from order WHERE date = ?");
        ps.setString(1, date);
        ResultSet rsOrder=ps.executeQuery();  
        if(rsOrder.next()) {  
            System.out.println("reOrder:  true");
            ps1 = con.prepareStatement("UPDATE order SET result = ?  WHERE date = ?");
            ps1.setString(1, json);
            ps1.setString(2, date);
            int rs=ps1.executeUpdate();

        }else {
            System.out.println("reOrder:  false");
            ps1 = con.prepareStatement("INSERT INTO order (date,result) VALUES (?,?)");
            ps1.setString(1, date);
            ps1.setString(2, json);
            int rs=ps1.executeUpdate();
        }

Answer 1

order是MySQL中的保留字。所以它不会允许，没有转义保留字。

您可以通过在关键字周围添加 ` 来转义它:

Select 1 from `order` WHERE date = ?

UPDATE `order` SET result = ? WHERE date = ?

INSERT INTO `order` (date, result) VALUES (?, ?)