Question

我的查询在workbanch中运行完美，但没有使用Java发送MySQL语法错误的异常：

Set @total=0;
SET @amountDue=0;
SELECT (l.paid_date),c.customer_name,IF(@total=0,(SELECT total_amount FROM 
payment_loan WHERE loan_id=99)-(SELECT (installment_amount_month) FROM
payment_loan WHERE loan_id=99)*(SELECT (total_installments) 
FROM payment_loan
   WHERE loan_id=99),
       (SELECT (installment_amount_month) FROM payment_loan WHERE
       loan_id=99))AS AmountDue,
           @amountDue:=@amountDue+(SELECT IF(@total=0,(SELECT (total_amount)
          FROM payment_loan WHERE loan_id=99)-(SELECT (installment_amount_month) FROM payment_loan 
        WHERE loan_id=99)*(SELECT (total_installments) FROM payment_loan 
        WHERE loan_id=99),(SELECT (installment_amount_month) FROM 
      payment_loan WHERE loan_id=99))) as ComulativeDue,
     l.amount AS AmountPaid, @total := @total +l.amount AS comulativePaid, 
     (@total/@amountDue ) as percentage FROM payments_details l Join 
     customer c on (c.customer_id=l.customer_id) WHERE l.customer_id=115 
    GROUP BY l.paid_date ORDER BY   l.paid_date DESC LIMIT 1  ;

我的java代码是：

     PreparedStatement stmt = (PreparedStatement) connection.Connect.con.prepareStatement(query);
        rs = stmt.executeQuery();
        while (rs.next()) {
            cName = rs.getString(2);
            amountDue = rs.getInt(3);
       }

错误：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException：你有一个 SQL语法错误;查看与您的手册相对应的手册 MySQL服务器版本，用于在'SET附近使用正确的语法 @ amountDue = 0; SELECT（l.paid_date），c.customer_name，IF（@ total = 0，（SELECT 总数'在第2行

Answer 1

默认情况下，不允许在单个调用中进行多个查询。这在Multiple queries executed in java in single statement中很好地描述了：

发送连接请求时，您需要附加连接属性allowMultiQueries=true到数据库url。这是额外的连接属性，如果已经存在一些，如 autoReConnect=true等。allowMultiQueries的可接受值属性为true，false，yes和no。任何其他价值在运行时被SQLException拒绝。
String dbUrl = "jdbc:mysql:///test?allowMultiQueries=true";
...

Answer 2

修改您的查询：

SELECT (l.paid_date),c.customer_name,IF(@total=0,(SELECT total_amount FROM 
payment_loan WHERE loan_id=99)-(SELECT (installment_amount_month) FROM
payment_loan WHERE loan_id=99)*(SELECT (total_installments) 
FROM payment_loan, (SELECT @total:=0, @amountDue:=0) setup
   WHERE loan_id=99),
       (SELECT (installment_amount_month) FROM payment_loan WHERE
       loan_id=99))AS AmountDue,
           @amountDue:=@amountDue+(SELECT IF(@total=0,(SELECT (total_amount)
          FROM payment_loan WHERE loan_id=99)-(SELECT (installment_amount_month) FROM payment_loan 
        WHERE loan_id=99)*(SELECT (total_installments) FROM payment_loan 
        WHERE loan_id=99),(SELECT (installment_amount_month) FROM 
      payment_loan WHERE loan_id=99))) as ComulativeDue,
     l.amount AS AmountPaid, @total := @total +l.amount AS comulativePaid, 
     (@total/@amountDue ) as percentage FROM payments_details l Join 
     customer c on (c.customer_id=l.customer_id) WHERE l.customer_id=115 
    GROUP BY l.paid_date ORDER BY   l.paid_date DESC LIMIT 1  ;

Java代码中的语法错误，但在MySQL workbanch中运行

2 个答案: