MySQL

Question

我正在尝试使用准备好的语句将一行复制到同一个 table 中的新行 (INSERT) 并包含一些静态值。但是，我收到以下错误：

SQLException in copyProgram: java.sql.SQLException: Operand should contain 1 column(s)

我的输入是：

prId: 4 accountID: 50 newFromDate: 2020-04-27 newToDate: 2020-04-28

我的代码是：

    String insertQry = ("INSERT INTO at_program "
            + "(acc_id, pr_name, pr_start_date, pr_start_time, pr_end_date, pr_end_time, "
            + "pr_cost_pp, pr_woodbeads, pr_special, pr_joeys, pr_cubs, "
            + "pr_scouts, pr_venturers, pr_rovers, pr_leaders, pr_family, "
            + "pr_swimming, pr_pioneering, pr_archery, pr_canoe, pr_bushwalking, "
            + "pr_4wd, pr_abseiling, pr_snorkelling, pr_boating, "
            + "pr_rock_climbing, pr_caving, pr_branch_instructions, pr_policies_information, "
            + "pr_whs, pr_other, pr_notes) "
            + " (SELECT (?, pr_name, ?, pr_start_time, ?, pr_end_time, "
                    + "pr_cost_pp, pr_woodbeads, pr_special, pr_joeys, pr_cubs, "
                    + "pr_scouts, pr_venturers, pr_rovers, pr_leaders, pr_family, "
                    + "pr_swimming, pr_pioneering, pr_archery, pr_canoe, pr_bushwalking, "
                    + "pr_4wd, pr_abseiling, pr_snorkelling, pr_boating, "
                    + "pr_rock_climbing, pr_caving, pr_branch_instructions, pr_policies_information, "
                    + "pr_whs, pr_other, pr_notes) "
            + " FROM at_program "
            + " WHERE pr_id = ?);"); 

 ps = c.prepareStatement(insertQry, Statement.RETURN_GENERATED_KEYS);
            // Create a statement and execute the query on it               
            ps.setString(1, accountID);
            ps.setString(2, fromDate);
            ps.setString(3, toDate);
            ps.setString(4, prID);

            ps.executeUpdate();

Answer 1

您 SELECT 中的字段列表周围有括号！删除它们。

问题是 SELECT 需要一个（单个）列的列表，但您传递的是一个多列值。

SELECT x, y, z 将 x、y 和 z 视为三个值，每个值由一列组成，但您传递的 SELECT (x, y, z) 被解释为一个值有三个列，因此错误。

顺便说一下，整个 SELECT 周围的括号也是多余的，这次是因为 INSERT INTO table (columns) SELECT ... 本身就是一个公认的语法结构。

更正后的代码：

    String insertQry = ("INSERT INTO at_program "
            + "(acc_id, pr_name, pr_start_date, pr_start_time, pr_end_date, pr_end_time, "
            + "pr_cost_pp, pr_woodbeads, pr_special, pr_joeys, pr_cubs, "
            + "pr_scouts, pr_venturers, pr_rovers, pr_leaders, pr_family, "
            + "pr_swimming, pr_pioneering, pr_archery, pr_canoe, pr_bushwalking, "
            + "pr_4wd, pr_abseiling, pr_snorkelling, pr_boating, "
            + "pr_rock_climbing, pr_caving, pr_branch_instructions, pr_policies_information, "
            + "pr_whs, pr_other, pr_notes) "
            + " SELECT ?, pr_name, ?, pr_start_time, ?, pr_end_time, "
                    + "pr_cost_pp, pr_woodbeads, pr_special, pr_joeys, pr_cubs, "
                    + "pr_scouts, pr_venturers, pr_rovers, pr_leaders, pr_family, "
                    + "pr_swimming, pr_pioneering, pr_archery, pr_canoe, pr_bushwalking, "
                    + "pr_4wd, pr_abseiling, pr_snorkelling, pr_boating, "
                    + "pr_rock_climbing, pr_caving, pr_branch_instructions, pr_policies_information, "
                    + "pr_whs, pr_other, pr_notes "
            + " FROM at_program "
            + " WHERE pr_id = ?;");

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