Question

我有一些代码因为一些错误的分号而触发了语法错误。如果这是在命令行上运行，我会用分隔符来解决这个问题。不幸的是，jdbc4驱动程序似乎没有识别分隔符。无论如何要让它运行？

delimiter |
CREATE TRIGGER obs_update BEFORE UPDATE ON obs
FOR EACH ROW
BEGIN
   IF OLD.voided = 0 AND NEW.voided = 1 THEN
      DELETE FROM clinic_obs WHERE id = OLD.obs_id;
   ELSE
      UPDATE clinic_obs SET clinic_obs.revision_token = NOW()
      WHERE NEW.obs_id = clinic_obs.id;
   END IF;
END;
|
delimiter ;

Answer 1

Delimiter是SQL客户端的命令。在JDBC中不需要使用分隔符。以下示例显示了它：

import java.sql.*;

public class TriggerExample {

    public static void main(String args[]) {

        String connectionURL = "jdbc:mysql://localhost:3306/test";
        Connection con = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection(connectionURL, "login",
                    "password");
            Statement stmt = con.createStatement();
            stmt.execute("CREATE TRIGGER obs_update BEFORE UPDATE ON obs "
                    + "FOR EACH ROW "
                    + "BEGIN "
                    + "IF OLD.voided = 0 AND NEW.voided = 1 THEN "
                    + "   DELETE FROM clinic_obs WHERE id = OLD.obs_id; "
                    + "ELSE "
                    + "   UPDATE clinic_obs SET clinic_obs.revision_token = NOW() "
                    + "   WHERE NEW.id = clinic_obs.id; "
                    + "END IF; "
                    + "END;");
            con.close();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (con != null) {
                try {
                    con.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

Answer 2

尝试在最后的END字后删除分号。所以它看起来像这样：

delimiter |
CREATE TRIGGER obs_update BEFORE UPDATE ON obs
FOR EACH ROW
BEGIN
   IF OLD.voided = 0 AND NEW.voided = 1 THEN
      DELETE FROM clinic_obs WHERE id = OLD.obs_id;
   ELSE
      UPDATE clinic_obs SET clinic_obs.revision_token = NOW()
      WHERE NEW.obs_id = clinic_obs.id;
   END IF;
END|

它应该可以工作，因为我使用jdbc驱动程序完成了类似的触发器/过程。

mysql jdbc驱动程序不支持具有多个语句的触发器中的分隔符

2 个答案: