如何从存储过程中找到哪个唯一索引失败?
我创建了一个具有单列主键和三个单列唯一索引的表:
CREATE TABLE tableName (
id INT UNSIGNED NOT NULL AUTO_INCREMENT,
col1 VARCHAR(50) NOT NULL,
col2 VARCHAR(50) NOT NULL,
col3 VARCHAR(50) NOT NULL,
PRIMARY KEY (id),
UNIQUE INDEX id_UNIQUE (id ASC),
UNIQUE INDEX col1_UNIQUE (col1 ASC),
UNIQUE INDEX col2_UNIQUE (col2 ASC),
UNIQUE INDEX col3_UNIQUE (col3 ASC)
) ENGINE = InnoDB;
我创建了一个存储过程来处理错误“1062”:“密钥 %d 的重复条目 %s”:
DELIMITER $$
CREATE PROCEDURE insertRecord (
col1Value VARCHAR(50),
col2Value VARCHAR(50),
col3Value VARCHAR(50),
OUT idValue INT,
OUT errColName VARCHAR(50)
) BEGIN
DECLARE EXIT HANDLER FOR 1062 BEGIN
SET errColName = 'Insert Column Name Here';
END;
INSERT tableName SET
col1 = col1Value,
col2 = col2Value,
col3 = col3Value;
SET idValue = LAST_INSERT_ID();
END;
$$
DELIMITER ;
我已经用不同的数据调用了存储过程 5 次以返回各种结果:
第一次插入尝试成功
-- Initialize parameters
SET @col1Val = 'MySQL',
@col2Val = 'Is',
@col3Val = 'Cool',
@Id = NULL,
@ErrColName = NULL;
-- 1st Insert Attempt
CALL insertRecord(@col1Val, @col2Val, @col3Val, @Id, @ErrColName);
-- Expected result: @Id = 1, @ErrColName = NULL
SELECT @Id '@Id', @ErrColName '@ErrColName';
第二次插入尝试失败,因为 col1 不是唯一的
-- Re-initialize parameters
SET @col1Val = 'MySQL', -- Intended to generate an error
@col2Val = 'Is',
@col3Val = 'Cool',
@Id = NULL,
@ErrColName = NULL;
-- 2nd Insert Attempt
CALL insertRecord(@col1Val, @col2Val, @col3Val, @Id, @ErrColName);
-- Expected result: @Id = NULL, @ErrColName = 'col1'
SELECT @Id '@Id', @ErrColName '@ErrColName';
第三次插入尝试失败,因为 col2 不是唯一的
-- Re-initialize parameters
SET @col1Val = 'SQL',
@col2Val = 'Is', -- Intended to generate an error
@col3Val = 'Cool',
@Id = NULL,
@ErrColName = NULL;
-- 3rd Insert Attempt
CALL insertRecord(@col1Val, @col2Val, @col3Val, @Id, @ErrColName);
-- Expected result: @Id = NULL, @ErrColName = 'col2'
SELECT @Id '@Id', @ErrColName '@ErrColName';
第 4 次插入尝试失败,因为 col3 不是唯一的
-- Re-initialize parameters
SET @col1Val = 'SQL',
@col2Val = 'For',
@col3Val = 'Cool', -- Intended to generate an error
@Id = NULL,
@ErrColName = NULL;
-- 4th Insert Attempt
CALL insertRecord(@col1Val, @col2Val, @col3Val, @Id, @ErrColName);
-- Expected result: @Id = NULL, @ErrColName = 'col3'
SELECT @Id '@Id', @ErrColName '@ErrColName';
第 5 次插入尝试成功
-- Re-initialize parameters
SET @col1Val = 'SQL',
@col2Val = 'For',
@col3Val = 'Life',
@Id = NULL,
@ErrColName = NULL;
-- 5th Insert Attempt
CALL insertRecord(@col1Val, @col2Val, @col3Val, @Id, @ErrColName);
-- Expected result: @Id = 5, @ErrColName = NULL
SELECT @Id '@Id', @ErrColName '@ErrColName';
我需要在存储过程中做什么才能从存储过程中找到哪个唯一索引失败?
提前致谢。