实际上，我试图在删除记录之前获取一些记录并将其存储到 log_record 中。 这是我的桌子。但问题是我不知道如何将“SELECT *”的结果转换为数组，所以我无法在存储过程（SP）中循环它以根据列名和列值将其插入到记录中。
CREATE TABLE IF NOT EXISTS account (
id_account int(11) NOT NULL AUTO_INCREMENT,
account_name VARCHAR(30) NOT NULL,
account_location tinyint(4) NOT NULL,
create_at timestamp NOT NULL DEFAULT current_timestamp(),
PRIMARY KEY (id_account)
)ENGINE=InnoDB;
INSERT INTO account(account_name, account_location) VALUES('Me', 110),
('You', 110),
('Them', 2);
CREATE TABLE IF NOT EXISTS log_record (
id_log INT AUTO_INCREMENT PRIMARY KEY,
type tinyint not null,
table_affected VARCHAR(10),
column_name VARCHAR(30),
new_value VARCHAR(255),
create_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
constraint C_TYPE_LOG check(type IN (0,1))
)ENGINE=INNODB;
DROP PROCEDURE IF EXISTS deleteProcedure;
CREATE PROCEDURE deleteProcedure(IN KeyValue INT, IN TableName VARCHAR(30), IN PrimaryKey VARCHAR(30), OUT messegeResult VARCHAR(30))
BEGIN
DECLARE ColumnName VARCHAR(30);
DECLARE ColumnValue VARCHAR(30);
DECLARE result TINYINT(1);
DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN
ROLLBACK;
RESIGNAL;
SET messegeResult = null;
END;
-- # THIS FOR TURN INTO ARRAY AREA
-- # But i don't know how to turn result of "SELECT *" INTO array of value and array of column name
SET @ArrayColumnValue = '';
SET @ArrayColumnName = '';
SELECT * FROM TableName WHERE PrimaryKey = KeyValue;
START TRANSACTION;
-- # LOOP AREA FOR INSERT
WHILE (LOCATE(',', @ArrayColumnValue) > 0)
DO
SET @ColumnName = ELT(1, @ArrayColumnName);
SET @ArrayColumnName= SUBSTRING(@ArrayColumnName, LOCATE(',',@ArrayColumnName) + 1);
SET @ColumnValue = ELT(1, @ArrayColumnValue);
SET @ArrayColumnValue= SUBSTRING(@ArrayColumnValue, LOCATE(',',@ArrayColumnValue) + 1);
INSERT INTO log_record(type, table_affected, column_name, old_value)
VALUES('DELETE', TableName, @ColumnName ,@ColumnValue);
END WHILE;
SELECT ROW_COUNT() INTO result;
-- # CHECK IS SUCCESS BEING INSERT
IF (@result = 0) THEN
ROLLBACK;
SET messegeResult = 'FAILED';
ELSE
DELETE FROM TableName WHERE PrimaryKey = KeyValue;
SET messegeResult = 'SUCCESS';
END IF;
COMMIT;
END
还是一开始就做错了？就像使用错误的方法来解决愚蠢的事情而不是应该轻松完成的事情。 我是这件事的新手，如果您知道我使用错误的方式，请告诉我使用其他方式。 TT
答案 0 :(得分：0)
我正在 maria DB 上对其进行测试，并且工作正常。
CREATE PROCEDURE DeleteProcedure(IN LogTableName VARCHAR(100), IN TableName VARCHAR(100), in InputValues varchar(1000))
ProcLabel:BEGIN
-- Local Variable
DECLARE log_column_names, column_names, current_column_name, current_input_value, column_names_repeat, input_values_found, input_value_params VARCHAR(1000);
DECLARE table_key_name, this_table_name, table_key_data_type VARCHAR(100);
DECLARE column_start_pos, column_comma_pos, column_loop_count, row_start_pos, row_comma_pos, row_loop_count, total_column_loop_count, input_values_found_length SMALLINT;
DECLARE column_end_loop, row_end_loop, table_key_data_type_char TINYINT;
-- Declare Condition
DECLARE TableNotFound CONDITION for 1146 ;
-- Exit Handler
DECLARE EXIT HANDLER FOR TableNotFound
BEGIN
SELECT CONCAT('Table ', @this_table_name ,' Are Not Found') MESSAGE_TEXT;
END;
-- Set Array Column
SET @this_table_name = TableName;
SET @SQL = "SELECT GROUP_CONCAT(column_name SEPARATOR ', ') FROM information_schema.columns WHERE table_name = ? INTO @column_names";
PREPARE stmt FROM @SQL;
EXECUTE stmt USING @this_table_name;
SET @this_table_name = LogTableName;
SET @SQL = "SELECT GROUP_CONCAT(column_name SEPARATOR ', ') FROM information_schema.columns WHERE table_name = ? AND column_key != 'PRI' AND column_name != 'create_at' INTO @log_column_names";
PREPARE stmt FROM @SQL;
EXECUTE stmt USING @this_table_name;
SET @SQL = "SELECT column_name, data_type FROM information_schema.columns WHERE table_name = ? AND column_key = 'PRI' INTO @table_key_name, @table_key_data_type";
PREPARE stmt FROM @SQL;
EXECUTE stmt USING TableName;
SELECT IF(LOWER(SUBSTRING(@table_key_data_type, -3, 3) != 'int'), TRUE, FALSE) INTO @table_key_data_type_char;
SET @SQL = CONCAT("INSERT INTO ", LogTableName ," (", @log_column_names ,") VALUES");
-- Set Default Value Before Loop
SET @SQLVAL = '';
SET @row_start_pos = 1;
SET @row_comma_pos = LOCATE(',', InputValues);
SET @row_loop_count = 0;
SET @total_column_loop_count = 0;
SET @input_values_found = '';
SET @input_value_params = InputValues;
InputValueRepeat:REPEAT
IF @row_comma_pos > 0 THEN
SET @current_input_value = SUBSTRING(InputValues, @row_start_pos, @row_comma_pos - @row_start_pos);
SET @row_end_loop = 0;
ELSE
SET @current_input_value = SUBSTRING(InputValues, @row_start_pos);
SET @row_end_loop = 1;
END IF;
SET @SQLC = CONCAT("SELECT COUNT(1) FROM ", TableName ," WHERE ", @table_key_name ," = ", @current_input_value ," INTO @record_found");
PREPARE stmtC FROM @SQLC;
EXECUTE stmtC;
DEALLOCATE PREPARE stmtC;
IF @record_found = 1 AND @row_loop_count > 0 AND @column_loop_count IS NOT NULL THEN
set @SQLVAL = CONCAT(@SQLVAL,",");
END IF;
IF @record_found = 1 THEN
SET @column_start_pos = 1;
SET @column_comma_pos = LOCATE(',', @column_names);
SET @column_names_repeat = @column_names;
SET @column_loop_count = 0;
ColumnNameRepeat:REPEAT
IF @column_comma_pos > 0 THEN
SET @current_column_name = SUBSTRING(@column_names_repeat, @column_start_pos, @column_comma_pos - @column_start_pos);
SET @column_end_loop = 0;
ELSE
SET @current_column_name = SUBSTRING(@column_names_repeat, @column_start_pos);
SET @column_end_loop = 1;
END IF;
SET @SQLSV = CONCAT("SELECT ", @current_column_name ," FROM ", TableName ," WHERE ", @table_key_name ," = ? INTO @current_column_value");
PREPARE stmtSV FROM @SQLSV;
EXECUTE stmtSV USING @current_input_value;
DEALLOCATE PREPARE stmtSV;
SET @SQLVAL = CONCAT(@SQLVAL, "('", CONCAT_WS("','", 'D', TableName, @current_column_name, @current_column_value, @current_input_value) ,"')");
IF @column_end_loop = 0 THEN
SET @column_names_repeat = substring(@column_names_repeat, @column_comma_pos + 1);
SET @column_comma_pos = LOCATE(',', @column_names_repeat);
set @SQLVAL = CONCAT(@SQLVAL,",");
END IF;
SET @column_loop_count = @column_loop_count + 1;
UNTIL @column_end_loop = 1
END REPEAT;
SET @total_column_loop_count = @total_column_loop_count + @column_loop_count;
IF @input_values_found != '' THEN
IF (@table_key_data_type_char = TRUE) THEN
SET @input_values_found = CONCAT_WS("','", @input_values_found, @current_input_value);
ELSE
SET @input_values_found = CONCAT_WS(",", @input_values_found, @current_input_value);
END IF;
ELSE
SET @input_values_found = @current_input_value;
END IF;
END IF;
IF @row_end_loop = 0 THEN
SET InputValues = substring(InputValues, @row_comma_pos + 1);
SET @row_comma_pos = LOCATE(',', InputValues);
ELSE
set @SQLVAL = CONCAT(@SQLVAL,";");
END IF;
SET @row_loop_count = @row_loop_count + 1;
UNTIL @row_end_loop = 1
END REPEAT;
IF (table_key_data_type_char = TRUE) THEN
SET @input_values_found = CONCAT("'", @input_values_found ,"'");
END IF;
SELECT CHAR_LENGTH(CONCAT(@input_values_found)) INTO @input_values_found_length;
if @input_values_found_length < 3 AND @table_key_data_type_char = TRUE OR @table_key_data_type_char = FALSE AND @input_values_found_length < 1 THEN
SELECT CONCAT("Can't find input value : [", @input_value_params ,"] on table ", TableName) MESSAGE_TEXT;
DEALLOCATE PREPARE stmt;
LEAVE ProcLabel;
END IF;
START TRANSACTION;
SET @SQL = CONCAT(@SQL, @SQLVAL);
PREPARE stmt FROM @SQL;
EXECUTE stmt;
SELECT ROW_COUNT() into @affected_row;
IF (@affected_row != @total_column_loop_count) THEN
SELECT CONCAT("Failed to insert data expected row : ", @column_loop_count ,", affected row : ", @affected_row) MESSAGE_TEXT;
ROLLBACK;
DEALLOCATE PREPARE stmt;
LEAVE ProcLabel;
END IF;
SET @affected_row = 0;
SET @SQL = CONCAT("DELETE FROM ", TableName ," WHERE ", @table_key_name ," IN (", @input_values_found ,")");
PREPARE stmt FROM @SQL;
EXECUTE stmt;
SELECT ROW_COUNT() INTO @affected_row;
IF (@affected_row = 0) THEN
SELECT CONCAT("Failed to delete ", TableName ," on record key ", @input_values_found) MESSAGE_TEXT;
ROLLBACK;
DEALLOCATE PREPARE stmt;
LEAVE ProcLabel;
END IF;
SELECT CONCAT("Success ", @affected_row ," record on ", TableName ," was deleted") MESSAGE_TEXT;
COMMIT;
DEALLOCATE PREPARE stmt;
END
我们需要像 Call DeleteProcedure('[to table]','[from table]','[array of keys to delete]'); => Call DeleteProcedure('log_history','orders','1,3,4');
所以我们可以选择尽可能多的使用逗号分隔符，例如第三个参数上的“1,2,3”。但是我还没有在超过一百个键上尝试过，因为第三个参数数据类型是 varchar(1000)。 我希望在不久的将来有人可以解决这个问题。