{"id":32740,"date":"2023-02-01T11:39:31","date_gmt":"2023-02-01T06:09:31","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-create-an-auto-increment-value-on-mysql-using-a-text-field-closed\/"},"modified":"2023-02-01T11:39:31","modified_gmt":"2023-02-01T06:09:31","slug":"solved-how-to-create-an-auto-increment-value-on-mysql-using-a-text-field-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-create-an-auto-increment-value-on-mysql-using-a-text-field-closed\/","title":{"rendered":"[Solved] How to Create an auto-increment value on MySQL using a text field? [closed]"},"content":{"rendered":"

[ad_1]
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There are many things to solve the problem. Let me show you one of them by using MySQL procedures.<\/p>\n

Steps are as follows:<\/p>\n

1\u00b0) create a procedure that generates an identifier for a table (generate_id)<\/p>\n

2\u00b0) create a procedure that inserts the data into the table (insert_users) by using the first procedure (generate_id) to get a formatted ID, then it will return the inserted ID as a SELECT query.<\/p>\n

3\u00b0) Now, call the inserting procedure (insert_users)<\/p>\n

For more information, chat with Michel Magloire Ekanga<\/a> who is the main creator of this craftiness.<\/p>\n

LET’S USE AN EXAMPLE FOR EACH STEP<\/p>\n

STEP 1<\/h2>\n

generate_id procedure that should take as parameters: table_name, the primary_key, a joiner or a prefix for ID, the length for ID, and the output<\/p>\n

Our result should be as below: USER20210909000002 (joiner=USER, year=2021, mounth=09, day=09, increment=000002)<\/p>\n

# ---------------------   DEFINITION ------------------------------\nDROP PROCEDURE IF EXISTS generate_id;\nDELIMITER $$\n\nCREATE PROCEDURE generate_id(IN _db_table VARCHAR(255), IN _pkey VARCHAR(255),IN _joiner VARCHAR(255),_length INT, OUT _new_id VARCHAR(255))\nBEGIN\n    SET @max_id = NULL;\n    SET @sql = CONCAT('select max(`', _pkey, '`)  into @max_id from `', _db_table, '`');\n    PREPARE stmt FROM @sql;\n    EXECUTE stmt;\n    DEALLOCATE PREPARE stmt;\n    #------- Length for identifier -------\n    SET @length = 10;\n    SET @joiner_len = CHAR_LENGTH(_joiner);\n    IF _length > 0 AND (_length - CHAR_LENGTH(_joiner)) >= 10 THEN\n    SET @length = _length;\n    END IF;\n    #----------------------------\n    #--- the date variables ---\n    SET @today = DATE_FORMAT(NOW(),'%Y%m%d');\n    SET @r_str = LPAD(1,(@length - (8 + @joiner_len)), '0');\n    #\n    #---- FORMATING ID ------------------------\n    #\n    IF @max_id IS NULL THEN \n    # the table is empty\n    SET _new_id = CONCAT(_joiner,@today,@r_str);\n    ELSE \n    # the table is not empty\n    # 1\u00b0) reading parts from previous ID \n    SET @strlen = CHAR_LENGTH(@max_id);\n    SET @old_r_str = SUBSTR(@max_id, (@joiner_len + 4 + 2 + 2 + 1), @strlen);\n    SET @old_idx = CONVERT(@old_r_str, SIGNED INTEGER);\n    # 2\u00b0) checking if dates are the same\n    SET @old_date = SUBSTR(@max_id, (@joiner_len + 1), 8);\n    -- dates are not the same, we just take the 8 characters for date from the field\n    SET @new_idx = 1;\n    SET @new_r_str = LPAD(@new_idx,(@length - (8 + @joiner_len)), '0');\n    SET @new_max = CONCAT(_joiner,@today,@new_r_str);\n    IF @today = @old_date THEN\n        SET @new_idx = @old_idx + 1;\n        SET @new_r_str = LPAD(@new_idx,(@length - (8 + @joiner_len)), '0');\n        SET @new_max = CONCAT(_joiner,@old_date,@new_r_str);\n    END IF;\n    SET _new_id =  @new_max;\n    END IF;\nEND;\n$$\n\nDELIMITER ;\n<\/code><\/pre>\n
STEP 2<\/h2>\n
Procedure that uses the generated ID for insertion, we don’t need to provide an ID, it will generate the ID automaticaly<\/p>\n
DROP PROCEDURE IF EXISTS insert_users;\nDELIMITER $$\n\nCREATE PROCEDURE insert_users(\n    login_user VARCHAR(255),\n    pass_user VARCHAR(255)\n)\nBEGIN\n    CALL generate_id('users', 'row_id', 'USR', 22, @new_id);\n    SET @last_inserted_id = @new_id;\n    SET @sql = CONCAT(\"INSERT INTO users(row_id, login_user, pass_user) VALUES ('\", \n        @last_inserted_id, \"','\",\n        login_user, \"','\",\n        pass_user, \"')\"\n    );\n    PREPARE stmt FROM @sql;\n    EXECUTE stmt;\n    DEALLOCATE PREPARE stmt;\n\n    # ---- export the new ID before exiting the function\n    SELECT @last_inserted_id AS lastInsertId;\n\nEND;\n$$\n\nDELIMITER ;\n<\/code><\/pre>\n
STEP 3<\/h2>\n
How to use with PHP, for example<\/p>\n
<?php\n\nfunction insert(){\n    $db = $pdo; \/\/ I am using PDO as driver, renewed as Class\n    $lastInsert = null;\n    \/\/---------------\n    $sql = \"CALL insert_users(?,?)\";\n    \/\/---------------\n    \n    $req = $db->prepare($sql);\n    $req->execute($login_user,$pass_user);\n    if($req->rowCount() > 0){\n        $lastInsert = $req->fetch()->lastInsertId;\n        return true;\n    }else{\n        return false;\n    }\n}\n\n?>\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
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solved How to Create an auto-increment value on MySQL using a text field? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] There are many things to solve the problem. Let me show you one of them by using MySQL procedures. Steps are as follows: 1\u00b0) create a procedure that generates an identifier for a table (generate_id) 2\u00b0) create a procedure that inserts the data into the table (insert_users) by using the first procedure (generate_id) to … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[340,339],"class_list":["post-32740","post","type-post","status-publish","format-standard","hentry","category-solved","tag-mysql","tag-php"],"yoast_head":"\n[Solved] How to Create an auto-increment value on MySQL using a text field? 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