Category Archives: MySQL-Scripts

MySQL related blog posts with scripts

13 Sep

MySQL function returns dates of specified day & between date range

This mysql stored function will return you all the dates between given dates having specified day.
In short if you say: give me all Sundays in this month.

I have following for you:

mysql> select Give_Me_Dates_Days(1,'2012-09-01','2012-10-01') as All_Sundays;
+--------------------------------------------------------+
| All_Sundays |
+--------------------------------------------------------+
| 2012-09-02,2012-09-09,2012-09-16,2012-09-23,2012-09-30 |
+--------------------------------------------------------+

The function parameters are as follows: Give_Me_Dates_Days(DAY_IDENTIFIER,START_DATE,END_DATE)

Sunday = 1 (and rest you can figure-out).
Continue Reading…

05 Jul

Generate random test data for MySQL using routines

At times you’ll find yourself responsible for generating test data for newly created tables for testing or sampling purpose. There are tools that will generate random data for you but they’re not free. At-times you’ll write scripts to generate data but those will be table specific.

I hate generating dummy data, yes I do and I assume you do too! I think that’s the major reason I wrote these MySQL functions and procedures for Generating dummy test data.
Continue Reading…

16 Sep

MySQL Function to Convert Date To Words

Recently I saw a MySQL Stored Function requirement on Experts-Exchange for converting date into some specific words format.
You may find MySQL function for date to words conversion online; even udfs might be ready, but I decided to write my own.
I wrote this simple function mainly based on SELECT CASE to convert dates in to words as follows:

mysql>SELECT date_to_words(‘2010-05-08′);
Eighth Day of May Two Thousand Ten

Download sql file below the code.

DELIMITER $$

DROP FUNCTION IF EXISTS `date_to_words` $$
CREATE FUNCTION `date_to_words` (mydate DATE) RETURNS VARCHAR(100)
DETERMINISTIC
BEGIN

/* Converts date into words */

DECLARE yr INT;
DECLARE dateval INT;
DECLARE thousand INT;
DECLARE hundred INT;
DECLARE tens INT;

DECLARE tensword VARCHAR(10);
DECLARE onesword VARCHAR(10);
DECLARE thousandsword VARCHAR(20);
DECLARE hundredsword VARCHAR(20);
DECLARE datevalsword VARCHAR(20);

SET yr=year(mydate);
SET dateval=day(mydate);

/* DAY TO WORDS */

SELECT CASE dateval
WHEN 1 THEN ‘First’
WHEN 2 THEN ‘Second’
WHEN 3 THEN ‘Third’
WHEN 4 THEN ‘Fourth’
WHEN 5 THEN ‘Fifth’
WHEN 6 THEN ‘Sixth’
WHEN 7 THEN ‘Seventh’
WHEN 8 THEN ‘Eighth’
WHEN 9 THEN ‘Ninth’
WHEN 10 THEN ‘Tenth’
WHEN 11 THEN ‘Eleventh’
WHEN 12 THEN ‘Twelfth’
WHEN 13 THEN ‘Thirteenth’
WHEN 14 THEN ‘Fourteenth’
WHEN 15 THEN ‘Fifteenth’
WHEN 16 THEN ‘Sixteenth’
WHEN 17 THEN ‘Seventeenth’
WHEN 18 THEN ‘Eighteenth’
WHEN 19 THEN ‘Nineteenth’
WHEN 20 THEN ‘Twentieth’
WHEN 21 THEN ‘Twenty-first’
WHEN 22 THEN ‘Twenty-second’
WHEN 23 THEN ‘Twenty-third’
WHEN 24 THEN ‘Twenty-fourth’
WHEN 25 THEN ‘Twenty-fifth’
WHEN 26 THEN ‘Twenty-sixth’
WHEN 27 THEN ‘Twenty-seventh’
WHEN 28 THEN ‘Twenty-eighth’
WHEN 29 THEN ‘Twenty-ninth’
WHEN 30 THEN ‘Thirtieth’
WHEN 31 THEN ‘Thirty-first’
END into datevalsword;

/* YEAR TO WORDS */
set thousand=floor(yr/1000) ;
set yr = yr – thousand * 1000;
set hundred = floor(yr / 100);
set yr = yr – hundred * 100;

IF (yr > 19) THEN
set tens = floor(yr / 10);
set yr = yr mod 10;
ELSE
set tens=0;
END IF;

SELECT CASE thousand
WHEN 1 THEN ‘One’
WHEN 2 THEN ‘Two’
WHEN 3 THEN ‘Three’
WHEN 4 THEN ‘Four’
WHEN 5 THEN ‘Five’
WHEN 6 THEN ‘Six’
WHEN 7 THEN ‘Seven’
WHEN 8 THEN ‘Eight’
WHEN 9 THEN ‘Nine’
END INTO thousandsword;
SET thousandsword=concat(thousandsword,’ Thousand ‘);

SELECT CASE hundred
WHEN 0 then ”
WHEN 1 THEN ‘One’
WHEN 2 THEN ‘Two’
WHEN 3 THEN ‘Three’
WHEN 4 THEN ‘Four’
WHEN 5 THEN ‘Five’
WHEN 6 THEN ‘Six’
WHEN 7 THEN ‘Seven’
WHEN 8 THEN ‘Eight’
WHEN 9 THEN ‘Nine’
END INTO hundredsword;
if (hundredsword<>”) then
SET hundredsword=concat(hundredsword,’ Hundred ‘) ;
else
set hundredsword=”;
end if;

/*TENS To WORDS*/
SELECT CASE tens
WHEN 2 THEN ‘Twenty’
WHEN 3 THEN ‘Thirty’
WHEN 4 THEN ‘Fourty’
WHEN 5 THEN ‘Fifty’
WHEN 6 THEN ‘Sixty’
WHEN 7 THEN ‘Seventy’
WHEN 8 THEN ‘Eigthy’
WHEN 9 THEN ‘Ninety’
ELSE ”
END INTO tensword;

/*ONES To WORDS*/
SELECT CASE yr
WHEN 0 THEN ”
WHEN 1 THEN ‘One’
WHEN 2 THEN ‘Two’
WHEN 3 THEN ‘Three’
WHEN 4 THEN ‘Four’
WHEN 5 THEN ‘Five’
WHEN 6 THEN ‘Six’
WHEN 7 THEN ‘Seven’
WHEN 8 THEN ‘Eight’
WHEN 9 THEN ‘Nine’
WHEN 10 THEN ‘Ten’
WHEN 11 THEN ‘Eleven’
WHEN 12 THEN ‘Twelve’
WHEN 13 THEN ‘Thirteen’
WHEN 14 THEN ‘Fourteen’
WHEN 15 THEN ‘Fifteen’
WHEN 16 THEN ‘Sixteen’
WHEN 17 THEN ‘Seventeen’
WHEN 18 THEN ‘Eighteen’
WHEN 19 THEN ‘Nineteen’
END into onesword;

return concat(datevalsword, ‘ Day of ‘, date_format(mydate,’%M’),’ ‘,thousandsword,hundredsword, tensword,’ ‘,onesword);
END $$

DELIMITER ;

Download SQL Code for converting date to words.date_to_words.sql

05 May

MySQL Stored procedure to Generate-Extract Insert Statement

A lot of places I saw people asking for ways to generate Insert statements.

We do have GUI Tools which can extract insert statements for us readily. of the time I choose the MySQLDump way to generate insert statements.

mysqldump -uroot -ppassword –complete-insert –no-create-info DATABASE TABLENAME > TABLENAME.sql

But mind is very unstable and hungry, we don’t stop at one solution.
So to remove my mind’s starvation for the Stored Procedure way to extract Insert statement I created following routine.

As you can see this is really a simple procedure revolves around Information_schema mainly to get details of any table and then fires the simple sql query.

The procedure I named: InsGen
Input parameters:

in_db: Database name of the table for which you want to generate insert statements
in_table: Tabel name
in_file: complete file path [eg: C:/mysqlInserts.sql or /var/lib/data/mysqlInserts.sql]

DELIMITER $$

DROP PROCEDURE IF EXISTS `InsGen` $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `InsGen`(in_db varchar(20),in_table varchar(20),in_file varchar(100))
BEGIN

declare Whrs varchar(500);
declare Sels varchar(500);
declare Inserts varchar(2000);
declare tablename varchar(20);

set tablename=in_table;
select tablename;
# Comma separated column names – used for Select
select group_concat(concat(‘concat(\'”\’,’,’ifnull(‘,column_name,’,””)’,’,\'”\’)’)) INTO @Sels from information_schema.columns where table_schema=in_db and table_name=tablename;

# Comma separated column names – used for Group By
select group_concat(‘`’,column_name,’`’) INTO @Whrs from information_schema.columns where table_schema=in_db and table_name=tablename;

#Main Select Statement for fetching comma separated table values
set @Inserts=concat(“select concat(‘insert into “, in_db,”.”,tablename,” values(‘,concat_ws(‘,’,”,@Sels,”),’);’) from “, in_db,”.”,tablename,” group by “,@Whrs, ” INTO OUTFILE ‘”, in_file ,”‘”);

PREPARE Inserts FROM @Inserts;
EXECUTE Inserts;

END $$

DELIMITER ;

Sample output:

Generate-Inserts-mysql

Generate Inserts mysql

Download sql script to generate insert statements: InsGen.sql

I have not considered each and every scenarios yet, but this works for normal tables and it does error if file exists.
My mind is no more hungry atleast in this regard.

I hope it helps.

08 Apr

MySQL Load Data Infile Syntax Generator Tool Download

The LOAD DATA INFILE statement reads rows from a text file into a table at a very high speed. The file name must be given as a literal string.

I have already written the basic how to follow that considering additional cases.

A lot of questions I have seen for loading separated data to MySQL, so here I’ve created a very beginner level excel tool that will allow you to generate the LOAD DATA syntax as per your choices.
Presently sample table name and field/line separators are specified, which you may alter as per your own file.

Load-data-syntax-v1.0

Load-data-syntax-v1.0

Download the sheet here: Load Data

Load Data Syntax:

Options column specifies options that are required for syntaxes generation.
Under Selection column you will choose your option while under Description column, for each Option description is provided.

Using basic knowledge of load data you can quite easily generate the syntax by specifying option, choosing file to be loaded and finally clicking the Syntax button.

Please refer the syntax on MySQL documentation as well.

This is a “early release”, please check for the updates.
If you have any suggestions or bug report please comment / mail.

Thanks.

-- Kedar Vaijanapurkar --