Den här koden är ganska lång. Jag ber om ursäkt. Den består av två lagrade procedurer. Du kan vara nöjd med att bara springa den första. Den andra använder utdata från den första (datan som den första lämnade i tabeller). Du kanske också vill kombinera koden till en. Men jag höll dem åtskilda. Den andra lagrade processen producerar utdata för att likna describe myTable . Men den utför det för ALLA tabeller i databasen du vill ha sådan utdata.
Du använder detta genom att skicka en parameter (sträng) som databasen ska rapportera om.
Jag skapar en separat databas och koden refererar uttryckligen till tabeller i databasen med namn. Så om du har EXECUTE privilegier till denna lagrade procedur kan du köra den från vilken databas som helst. Så, som ett enkelt test, ställ inte in rapporteringsdatabasen som din nuvarande databas, utan anrop bara den lagrade proceduren efter namn (kvalificerad med rapporteringsdb-namn). Allt detta visas i testdelen nedan.
Två lagrade procedurer
CREATE SCHEMA Reporting101a; -- See **Note1**
DROP PROCEDURE IF EXISTS `Reporting101a`.`describeTables_v2a`;
DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `Reporting101a`.`describeTables_v2a`(
IN dbName varchar(100), -- the dbname to report table structures
OUT theSession int, -- OUT parameter for session# assigned
IN deleteSessionRows BOOL, -- true for delete rows when done from main reporting table for this session#
IN callTheSecondStoredProc BOOL -- TRUE = output is from Pretty output in Second Stored Proc. FALSE= not so pretty output
)
BEGIN
DECLARE thisTable CHAR(100);
DROP TEMPORARY TABLE IF EXISTS Reporting101a.tOutput;
CREATE TEMPORARY TABLE Reporting101a.tOutput
( id int auto_increment primary key,
tblName varchar(100) not null,
ordVal int not null,
cField varchar(100) not null,
cType varchar(100) not null,
cNull varchar(100) not null,
cKey varchar(100) not null,
cDefault varchar(100) null,
cExtra varchar(100) null
);
DROP TEMPORARY TABLE IF EXISTS Reporting101a.tOutput2;
CREATE TEMPORARY TABLE Reporting101a.tOutput2
( tblName varchar(100) primary key,
colCount int not null,
cFieldMaxLen int not null,
cTypeMaxLen int not null,
cNullMaxLen int not null,
cKeyMaxLen int not null,
cDefaultMaxLen int not null,
cExtraMaxLen int not null
);
INSERT Reporting101a.tOutput(tblName,ordVal,cField,cType,cNull,cKey,cDefault,cExtra)
SELECT TABLE_NAME,ORDINAL_POSITION,COLUMN_NAME AS Field, COLUMN_TYPE AS TYPE, RPAD(IS_NULLABLE,4,' ') AS 'Null',
RPAD(COLUMN_KEY,3,' ') AS 'Key',RPAD(COLUMN_DEFAULT,7,' ') AS 'DEFAULT',EXTRA AS Extra
FROM information_schema.columns WHERE table_schema = dbName ORDER BY table_name,ordinal_position;
-- select * from information_schema.columns WHERE table_schema = '57security' order by table_name,ordinal_position;
UPDATE Reporting101a.tOutput
SET cExtra=' '
WHERE cExtra='';
UPDATE Reporting101a.tOutput
SET cField=RPAD(cField,5,' ')
WHERE LENGTH(cField)<5;
INSERT Reporting101a.tOutput2(tblName,colCount,cFieldMaxLen,cTypeMaxLen,cNullMaxLen,cKeyMaxLen,cDefaultMaxLen,cExtraMaxLen)
SELECT tblName,COUNT(*),0,0,0,0,0,0
FROM Reporting101a.tOutput
GROUP BY tblName;
UPDATE tOutput2 t2
JOIN
( SELECT tblName,MAX(LENGTH(cField)) AS mField,MAX(LENGTH(cType)) AS mType,MAX(LENGTH(cNull)) AS mNull,
IFNULL(MAX(LENGTH(cKey)),0) AS mKey,IFNULL(MAX(LENGTH(cDefault)),0) AS mDefault,IFNULL(MAX(LENGTH(cExtra)),0) AS mExtra
FROM Reporting101a.tOutput
GROUP BY tblName
) x
ON x.tblName=t2.tblName
SET t2.cFieldMaxLen=x.mField,t2.cTypeMaxLen=x.mType,cNullMaxLen=x.mNull,
cKeyMaxLen=x.mKey,cDefaultMaxLen=x.mDefault,cExtraMaxLen=x.mExtra;
-- DROP TABLE Reporting101a.reportDataDefsSession; -- useful for quick change of structure of table
-- note, keep above drop call remmed out ! Just use it for quick tweaks to structure
CREATE TABLE IF NOT EXISTS Reporting101a.reportDataDefsSession
( -- for the sole purpose of safe session auto_inc usage
-- Please don't delete unless you want the sessions to experience aberant behavior
sessionId INT AUTO_INCREMENT PRIMARY KEY,
dummy CHAR(1) NOT NULL,
creationDT datetime not null
);
CREATE TABLE IF NOT EXISTS Reporting101a.reportDataDefs
( sessionId INT NOT NULL,
tblName VARCHAR(100) NOT NULL, -- Tablename
ordVal INT NOT NULL, -- the "position number" of the Column
cField VARCHAR(100) NOT NULL, -- The Column
cType VARCHAR(100) NOT NULL, -- Datatype
cNull VARCHAR(100) NOT NULL, -- Nullability
cKey VARCHAR(100) NOT NULL, -- Key info
cDefault VARCHAR(100) NULL, -- Default value
cExtra VARCHAR(100) NULL, -- Extra output
colCount INT NOT NULL, -- the columns here and below are de-normalize data
cFieldMaxLen INT NOT NULL,
cTypeMaxLen INT NOT NULL,
cNullMaxLen INT NOT NULL,
cKeyMaxLen INT NOT NULL,
cDefaultMaxLen INT NOT NULL,
cExtraMaxLen INT NOT NULL
);
-- For lack of a better notion, we are calling calls "sessions". The programmer calls the
-- First Stored Proc, and we call that a session after we get a unique next incrementing number.
-- That number is the session #. House all output with that as a column value. This allows us to
-- move between stored procs, have safe output, have historical snapshots, and retain the data
-- via a session # for later use, whatever use.
INSERT Reporting101a.reportDataDefsSession(dummy,creationDT) VALUES ('X',now());
SET @mySession=LAST_INSERT_ID(); -- there it is, our session # (read the above paragraph)
INSERT Reporting101a.reportDataDefs(sessionId,tblName,ordVal,cField,cType,cNull,cKey,cDefault,cExtra,
colCount,cFieldMaxLen,cTypeMaxLen,cNullMaxLen,cKeyMaxLen,cDefaultMaxLen,cExtraMaxLen)
SELECT @mySession,t1.tblName,t1.ordVal,t1.cField,t1.cType,t1.cNull,t1.cKey,t1.cDefault,t1.cExtra,
t2.colCount,t2.cFieldMaxLen,t2.cTypeMaxLen,t2.cNullMaxLen,t2.cKeyMaxLen,t2.cDefaultMaxLen,t2.cExtraMaxLen
FROM Reporting101a.tOutput t1
JOIN Reporting101a.tOutput2 t2
ON t2.tblName=t1.tblName
ORDER BY t1.tblName,t1.id;
DROP TEMPORARY TABLE Reporting101a.tOutput;
DROP TEMPORARY TABLE Reporting101a.tOutput2;
SET [email protected]; -- the OUT var that came in as a parameter
-- ***************************************************************************
-- ***************************************************************************
-- Label "Some_Sort_of_Output":
IF callTheSecondStoredProc=TRUE THEN
-- The caller says to call the second stored proc (for Pretty Printing)
-- This will generate output similar to `DESCRIBE myTable`
-- But remember, it will do it for EVERY table in referenced database
CALL Reporting101a.`Print_Tables_Like_Describe`(@mySession);
-- The above call just gave you output.
ELSE
-- The caller chose to not auto call the Pretty Printing second stored procedure.
-- Note, the caller can easily call it right after using the OUT parameter.
-- So our output will be a resultset of out reportDataDefs table for this session #
SELECT *
FROM Reporting101a.reportDataDefs
WHERE [email protected]
ORDER BY tblName,ordVal;
END IF;
-- ***************************************************************************
-- ***************************************************************************
IF deleteSessionRows=TRUE THEN
-- The caller says output rows are NOT needed at this point. Delete them.
-- Note, if this boolean comes in TRUE, you can't call Pretty Printing
-- second stored procedure with the session # because the data is gone.
--
-- Regardless, you are getting something back from "Some_Sort_of_Output" above.
DELETE FROM Reporting101a.reportDataDefs
WHERE [email protected];
END IF;
END$$
DELIMITER ;
DROP PROCEDURE IF EXISTS `Reporting101a`.`Print_Tables_Like_Describe`;
DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `Reporting101a`.`Print_Tables_Like_Describe`(
pSessionId INT
)
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE curTable VARCHAR(100) DEFAULT '';
DECLARE bFirst BOOL DEFAULT TRUE;
DECLARE lv_tblName,lv_cField,lv_cType,lv_cNull,lv_cKey,lv_cDefault,lv_cExtra VARCHAR(100);
DECLARE lv_ordVal,lv_colCount,lv_cFieldMaxLen,lv_cTypeMaxLen,lv_cNullMaxLen,lv_cKeyMaxLen,lv_cDefaultMaxLen,lv_cExtraMaxLen INT;
DECLARE cur1 CURSOR FOR SELECT tblName,ordVal,cField,cType,cNull,cKey,cDefault,cExtra,
colCount,cFieldMaxLen,cTypeMaxLen,cNullMaxLen,cKeyMaxLen,cDefaultMaxLen,cExtraMaxLen
FROM Reporting101a.reportDataDefs
WHERE sessionId=pSessionId
ORDER BY tblName,ordVal;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
-- Please note in the above, CURSOR stuff must come last else "Error 1337: Variable or condition decl aft curs"
CREATE TABLE IF NOT EXISTS Reporting101a.reportOutput
( lineNum INT AUTO_INCREMENT PRIMARY KEY,
sessionId INT NOT NULL,
lineOut varchar(100) NOT NULL
);
-- INSERT Reporting101a.reportOutput(sessionId,lineOut)
-- SELECT
-- SET curTable='';
DELETE FROM Reporting101a.reportOutput
WHERE sessionId=pSessionId;
OPEN cur1;
read_loop: LOOP
FETCH cur1 INTO lv_tblName,lv_ordVal,lv_cField,lv_cType,lv_cNull,lv_cKey,lv_cDefault,lv_cExtra,
lv_colCount,lv_cFieldMaxLen,lv_cTypeMaxLen,lv_cNullMaxLen,lv_cKeyMaxLen,lv_cDefaultMaxLen,lv_cExtraMaxLen ;
IF done THEN
LEAVE read_loop;
END IF;
IF lv_tblName<>curTable THEN
IF bFirst=FALSE THEN
INSERT Reporting101a.reportOutput(sessionId,lineOut)
SELECT pSessionId,'';
ELSE
SET bFirst=FALSE;
END IF;
INSERT Reporting101a.reportOutput(sessionId,lineOut)
SELECT pSessionId,lv_tblName;
INSERT Reporting101a.reportOutput(sessionId,lineOut)
SELECT pSessionId,CONCAT('+-',
REPEAT('-',GREATEST(5,lv_cFieldMaxLen)), '-+-',
REPEAT('-',GREATEST(4,lv_cTypeMaxLen)), '-+-',
REPEAT('-',GREATEST(4,lv_cNullMaxLen)), '-+-',
REPEAT('-',GREATEST(3,lv_cKeyMaxLen)), '-+-',
REPEAT('-',GREATEST(7,lv_cDefaultMaxLen)), '-+-',
REPEAT('-',GREATEST(5,lv_cExtraMaxLen)), '-+');
SET @dashLineNumRow=LAST_INSERT_ID();
INSERT Reporting101a.reportOutput(sessionId,lineOut)
SELECT pSessionId,CONCAT('| ',
'Field',
REPEAT(' ',GREATEST(0,lv_cFieldMaxLen-5)), ' | ',
'Type',
REPEAT(' ',GREATEST(0,lv_cTypeMaxLen-4)), ' | ',
'Null',
REPEAT(' ',GREATEST(0,lv_cNullMaxLen-4)), ' | ',
'Key',
REPEAT(' ',GREATEST(0,lv_cKeyMaxLen-3)), ' | ',
'Default',
REPEAT(' ',GREATEST(0,lv_cDefaultMaxLen-7)), ' | ',
'Extra',
REPEAT(' ',GREATEST(0,lv_cExtraMaxLen-5)), ' |');
INSERT Reporting101a.reportOutput(sessionId,lineOut)
SELECT pSessionId,lineOut
FROM Reporting101a.reportOutput
WHERE [email protected];
-- SELECT * FROM Reporting101a.reportDataDefs WHERE sessionId=24;
SET curTable=lv_tblName;
END IF;
INSERT Reporting101a.reportOutput(sessionId,lineOut)
SELECT pSessionId,
CONCAT('| ',
COALESCE(lv_cField,''),
COALESCE(REPEAT(' ',GREATEST(0,lv_cFieldMaxLen-LENGTH(lv_cField))),''),' | ',
COALESCE(lv_cType,''),
COALESCE(REPEAT(' ',GREATEST(0,lv_cTypeMaxLen-LENGTH(lv_cType))),''),' | ',
COALESCE(lv_cNull,''),
COALESCE(REPEAT(' ',GREATEST(0,lv_cNullMaxLen-LENGTH(lv_cNull))),''),' | ',
COALESCE(lv_cKey,' '),
COALESCE(REPEAT(' ',GREATEST(0,lv_cKeyMaxLen-LENGTH(lv_cKey))),''),' | ',
COALESCE(lv_cDefault,' '),
COALESCE(REPEAT(' ',GREATEST(0,lv_cDefaultMaxLen-LENGTH(lv_cDefault))),''),' | ',
COALESCE(lv_cExtra,' '),
COALESCE(REPEAT(' ',GREATEST(0,lv_cExtraMaxLen-LENGTH(lv_cExtra))),''),' |');
INSERT Reporting101a.reportOutput(sessionId,lineOut)
SELECT pSessionId,lineOut
FROM Reporting101a.reportOutput
WHERE [email protected];
END LOOP;
CLOSE cur1;
select lineOut as '' from Reporting101a.reportOutput where sessionId=pSessionId order by lineNum;
END$$
DELIMITER ;
Testa
Testa:
-- See **Note2**
SET @theOutVar =-1; -- A variable used as the OUT variable below
-- See **Note3**
-- Note: with `TRUE` as the 4th parameter, this is a one call deal. Meaning, you are done.
call Reporting101a.describeTables_v2a('stackoverflow',@theOutVar,false,true);
-- See **Note4**
-- Primarily used if the 4th parameter above is false
call Reporting101a.Print_Tables_Like_Describe(@theOutVar); -- loads data for prettier results in chunk format.
Utdata
+--------------------------------------------------------------------------------------------+
| |
+--------------------------------------------------------------------------------------------+
| course |
| +------------+--------------+------+-----+---------+----------------+ |
| | Field | Type | Null | Key | Default | Extra | |
| +------------+--------------+------+-----+---------+----------------+ |
| | courseId | int(11) | NO | PRI | | auto_increment | |
| +------------+--------------+------+-----+---------+----------------+ |
| | deptId | int(11) | NO | MUL | | | |
| +------------+--------------+------+-----+---------+----------------+ |
| | courseName | varchar(100) | NO | | | | |
| +------------+--------------+------+-----+---------+----------------+ |
| |
| dept |
| +----------+--------------+------+-----+---------+----------------+ |
| | Field | Type | Null | Key | Default | Extra | |
| +----------+--------------+------+-----+---------+----------------+ |
| | deptId | int(11) | NO | PRI | | auto_increment | |
| +----------+--------------+------+-----+---------+----------------+ |
| | deptName | varchar(100) | NO | | | | |
| +----------+--------------+------+-----+---------+----------------+ |
| |
| scjunction |
| +------------+---------+------+-----+---------+----------------+ |
| | Field | Type | Null | Key | Default | Extra | |
| +------------+---------+------+-----+---------+----------------+ |
| | id | int(11) | NO | PRI | | auto_increment | |
| +------------+---------+------+-----+---------+----------------+ |
| | studentId | int(11) | NO | MUL | | | |
| +------------+---------+------+-----+---------+----------------+ |
| | courseId | int(11) | NO | MUL | | | |
| +------------+---------+------+-----+---------+----------------+ |
| | term | int(11) | NO | | | | |
| +------------+---------+------+-----+---------+----------------+ |
| | attendance | int(11) | NO | | | | |
| +------------+---------+------+-----+---------+----------------+ |
| | grade | int(11) | NO | | | | |
| +------------+---------+------+-----+---------+----------------+ |
| |
| student |
| +-----------+--------------+------+-----+---------+----------------+ |
| | Field | Type | Null | Key | Default | Extra | |
| +-----------+--------------+------+-----+---------+----------------+ |
| | studentId | int(11) | NO | PRI | | auto_increment | |
| +-----------+--------------+------+-----+---------+----------------+ |
| | fullName | varchar(100) | NO | | | | |
| +-----------+--------------+------+-----+---------+----------------+ |
| |
| testtable |
| +-----------------------------------------+---------------+------+-----+---------+-------+ |
| | Field | Type | Null | Key | Default | Extra | |
| +-----------------------------------------+---------------+------+-----+---------+-------+ |
| | noPKhere | int(11) | NO | | | | |
| +-----------------------------------------+---------------+------+-----+---------+-------+ |
| | veryLongColumnName_And_Then.Some_%_More | decimal(12,2) | YES | | | | |
| +-----------------------------------------+---------------+------+-----+---------+-------+ |
| | limit | int(11) | NO | | | | |
| +-----------------------------------------+---------------+------+-----+---------+-------+ |
| |
| testtable2 |
| +-------+---------+------+-----+---------+-------+ |
| | Field | Type | Null | Key | Default | Extra | |
| +-------+---------+------+-----+---------+-------+ |
| | id | int(11) | NO | PRI | | | |
| +-------+---------+------+-----+---------+-------+ |
+--------------------------------------------------------------------------------------------+
Anmärkning 1 :En databas som heter Reporting101a skapas för att inrymma två lagrade procedurer och några stödtabeller. Dessa rutiner börjar med ett anrop till en lagrad procedur som refererar till databasen som ska rapporteras på med hjälp av en sträng.
Datan för att producera utdata nås via den speciella INFORMATION_SCHEMA databas på ett lässkyddat sätt. Därför berörs inte databasen som rapporteras.
Det finns tre icke-tillfälliga tabeller i denna databas.
reportDataDefsSession- En enkel tabell som används för att få en session#reportDataDefs- data returneras frånINFORMATION_SCHEMAoch masserade lite. Den är sessionsbaserad.reportOutput- En tabell för utskrift som MySQL:sDESCRIBE. Det är bara en tabell för att sätta ihop resultatet. Den är sessionsbaserad.
Anmärkning 2 :Denna INT variabel ingår som en OUT parametermål, skriven till och låter dig kila in din andra kod efter att den första lagrade proceduren förbereder data. Det representerar en session # som isolerar utdata för senare rapportering.
Vissa miljöer som PHP har vissa knep som gör detta till en show-stopper för vissa programmerare. Så om du behöver kombinera båda lagrade procedurerna på egen hand, gör det (eller be mig att göra det separat om du är förvirrad).
I alla fall visar den hur data eller insatser kan Chain Together lagrade proceduranrop.
Ärligt talat en av de främsta anledningarna till att jag kommer ut med en session # som en OUT-parameter är att jag vet att jag måste skapa en CURSOR för att få den vackra utdata. Och det kräver en Cursor DECLARE
överst i en andra lagrad procedur. Och DECLARE s måste förekomma överst i en lagrad procedur. Så med händerna bundna gick jag den här vägen.
Anmärkning 3 :Detta är anropet till den första lagrade proceduren. Det är mycket troligt att du kommer att vara klar efter detta samtal med TRUE som din fjärde parameter. Den lagrade proceduren är ganska väl dokumenterad inuti den. Den 3:e parametern är för om du vill att data ska raderas från rapporttabellen för session #. Raderingen sker efter varje utmatning som en resultatuppsättning. Så detta beror på ditt val.
Parametrar:
- databasnamnet för att beskriva alla tabeller som
describe myTable INTOUTparameter för att hålla sessionen #- boolesk:vill du att data raderas från rapporttabellen i slutet
- boolesk:ska vi automatiskt anropa den lagrade proceduren för vackra utskrifter som genererar
describe-liknande utgång. Om du bestämmer dig för att skicka parameter 4 somFALSE, då kan din utdata likna detta:
Anmärkning 4 :Används i de fall där du vill ha olika utdata men vill att sessionen # ska fungera med. Du behöver vanligtvis inte detta.