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 java and MySQL

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Moti Barski


Posts : 111
Join date : 2011-08-02

PostSubject: java and MySQL   Sun Apr 15, 2018 8:57 pm

mySQL the database
mySQL workbench : a GUI for CRUDing sql DBs
connectorJ : enables java platforms to work with sql DBs

mySQL installer : a package with the above 3

DL said installer from :
choose the community DL (mySql-installer-community- and fire it up.

on the wizard choose: custom, mySQL server 5.7_mySQL server 5.7.21 - x64 + applications mySql workbench,
standalone mtSql server/classic, config type : development machine tcp/ip open +firewall+ port 3306,
invent pass, config mysql as win service + start server at sys startup + run service as standard

in the workbench creating a DB and table in it is right click intuitive.
PK : primary key FK (foriegn key): the PK parallal in a 2nd DB. therefor an FK can not be null.
those keys are used for join methods which are used for displaying the fusion between DBs.

you need to refresh after queries there is a refresh button in the SQL explorer window near the DB.


aggerate functiokns

MySQL query conjurations :

select * from testdb1.testtable;
select * from databeName.someTableName;

--this is a comment
mysql aggregate functions :

stored methodes :

A stored procedure is a set of SQL statements that can be stored in the server.
1 situations where stored routines can be particularly useful:
2 when security is paramount

When the routine is invoked, an implicit USE db_name is performed (and undone when the routine terminates). USE statements within stored routines are disallowed.
You can qualify routine names with the database name. This can be used to refer to a routine that is not in the current database. For example, to invoke a stored procedure p or function f that is associated with the test database, you can say CALL test.p() or test.f().
When a database is dropped, all stored routines associated with it are dropped as well.

strored methodes

join queries

ready made example DB for practice : northwind :
run this query (in the mysql workbench) to create it :
run this query to populate it with data


Last edited by Moti Barski on Mon Apr 23, 2018 12:08 am; edited 2 times in total
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