de.uni_leipzig.asv.util.commonDB

Class DBFunctions

java.lang.Object

de.uni_leipzig.asv.util.commonDB.DBFunctions

public class DBFunctions
extends Object

This class organizes the DB specific Functions. You can establish a connection to a DB, execute queries and finaly close the connection.

Author:

Daniel Zimmermann, Torsten Thalheim, Volker Boehlke

Constructor Summary

Constructors

Constructor and Description
DBFunctions(String driverClass, String dbUrl, String userid, String passwd, boolean isSwing) This default constructor establishes a connection to a DB.

Method Summary

Methods

Modifier and Type	Method and Description
void	closeCon() This method finally closes the connection to a DB.
void	Commit() This method is to commit statements, when you've swiched of the auto-commit.
ResultSet	execStmt(String query) This method is used for querys which returns a result, like the SELECT statements
Connection	getConnection()
boolean	getIsSwing()
PreparedStatement	getPreparedStmt(String query) If you want to use prepared statements instead of ordinary statements you can create one.
int	insertStmt(String query) This method can perform queries which havn't a result, such as INSERT statements.
void	rollBack() When auto-commit is switched off, you can do a rollback in the case of some errors...
void	setAutoCommit(boolean b) This method is to specifie whether or not you want to use auto-commit.
void	setIsSwing(boolean isSwing)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DBFunctions

public DBFunctions(String driverClass,
           String dbUrl,
           String userid,
           String passwd,
           boolean isSwing)

This default constructor establishes a connection to a DB.

Parameters:

driverClass - the driver class needed to connect to the DB

dbUrl - the URL of the DB you want to connect with

userid - the user who have to connect to the DB

passwd - the users password - witout it - no connection

Method Detail

setIsSwing

public void setIsSwing(boolean isSwing)

getIsSwing

public boolean getIsSwing()

getConnection

public Connection getConnection()

execStmt

public ResultSet execStmt(String query)

This method is used for querys which returns a result, like the SELECT statements

Parameters:

query - the SQL-query to execute on the DB

Returns:

a ResultSet

insertStmt

public int insertStmt(String query)

This method can perform queries which havn't a result, such as INSERT statements.

Parameters:

query - the INSERT query

Commit

public void Commit()

This method is to commit statements, when you've swiched of the auto-commit.

setAutoCommit

public void setAutoCommit(boolean b)

This method is to specifie whether or not you want to use auto-commit.

Parameters:

b - true if you want to use auto-commit, else false

rollBack

public void rollBack()

When auto-commit is switched off, you can do a rollback in the case of some errors...

closeCon

public void closeCon()

This method finally closes the connection to a DB.

getPreparedStmt

public PreparedStatement getPreparedStmt(String query)

If you want to use prepared statements instead of ordinary statements you can create one.

Parameters:

query - the query you want to save as a prepared statement

Returns:

the prepared statement, ready to use