oracle.jsp.dbutil
Class ConnBean

java.lang.Object
  |
  +--oracle.jsp.dbutil.ConnBean

public class ConnBean

extends java.lang.Object

implements JspScopeListener

A Bean to open a database connection. Can enable statement caching and set properties like Row Prefetch and Execute Update Batch Size. Mechanism to create all kinds of statements is also provided.

Bean Properties that can be set and retrieved :

User - user name for connection

Password password for connection

URL URL for database connection

StmtCacheSize Enable and set the statement cache size

ExecuteBatch Execute Batch Size for DMLs

PreFetch Row prefetch size for the rows returned for queries.

Field Summary

protected java.sql.Connection

m_conn

Constructor Summary

ConnBean()

Method Summary

void	close() Close the database connection and any opened cursors.
void	connect() Establish a database connection with the user name, password and URL set before.
java.sql.Connection	getConnection() Get the underlying connection object.
CursorBean	getCursorBean(int stype, java.lang.String sql) Creates a cursor and returns a CursorBean.
int	getExecuteBatch() Get the execute batch size for this connection bean.
java.lang.String	getPassword() Get the password for this connection bean.
int	getPreFetch() Get the Row prefetch size for this connection bean.
int	getStmtCacheSize() Get the statement cache size set for this connection bean.
java.lang.String	getURL() Get the URL for this connection bean.
java.lang.String	getUser() Get the user name for this connection bean.
void	outOfScope(JspScopeEvent ae) Invoked when a JSP scope that this object is attached to is ending.
void	setExecuteBatch(int bsize) Set the Execute Batch Size for DMLs.
void	setPassword(java.lang.String password) Set the password with which connections have to be obtained.
void	setPreFetch(int prefSize) Set the Row prefetch size for the rows returned for queries.
void	setStmtCacheSize(int scsize) Enable and set the statement cache size.
void	setURL(java.lang.String url) Set the URL from which connections have to be obtained.
void	setUser(java.lang.String user) Set the user name with which connections have to be obtained.

Methods inherited from class java.lang.Object

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

Field Detail

m_conn

protected java.sql.Connection m_conn

Constructor Detail

ConnBean

public ConnBean()

Method Detail

setUser

public void setUser(java.lang.String user)

Set the user name with which connections have to be obtained.

Parameters:

user - Username to be set.

getUser

public java.lang.String getUser()

Get the user name for this connection bean. Returns null if not set.

Returns:

user name for this connection bean.

setPassword

public void setPassword(java.lang.String password)

Set the password with which connections have to be obtained.

Parameters:

password - Passowrd to be set.

getPassword

public java.lang.String getPassword()

Get the password for this connection bean. Returns null if not set.

Returns:

password for this connection bean.

setURL

public void setURL(java.lang.String url)

Set the URL from which connections have to be obtained.

Parameters:

url - URL to be set.

getURL

public java.lang.String getURL()

Get the URL for this connection bean. Returns null if not set.

Returns:

URL for this connection bean.

connect

public void connect()
             throws java.sql.SQLException

Establish a database connection with the user name, password and URL set before.

Throws:

java.sql.SQLException - if a database-access error occurs.

close

public void close()
           throws java.sql.SQLException

Close the database connection and any opened cursors. Also, frees up all the resources consumed by this connection.

Throws:

java.sql.SQLException - if a database-access error occurs.

getConnection

public java.sql.Connection getConnection()

Get the underlying connection object.

Returns:

JDBC Connection Object

getCursorBean

public CursorBean getCursorBean(int stype,
                                java.lang.String sql)
                         throws java.sql.SQLException

Creates a cursor and returns a CursorBean. Sql is ignored if it's a Plain Statement.

Parameters:

stype - Statement Type. Possible values are

• CursorBean.PLAIN_STMT : For Plain Statements
• CursorBean.PREP_STMT : For Prepared Statement
• CursorBean.CALL_STMT : For Callable Statements

sql - Sql string to be executed

Returns:

CursorBean Object

Throws:

java.sql.SQLException - if cursor creation fails.

setPreFetch

public void setPreFetch(int prefSize)

Set the Row prefetch size for the rows returned for queries.

Parameters:

prefSize - prefetch size

getPreFetch

public int getPreFetch()

Get the Row prefetch size for this connection bean.

Returns 10 (default) if not set.

Returns:

Row prefetch size for this connection bean.

setExecuteBatch

public void setExecuteBatch(int bsize)

Set the Execute Batch Size for DMLs.

Parameters:

bsize - Execute Batch Size

getExecuteBatch

public int getExecuteBatch()

Get the execute batch size for this connection bean.

Returns 1 (default) if not set.

Returns:

execute batch size for this connection bean.

setStmtCacheSize

public void setStmtCacheSize(int scsize)
                      throws java.sql.SQLException

Enable and set the statement cache size. Set the size to 0 to diable statement caching. Cursor caching is based on LRU policy with max size scsize .

Parameters:

scsize - Statement Cache Size

Throws:

java.sql.SQLException - An error occurred while enabling caching.

getStmtCacheSize

public int getStmtCacheSize()

Get the statement cache size set for this connection bean. Returns 0 if not set. Zero is the default value

Returns:

statement cache size for this connection bean.

outOfScope

public void outOfScope(JspScopeEvent ae)

Description copied from interface: JspScopeListener

Invoked when a JSP scope that this object is attached to is ending.

Specified by:

outOfScope in interface JspScopeListener