刚开始接触j2ee的时候总是为数据库的开关连接问题而烦恼,虽然问题很简单却很是琐碎,于是干脆写成一个类将所有必要的基本操作全部总结进去,以后只要轻松的import一下就可以了啊:)菜鸟们enjoying!

import java.sql.Connection;

import java.sql.Statement;

import java.sql.ResultSet;

import java.util.Vector;

public class DBConnection {

//数据库属性

public static String dbDriverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver";

//其他驱动自己填写

public static String dbURL = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName="DBNAME";

public static String dbUserID = "userid";

public static String dbUserPass = "userpassword";

public DBConnection() {

}

public void open() throws Exception{

open( dbDriverName, dbURL, dbUserID, dbUserPass);

}

/**

* 创建一个数据库连接

* @param driver

* JDBC驱动类

* @param url

* 数据库位置

* @param userID

* 数据库登录名

* @param password

* 数据库登录密码

* @throws Exception

* 创建数据库失败

*/

public void open(String driver, String url,

String userID, String password)throws Exception{

close();

Class.forName(driver);

connection = java.sql.DriverManager.getConnection(url, userID, password);

connected = true;

}

/**

* 关闭当前数据库连接

*/

public void close(){

if (connection == null )

return;

try{

if ( !connection.isClosed() )

connection.close();

}catch(Exception e){

}

connected = false;

}

/**

* 判断连接状态

* @return

* 连接返回true,否则返回false;

*/

public boolean isConnected(){

return connected;

}

public void executeInsert (String sql) throws Exception

{

check();

createStatement();

statement.execute(sql);

}

public void executeBatch(Vector sqls)throws Exception{

check();

createStatement();

for( int i = 0; i < sqls.size(); i++ ){

String sql = (String)sqls.get(i);

if ( sql.toLowerCase().trim().startsWith("select")){

throw new Exception("Batch 操作不支持Select操作");

}

statement.addBatch(sql);

}

statement.executeBatch();

}

public ResultSet executeSelect (String sql) throws Exception

{

check();

createStatement();

statement.execute(sql);

return statement.getResultSet();

}

public int executeUpdate (String sql) throws Exception

{

check();

createStatement();

statement.execute(sql);

return statement.getUpdateCount();

}

public int executeDelete (String sql) throws Exception

{

check();

createStatement();

statement.execute(sql);

return statement.getUpdateCount();

}

public void execute (String sql) throws Exception

{

check();

createStatement();

statement.execute(sql);

}

public void beginTrans ()throws Exception

{

check();

connection.setAutoCommit(false);

}

public void commit () throws Exception

{

check();

connection.commit();

}

public void rollback ()

{

try{

connection.rollback();

}catch(Exception e){

}

}

public boolean isConnectioned () throws Exception

{

return connected;

}

protected void check () throws Exception

{

if (!connected)

throw new Exception("没有创建数据库连接");

}

public void createStatement() throws Exception

{

if ( statement == null || connection.getAutoCommit() )

statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,

ResultSet.CONCUR_READ_ONLY);

}

protected Connection connection = null;

protected boolean connected;

protected Statement statement;

}