新浪云web项目数据库连接及 封装

【重点】Class.forName("com.mysql.jdbc.Driver");//数据库连接语句声明

conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bbs","root","root"); //本地mysql数据库JDBC连接语句（项目名bbs登录名root密码root）
conn = DriverManager.getConnection("jdbc:mysql://w.rdc.sae.sina.com.cn:3307/app_xiaoweibbs","0ww4ox1l0n","4ik4i5jkwwmxij0lyjl3hmlx3kkyyi1ii10iih23");
//新浪云mysql数据库JDBC连接语句（云数据库地址和端口固定“w.rdc.sae.sina.com.cn:3307”web应用名称前面要加上app_ 然后找到web应用设置类似0ww4ox1l0n的数据库登录名和类似[b]4ik4i5jkwwmxij0lyjl3hmlx3kkyyi1ii10iih23[/b]这样的数据库登录密码）
【一】下面是我自己的bbs数据库的封装代码:
package com.bjsxt.bbs; //包名要记得改掉

import com.mysql.jdbc.Statement;
import java.sql.*;

public class DB {
public static Connection getConn(){
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
//conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bbs","root","root");

conn = DriverManager.getConnection("jdbc:mysql://w.rdc.sae.sina.com.cn:3307/app_xiaoweibbs","0ww4ox1l0n","4ik4i5jkwwmxij0lyjl3hmlx3kkyyi1ii10iih23");

} catch (ClassNotFoundException e) {
e.printStackTrace();
}catch (SQLException e) {
e.printStackTrace();
e.printStackTrace();
}
return conn;

}

public static Statement createStmt(Connection conn){
Statement stmt = null;
try {
stmt = (Statement) conn.createStatement();
} catch (SQLException e){
e.printStackTrace();
}
return stmt;
}

public static ResultSet ExceruQuery(Statement stmt,String sql){
ResultSet rs = null;
try {
rs = stmt.executeQuery(sql);
} catch (SQLException e) {
e.printStackTrace();
}
return rs;
}

public static int executeUpdate(Connection conn,String sql){
int ret = 0;
Statement stmt = null;
try{
stmt = (Statement) conn.createStatement();
ret = stmt.executeUpdate(sql);
}catch(SQLException e){
e.printStackTrace();
} finally {
close(stmt);
}
return ret;
}

public static void close(Connection conn){
if(conn != null){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
conn = null;
}
public static void close(Statement stmt){
if(stmt != null){
try {
stmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
stmt = null;
}
public static void close(ResultSet rs){
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
rs = null;
}

public static PreparedStatement PreparedStmt(Connection conn,String sql){
PreparedStatement pstmt =null;
try {
pstmt = conn.prepareStatement(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return pstmt;
}
public static PreparedStatement PreparedStmt(Connection conn,String sql,int autoGeneratedKeys){
PreparedStatement pstmt =null;
try {
pstmt = conn.prepareStatement(sql,autoGeneratedKeys);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return pstmt;
}
public static void close(PreparedStatement pstmt){
if(pstmt != null){
try {
pstmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
pstmt = null;
}
}