【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","4ik4i5jkwwmxij0lyjl3hmlx3kkyyi1ii10iih33");
//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4ik4i5jkwwmxij0lyjl3hmlx3kkyyi1ii10iih33这样的数据库登录密码）
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","4ik4i5jkwwmxij0lyjl3hmlx3kkyyi1ii10iih33");
} 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;
}
}
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