package com.sunshine.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DB {
public static Connection getConnection() {
Connection conn = null;
//1.註冊驅動
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
System.out.println("驅動異常!");
e.printStackTrace();
}
//2.獲取連接
try {
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/miaoling","root","901106");
} catch (SQLException e) {
// TODO Auto-generated catch block
System.out.println("getConnection異常!");
e.printStackTrace();
}
return conn;
}
//sql:insert,update,delete
public static int executeUpdate(String sql) {
Connection conn = DB.getConnection();
Statement stmt = null;
try {
stmt = conn.createStatement();
} catch (SQLException e) {
// TODO Auto-generated catch block
System.out.println("createStatement異常!");
e.printStackTrace();
}
int result = 0;
try {
result = stmt.executeUpdate(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("executeUpdate異常!");
}
DB.close(conn, stmt, null);
return result;
}
public static Statement getStatement(Connection conn) {
try {
return conn.createStatement();
} catch (SQLException e) {
// TODO Auto-generated catch block
System.out.println("createStatement異常!");
e.printStackTrace();
}
return null;
}
//sql:select
public static ResultSet executeQuery(Connection conn,Statement stmt,String sql) {
ResultSet rs = null;
try {
rs = stmt.executeQuery(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
System.out.println("executeQuery異常!");
e.printStackTrace();
}
return rs;
}
public static void close(Connection conn,Statement stmt,ResultSet rs){
if (rs!=null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt!=null){
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn!=null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}