package com.qingruxu.db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class db {
public db()
{
Connection conn=null;
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("加载驱动成 功");
try {
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/php2?user=root&password=1");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(" 得到数据库连接成功");
PreparedStatement prstmt=null;
Statement stmt=null;
ResultSet rs=null;
// 普通会话
String sql="select * from admin ;";
try {
stmt=conn.createStatement();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println(" 创建会话成功");
try {
rs=stmt.executeQuery(sql);
while(rs.next())
{
System.out.println(rs.getString("userid"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 预编译的会话
sql="select * from admin where aid=?;";
try {
prstmt=conn.prepareStatement(sql);
prstmt.setInt(1, 1);
rs=prstmt.executeQuery();
while(rs.next())
{
System.out.println(rs.getString("userid"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
if(rs!=null)
try {
rs.close();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
if(prstmt!=null)
try {
prstmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(conn!=null)
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new db();
}
}