android 学习

DBUtil层

package com.lunwen.DBUtil;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUtil {
    
    public static String db_url = "jdbc:mysql://localhost:3306/stu?useUnicode=true&characterEncoding=utf8";
    public static String db_user = "root";
    public static String db_pass = "20194015";
    
    public static Connection getConn () {
        Connection conn = null;
        
        
        try {
                        Class.forName("com.mysql.jdbc.Driver");
            
            conn = DriverManager.getConnection(db_url, db_user, db_pass);
            
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return conn;
    }
    public static void main(String[] args) {
        getConn();
    }
    
    /**
     * @param state
     * @param conn
     */
    public static void close (Statement state, Connection conn) {
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static void close (ResultSet rs, Statement state, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}