JDBCUtils

package database;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * <p>
 * Description:JDBCUtils工具类
 * </p>
 * 
 * @author Administrator
 * @date 2018年11月4日下午2:12:10
 */
public class JDBCUtils {
    public static final String DRIVER = "com.mysql.jdbc.Driver";
    public static final String url = "jdbc:mysql://localhost:3306/jdbctest";
    public static final String user = "root";
    public static final String password = "root";
    private static Connection conn;

    static {
        try {
            Class.forName(DRIVER);
        } catch (ClassNotFoundException e) {
            System.out.println("数据库驱动注册失败！");
        }
    }

    // 提供获取连接方法
    public static Connection getConnection() throws SQLException {
        // 获得连接
        conn = DriverManager.getConnection(url, user, password);
        // 返回连接
        return conn;
    }

    // 关闭资源
    public static void close(Connection conn, Statement stmt) {
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    // 关闭资源
    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();
            }
        }
    }
}