JDBC

package com.xcgdt.template;

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

import com.mysql.jdbc.Driver;

public class BaseDao {
    private static String drive_class = "com.mysql.jdbc.Driver";
    private static String url = "jdbc:mysql://localhost:3306/train?useUnicode=true&characterEncoding=utf-8";
    private static String user = "root";
    private static String password = "shell_girl";

    //加载驱动
    static {
        try {
            Class.forName(drive_class);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

    }

    /**
     * 连接数据库
     *
     * @param sql
     * @return
     */
    public Connection getConnection() {
        try {
            Connection conn = DriverManager.getConnection(url, user, password);
            return conn;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 执行增删改
     *
     * @param sql
     * @param pramas
     * @return
     */

    public ResultSet executeQuery(String sql, Object... pramas) {
        Connection conn = this.getConnection();
        PreparedStatement stmt = null;
        try {
            stmt = conn.prepareStatement(sql);
            if (pramas != null && pramas.length != 0) {
                for (int i = 0; i < pramas.length; i++) {
                    stmt.setObject(i + 1, pramas[i]);
                }
            }
            ResultSet rs = stmt.executeQuery();
            return rs;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }


    /**
     * 执行增删改
     *
     * @param sql
     * @param pramas
     * @return
     */
    public int executeUpdate(String sql, Object... pramas) {
        Connection conn = this.getConnection();
        PreparedStatement pstmt = null;
        try {
            int result = 0;
            pstmt = conn.prepareStatement(sql);
            if (pramas != null && pramas.length != 0) {
                for (int i = 0; i < pramas.length; i++) {
                    pstmt.setObject(i + 1, pramas[i]);
                }
            }
            result = pstmt.executeUpdate();
            return result;
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            this.closeAll(pstmt, null, conn);
        }
        return 0;
    }


    /**
     * 释放资源
     *
     * @param stmt
     * @param rs
     * @param conn
     */
    public void closeAll(Statement stmt, ResultSet rs, Connection conn) {
        try {
            if (stmt != null) {
                stmt.close();
                stmt = null;
            }
            if (rs != null) {
                rs.close();
                rs = null;
            }
            if (conn != null && conn.isClosed() == false) {
                conn.close();
                conn = null;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}