JDBC工具类

1、连接数据库

      

package com.society.demo;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

/**
 * 连接数据库
 * 
 * @author liyulin lyl010991@126.com
 * @version 1.0 2015-01-14
 */
public class DBConnection {

    private Connection con = null;
    private String user = "root";
    private String password = "lyl123";
    private String serverIp = "localhost";
    private String database = "test";

    public DBConnection() {

    }

    public DBConnection(String database, String serverIp) {
        this.database = database;
        this.serverIp = serverIp;
    }

    /**
     * 加载驱动 建立数据库连接
     *
     * @throws ClassNotFoundException
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @throws SQLException
     */
    public void connect() throws ClassNotFoundException, InstantiationException, IllegalAccessException, SQLException {
        Properties pr = new Properties();
        pr.put("characterEncoding", "UTF-8");
        pr.put("useUnicode", "TRUE");
        pr.put("user", this.user);
        pr.put("password", this.password);
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        con = DriverManager.getConnection("jdbc:mysql://" + this.serverIp + "/" + this.database, pr);
    }

    /**
     * 关闭连接
     */
    public void disconnect() {
        try {
            if (con != null) {
                con.close();
            }
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }

    /**
     * 获取Connection对象
     */
    public Connection getCon() {
        return con;
    }
}

2、操作数据库

package com.society.demo;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * JDBC工具类
 *
 * @author liyulin lyl010991@126.com
 * @version 1.0 2015-01-14
 */
public class JDBC {

    private DBConnection db = null;
    private Connection conn = null;
    private PreparedStatement ps = null;
    private ResultSet rs = null;

    /**
     * 建立数据库连接
     */
    public Connection connectDB() {
        db = new DBConnection();
        try {
            db.connect();
            conn = db.getCon();
        } catch (Exception ex) {
            Logger.getLogger(JDBC.class.getName()).log(Level.SEVERE, null, ex);
        }
        return conn;
    }

    /**
     * 关闭数据库
     */
    public void closeDB() {
        try {
            if (rs != null) {
                rs.close();
            }
            if (ps != null) {
                ps.close();
            }
            if (conn != null) {
                conn.close();
            }
        } catch (SQLException ex) {
            Logger.getLogger(JDBC.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * 执行一条sql语句（增、删、改）
     *
     * @param sql 插入sql语句
     * @param params sql语句中?所对应的值
     * @return 是否插入成功
     */
    public boolean executeSQL(String sql, Object[] params) {
        boolean tag = false;// 操作是否成功标志
        connectDB();
        try {
            ps = conn.prepareStatement(sql);
            if (null != params) {
                for (int i = 0, paramsSize = params.length; i < paramsSize; i++) {
                    ps.setObject(i + 1, params[i]);
                }
            }
            
            ps.executeUpdate();
            tag = true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            closeDB();
            return tag;
        }
    }

    /**
     * 批量操作（增、删、改）
     *
     * @param sqls 插入sql语句
     * @param objs sql参数（一个二维数组）
     * @return
     */
    public boolean executeBatch(List<String> sqls, Object[][] objs) {
        boolean tag = false;// 批量操作是否成功标志
        connectDB();
        try {
            conn.setAutoCommit(false);
            if (null != objs) {
                // sql参数为null
                for (int i = 0, size = sqls.size(); i < size; i++) {
                    String sql = sqls.get(i);
                    ps = conn.prepareStatement(sql);
                    if (null != objs[i]) {
                        for (int j = 0, paramsSize = objs[i].length; j < paramsSize; j++) {
                            ps.setObject(j + 1, objs[i][j]);
                        }
                    }
                    ps.executeUpdate();
                }
            } else {
                for (int i = 0, size = sqls.size(); i < size; i++) {
                    String sql = sqls.get(i);
                    ps = conn.prepareStatement(sql);
                    ps.executeUpdate();
                }
            }
            conn.commit();
            tag = true;
        } catch (Exception e) {
            try {
                conn.rollback();
            } catch (SQLException ex) {
                Logger.getLogger(JDBC.class.getName()).log(Level.SEVERE, null, ex);
            }
            e.printStackTrace();
        } finally {

<span style="white-space:pre">	</span>    try {
                conn.setAutoCommit(true);
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
            closeDB();
            return tag;
        }
    }

    /**
     * 执行一条插入语句，同时返回插入时的pk
     *
     * @param sql
     * @param params
     * @return pk
     */
    public int insertAndGetPk(String sql, Object[] params) {
        int key = 0;
        connectDB();
        try {
            conn.setAutoCommit(false);
            ps = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
            if (null != params) {
                for (int i = 0, paramsSize = params.length; i < paramsSize; i++) {
                    ps.setObject(i + 1, params[i]);
                }
            }
            ps.executeUpdate();
            ResultSet keys = ps.getGeneratedKeys();
            if (keys.next()) {
                key = keys.getInt(1);
            }
            conn.commit();
        } catch (Exception exception) {
            try {
                conn.rollback();
                exception.printStackTrace();
                return 0;
            } catch (SQLException ex) {
                Logger.getLogger(JDBC.class.getName()).log(Level.SEVERE, null, ex);
            }
        } finally {
            closeDB();
        }
        return key;
    }

    /**
     * 查询
     *
     * @param sql sql语句（参数用“?”）
     * @param params 参数值
     * @return
     */
    public ResultSet query(String sql, Object[] params) {
        try {
            ps = conn.prepareStatement(sql);

            if (null != params) {
                for (int i = 0, paramsSize = params.length; i < paramsSize; i++) {
                    ps.setObject(i + 1, params[i]);
                }
            }
            rs = ps.executeQuery();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return rs;
    }

    public static void main(String[] agrs) {
        List<String> sqls = new ArrayList<String>();
        sqls.add("insert into image(url,title) values(?,?)");
        sqls.add("insert into image(url,title) values('2','222')");
        sqls.add("insert into image(url,title) values(?,?)");
        sqls.add("insert into image(url,title) values(?,?)");
        Object[][] objs = new Object[][]{
            {"1", "111"}, null, {"3", "333"}, {"4", "444"}
        };

        JDBC db = new JDBC();
        boolean tag = db.executeBatch(sqls, objs);
        System.out.println("tag===>" + tag);
    }
}