JDBC工具类详解编程语言

1、连接数据库

import java.sql.Connection;   
import java.sql.DriverManager;   
import java.sql.SQLException;   
import java.util.Properties;   
   
/**  
 * 连接数据库  
 *   
 * @author liyulin [email protected]  
 * @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

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 [email protected]  
 * @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 {   
            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);   
    }   
}