JDBC工具类

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 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

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 {  
            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);  
    }  
}  

标签： Mysql 数据库

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