抽象工厂模式实现DB的封装(续)

原创

gmllinux 2013-08-22 23:37:57 博主文章分类：j2se ©著作权

文章标签 数据库设计模式封装抽象工厂模式 文章分类 Oracle 数据库

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下午的时候说要用抽象工厂模式封装DB，但是由于晚上电脑出了点问题，所以当时没有贴出代码，现在电脑已经恢复正常，我就把抽象工厂模式封装DB的代码贴出来，供大家参考和点评。

DB.java

package com.gogofun.util;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* 抽象工厂模式的抽象类
* @author GogoFun
*
*/
public abstract class DB {
public static PreparedStatement pstmt = null;
//外部获取驱动字符串
public abstract String getDriverString();
//该方法连接本地服务器,默认端口
public abstract Connection getConnection(String dbName,
String dbUser, String dbPassword);
//该方法连接指定IP服务器，默认端口
public abstract Connection getConnection(String dbIp, String dbName,
String dbUser, String dbPassword);
//该方法连接本地服务器，指定端口
/*public abstract Connection getConnection(String dbPort,String dbName,
String dbUser, String dbPassword);*/
//该方法连接指定IP服务器，指定端口
public abstract Connection getConnection(String dbIp,String dbPort,String dbName,
String dbUser, String dbPassword);
//执行一条SQL Query语句
public static ResultSet executeQuery(Connection conn,String sqlQ) {
if((conn == null)|| (sqlQ == null)) {
return null;
}
try {
pstmt = conn.prepareStatement(sqlQ);
return pstmt.executeQuery();
} catch (SQLException e) {
e.printStackTrace();
close(pstmt);
return null;
}
}
//执行一条ParepredStatement For Query
public static ResultSet executeQuery(Connection conn,PreparedStatement pstmt) {
if((conn == null)|| (pstmt == null)) {
return null;
}
try {
return pstmt.executeQuery();
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
//执行一条SQL Update语句
public static boolean executeUpdate(Connection conn,String sqlU) {
if((conn == null)|| (sqlU == null)) {
return false;
}
try {
pstmt = conn.prepareStatement(sqlU);
pstmt.executeUpdate();
return true;
} catch (SQLException e) {
e.printStackTrace();
close(pstmt);
return false;
}
}
//执行一条ParepredStatement For Update
public static boolean executeUpdate(Connection conn,PreparedStatement pstmt) {
if((conn == null)|| (pstmt == null)) {
return false;
}
try {
pstmt.executeUpdate();
return true;
} catch (SQLException e) {
e.printStackTrace();
return false;
}
}
//关闭连接
public static boolean close (Connection conn) {
try {
if(conn != null) {
conn.close();
conn = null;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
return true;
}
//关闭语句
public static boolean close (Statement stmt) {
try {
if(stmt != null) {
stmt.close();
stmt = null;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
return true;
}
//关闭结果集
public static boolean close (ResultSet rs) {
try {
if(rs != null) {
rs.close();
rs = null;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
return true;
}
}

MysqlDB.java

package com.gogofun.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class MysqlDB extends DB {
private static String driverString = "com.mysql.jdbc.Driver";
private static String connString = "jdbc:mysql://";
private static boolean isInit = false;
private static void init() {
try {
Class.forName(driverString);
isInit = true;
} catch (ClassNotFoundException e) {
e.printStackTrace();
isInit = false;
}
}
@Override
public String getDriverString() {
return driverString;
}
@Override
public Connection getConnection(String dbName, String dbUser,
String dbPassword) {
if (!isInit) {
init();
}
String connStr = connString + "localhost:3306/" + dbName + "?user=" + dbUser
+ "&password=" + dbPassword;
try {
return DriverManager.getConnection(connStr);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
@Override
public Connection getConnection(String dbIp, String dbName, String dbUser,
String dbPassword) {
if (!isInit) {
init();
}
String connStr = connString + dbIp + ":3306/" + dbName + "?user=" + dbUser
+ "&password=" + dbPassword;
try {
return DriverManager.getConnection(connStr);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
@Override
public Connection getConnection(String dbIp, String dbPort, String dbName,
String dbUser, String dbPassword) {
if (!isInit) {
init();
}
String connStr = connString + dbIp + ":" + dbPort + "/" + dbName + "?user=" + dbUser
+ "&password=" + dbPassword;
try {
return DriverManager.getConnection(connStr);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
}

OracleDB.java

package com.gogofun.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class OracleDB extends DB {
private static String driverString = "oracle.jdbc.driver.OracleDriver";
private static String connString = "jdbc:oracle:this:@";
private static boolean isInit = false;
private static void init() {
try {
Class.forName(driverString);
isInit = true;
} catch (ClassNotFoundException e) {
e.printStackTrace();
isInit = false;
}
}
@Override
public String getDriverString() {
return driverString;
}
@Override
public Connection getConnection(String dbName, String dbUser,
String dbPassword) {
if (!isInit) {
init();
}
try {
String connStr = connString + "localhost:1521:" + dbName;
return DriverManager.getConnection(connStr,dbUser,dbPassword);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
@Override
public Connection getConnection(String dbIp, String dbName, String dbUser,
String dbPassword) {
if (!isInit) {
init();
}
try {
String connStr = connString + dbIp + ":1521:" + dbName;
return DriverManager.getConnection(connStr,dbUser,dbPassword);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
@Override
public Connection getConnection(String dbIp, String dbPort, String dbName,
String dbUser, String dbPassword) {
if (!isInit) {
init();
}
try {
String connStr = connString + dbIp + ":" + dbPort +":" + dbName;
return DriverManager.getConnection(connStr,dbUser,dbPassword);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
}