微软自带jdbc驱动缺陷

微软自带的3个驱动包分别为：msbase.jar，mssqlserver.jar，msutil.jar
微软驱动的缺点：
（1）如果采用jdbc-odbc驱动，那么就必须按照查询顺序来一次读取（不论有没有image或text类型）
（2）如果采用微软提供的ms sql server jdbc driver，如果查询语句中，不存在image或text类型字段，那么可以按照无序获取
（3）如果采用微软提供的ms sql server jdbc driver，如果查询语句中，存在image或text类型字段，那么就必须按照顺序读取，否则就会报告Driver]ResultSet can not re-read row data for column之类的错误
测试方法和代码如下：
数据库表：TestTable
    表字段及类型：
         guid char(38)
         title varchar(100)
         content Text
         username varchar(20)

public static void main(String[] args) {
		// TODO Auto-generated method stub
		String url = "jdbc:microsoft:sqlserver://192.168.5.20:1435;DatabaseName=emos2.2";
		String driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
		try {
			Class.forName(driver);
			Connection conn = DriverManager.getConnection(url, "sa", "1234");
			if (conn.isClosed() == true) {
				System.out.println("SomeThing   goes   wrong ");
			}
			PreparedStatement st = conn.prepareStatement("select * from TestTable");
			ResultSet rs = st.executeQuery();
			while(rs.next()){
				System.out.println(rs.getString("guid"));
				System.out.println(rs.getString("username"));
				System.out.println(rs.getBinaryStream("content"));
				
			}
		} catch (ClassNotFoundException e) {
			System.out.println("SomeThing     wrong ");
			System.out.println(e);
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

   而第三方的驱动jtds1.2很好的解决了这些bug

public static void main(String[] args) {
		String url = "jdbc:jtds:sqlserver://192.168.5.20:1435/emos2.2";
		String driver = "net.sourceforge.jtds.jdbc.Driver";
		try {
			Class.forName(driver);
			Connection conn = DriverManager.getConnection(url, "sa", "1234");
			if (conn.isClosed() == true) {
				System.out.println("SomeThing   goes   wrong ");
			}
			PreparedStatement st = conn.prepareStatement("select * from TestTable");
			ResultSet rs = st.executeQuery();
			while(rs.next()){
				System.out.println(rs.getString("guid"));
				System.out.println(rs.getString("username"));
				System.out.println(rs.getBinaryStream("content"));
				
			}
		} catch (ClassNotFoundException e) {
			System.out.println("SomeThing     wrong ");
			System.out.println(e);
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}