如何解决微软自带JDBC的resultset缺陷

这篇文章给大家介绍如何解决微软自带JDBC的resultset缺陷，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

微软自带的3个驱动包分别为：msbase.jar，mssqlserver.jar，msutil.jar

微软JDBC resultset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)

JDBC resultset代码

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();             }         }     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   Java代码   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();             }         }

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