>浅谈如何解决微软自带JDBC的resultset缺陷 </h1>|昆明网络公司|云南网络公司|昆明网站建设公司|昆明网页设计|云南网站制作|新媒体运营公司|APP开发|小程序研发|尽在昆明奥远科技有限公司

>浅谈如何解决微软自带JDBC的resultset缺陷

发布者：中国IT实验室信息来源：中国IT实验室发布时间：2012-01-28 浏览次数：5694

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　　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();
}
}