2、我们这次不通过odbc桥来操作数据库,我们采用SQL Server driver 来实现对SQLServer数据库的操作,这将是我们这篇文章的重点,因为JDBC-odbc桥是一种常见的操作windows系统数据库的常用方法,但它存在的缺点很多,所以现在很多开发者都侧重于使用SQLServer driver来操作,在这里我们通过一步步的调试,来加深读者对这种连接的理解。
在通常的理解下,只要我们装了SQLServer driver for JDBC我们便可进行数据库编程,事实则不然,首先我们看下边的代码:
/***********************************************
/*
/*DbTest.Java
/*
/******************************************* */
import Java.SQL.*;
public class DbTest {
Connection con;
Statement sta;
ResultSet rs;
String driver;
String url;
String user;
String pwd;
public DbTest()
{
driver = "com.microsoft.JDBC.SQLServer.
SQLServerDriver";;
url = "JDBC:microsoft:SQLServer:
//localhost:1433;DatabaseName
=StoreManager";
user = "sa";
pwd = "potsmart10";
init();
}
public void init()
{
try{
Class.forName(driver);
System.out.println("driver is ok");
con = DriverManager.getConnection
(url,user,pwd);
System.out.println("conection is ok");
sta = con.createStatement();
rs = sta.executeQuery
("select * from room");
while(rs.next())
System.out.println
(rs.getInt("roomNum"));
}catch(Exception e)
{
e.printStackTrace();
}
}
public static void main
(String args [])
//自己替换[]
{
new DbTest();
}
}
这段代码跟上变得代码是一样的,差别在于驱动,还有url,这是在使用SQLServer driver for JDBC 中遇到的困惑
按道理讲,上边这段代码应该没错,可首先我们来看一下,如果SQLser服务器没有升级到sp3(在使用JDBC时,如果系统是xp或者2003务必要把SQLServer 升级到sp3),我们看看运行结果:
driver is ok
Java.SQL.SQLException:
[Microsoft][SQLServer 2000 Driver
for JDBC]Error establis
hing socket.
at com.microsoft.JDBC.base.
BaseExceptions.createException
(Unknown Source
)
at com.microsoft.JDBC.base.
BaseExceptions.getException
(Unknown Source)
at com.microsoft.JDBC.base.
BaseExceptions.getException
(Unknown Source)
at com.microsoft.JDBC.SQLServer.
tds.TDSConnection.
(Unknown Source)
at com.microsoft.JDBC.SQLServer.
SQLServerImplConnection.open
(Unknown Sou
rce)
at com.microsoft.JDBC.base.BaseConnection.
getNewImplConnection(Unknown S
ource)
at com.microsoft.JDBC.base.
BaseConnection.open(Unknown Source)
at com.microsoft.JDBC.base.
BaseDriver.connect(Unknown Source)
at Java.SQL.DriverManager.
getConnection(DriverManager.Java:523)
at Java.SQL.DriverManager.
getConnection(DriverManager.Java:171)
at DbTest.init(DbTest.Java:32)
at DbTest.(DbTest.Java:25)
at DbTest.main(DbTest.Java:46)
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