我已经编写了sql server连接部分。当我运行此代码时,我收到了此错误。
Error Trace in getConnection() : com.microsoft.jdbc.sqlserver.SQLServerDriver
Error: No active Connection
java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.sample.DB.getConnection(DB.java:30)
at com.sample.DB.displayDbProperties(DB.java:49)
at com.sample.DB.main(DB.java:85)
我已经安装了sql sever 2008 R2。我serached谷歌我找不到解决方案....
这是我的代码
public class DB {
private java.sql.Connection con = null;
private final String url = "jdbc:microsoft:sqlserver://";
private final String serverName= "localhost";
private final String portNumber = "1433";
private final String databaseName= "XONTHOMass_User";
private final String userName = "sa";
private final String password = "xont@123";
// Informs the driver to use server a side-cursor,
// which permits more than one active statement
// on a connection.
private final String selectMethod = "cursor";
private String getConnectionUrl(){
return url+serverName+":"+portNumber+";databaseName="+databaseName+";selectMethod="+selectMethod+";";
}
private java.sql.Connection getConnection(){
try{
System.out.println("========1========");
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
System.out.println("==== 2=====");
con = java.sql.DriverManager.getConnection(getConnectionUrl(),userName,password);
if(con!=null) System.out.println("Connection Successful!");
}catch(Exception e){
e.printStackTrace();
System.out.println("Error Trace in getConnection() : " + e.getMessage());
}
return con;
}
/*
Display the driver properties, database details
*/
public void displayDbProperties(){
java.sql.DatabaseMetaData dm = null;
java.sql.ResultSet rs = null;
try{
con= this.getConnection();
if(con!=null){
dm = con.getMetaData();
System.out.println("Driver Information");
System.out.println("\tDriver Name: "+ dm.getDriverName());
System.out.println("\tDriver Version: "+ dm.getDriverVersion ());
System.out.println("\nDatabase Information ");
System.out.println("\tDatabase Name: "+ dm.getDatabaseProductName());
System.out.println("\tDatabase Version: "+ dm.getDatabaseProductVersion());
System.out.println("Avalilable Catalogs ");
rs = dm.getCatalogs();
while(rs.next()){
System.out.println("\tcatalog: "+ rs.getString(1));
}
rs.close();
rs = null;
closeConnection();
}else System.out.println("Error: No active Connection");
}catch(Exception e){
e.printStackTrace();
}
dm=null;
}
private void closeConnection(){
try{
if(con!=null)
con.close();
con=null;
}catch(Exception e){
e.printStackTrace();
}
}
public static void main(String[] args) throws Exception
{
DB myDbTest = new DB();
myDbTest.displayDbProperties();
}
}
请帮助我..我使用eclipse做了这个应用程序。我把jar文件也放在`sqljdbc4.jar'...
请帮帮我
答案 0 :(得分:1)
您收到例外:
java.lang.ClassNotFoundException:com.microsoft.jdbc.sqlserver.SQLServerDriver
这意味着您的程序无法找到驱动程序,因此甚至无法连接到数据库。
Mircosoft有一篇关于How to Get Started with Microsoft JDBC的文章:
必须在CLASSPATH变量中列出JDBC .jar文件的Microsoft SQL Server 2000驱动程序。 CLASSPATH变量是Java虚拟机(JVM)用于在计算机上查找JDBC驱动程序的搜索字符串。
答案 1 :(得分:0)
完整的猜测是,您已经安装了Express Edition(您应该始终提及版本,而不仅仅是版本),但您尚未使用SQL Server配置管理器启用TCP / IP支持。默认情况下,Express Edition没有启用任何网络协议,因此除非您先启用它,否则无法通过TCP / IP进行连接。
答案 2 :(得分:0)
我认为这是您需要使用的驱动程序
com.microsoft.sqlserver.jdbc.SQLServerDriver
不是com.microsoft.jdbc.sqlserver.SQLServerDriver
答案 3 :(得分:0)
只需做一件事就转到http://www.java2s.com/Code/Jar/s/Downloadsqljdbcjar.htm并下载sqljdbc jar并在你的程序中使用它。