java中連接數據庫操作的語句，獲得執行sql語句對數據庫進行操作

由於在myeclipse中連接數據庫操作需要相應的數據庫驅動包jar文件，所以在寫代碼前導入數據庫驅動文件.jar文件還是很重要的，我選擇的是微軟的sql server數據庫，所以要事先把jar文件導入到文件中。

下面是我的代碼：

package sqlserver;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;


public class mysql {

public static  Connection getConn()
{
String user = "sa";
String password = "123456";
String dbname  = "iERP81";
String url = "jdbc:sqlserver://localhost:1433;databasename = "+dbname;
String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
Connection conn = null;
try
{
Class.forName(driverName);
conn = DriverManager.getConnection(url,user,password);



}catch(Exception e)
{
System.out.println("連接失敗");


}
return conn;
}

public static void main(String[] args) {

int count = 0;
try {
Statement statement = getConn().createStatement();

String sql = "select * from empleaveapproval ";
ResultSet rs = statement.executeQuery(sql);
while(rs.next())
{
System.out.println(rs.getNString(1));
count++;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
System.out.println("操作失敗:!");
e.printStackTrace();
}
System.out.println("總共有"+count+"個數");


}


}