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jdbcÁ¬½Ósql server

import java.sql.*;
public class JdbcUtil
{
    public static void close(Statement st, Connection con)
    {
        try
        {
            st.close();
        }catch(Exception e)
        {
        }
       
        try
        {
            con.close();
        }catch(Exception e)
        {
        }
    }
   
    public static void close(ResultSet rs, Statement st, Connection con)
    {
        try
        {
            rs.close();
        }catch(Exception e)
        {
        }
        close(st, con);
    }
   
    public static Connection getConnection() throws Exception
    {
        Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
        return DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db", "sa", "54321");
    }
}


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select distinct(employeeid) from orders
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select orders.EmployeeID,Employees.EmployeeID
from orders  INNER JOIN Employees
on Employees.EmployeeID=orders.EmployeeID
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SqlCommand com = new SqlCommand("select * from myuser where username=@UserName and password=@Pwd", con);
           
            com.Parameters.Add(new SqlParameter("@UserN ......

ORACLE SQLÐÔÄÜÓÅ»¯(ÄÚ²¿Åàѵ×ÊÁÏ)

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a. RULE (»ùÓÚ¹æÔò) b. COST (»ùÓڳɱ¾) c. CHOOSE (Ñ¡ÔñÐÔ)
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MS SQL µÝ¹éº¯Êý

 declare @ID varchar(10)
set @ID=9 --¸ù½Úµã
declare @i int --¼¶Êý
declare @t table(ID varchar(10),ParentID varchar(10),Level int)
set @i = 1
insert into @t select @ID,0,0 --µ±Ç°¼¶£¬±¾¼¶£¬Èç¹û²»ÒªµÄ»°¿ÉÒÔ×¢Ê͵ô»òÔÙ¼Ó¸ö²ÎÊýÀ´Ñ¡Ôñ²Ù×÷
insert into @t select ID,ParentID,@i from t_ ......
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