affected rows

//. H /////////////////////////////////////// ///////////////////////////////////////// // Cppmysql-a c ++ wrapper around the MySQL database library. // // Copyright (c) 2009 Rob Groves. All Rights Reserved. lizp.net@gmail.com // // Permission to

create table tb(id varchar(3) , pid varchar(3) , name varchar(10))insert into tb values('001' , null, 'Guangdong province')insert into tb values('002' , '001' , 'Guangzhou')insert into tb values('003' , '001' , 'Shenzhen City')insert into tb values('

MySQL Vertical Split (Reading Notes)1. Vertical Split Compared with horizontal split, vertical split is easier to implement. Vertical Split means to split different business data in the database into different databases. Vertical splitting can

Connection implementation method and precautions of the Python database. To connect to a database in Python, first install several important things: (1) Python-dev package(2)setuptools-0.6c11.tar.gz(3366mysql-python-1.2.3.tar.gz The following

The first version is rough   Http://blog.csdn.net/happyflystone/archive/2008/07/23/2700649.aspx   This record is detailed and forms are stored in the database.   Friends who need it can download and use it from my resources.

I. database knowledge 1, left join, right joinFor example, the record of Table A is as follows: Id num1 a200501112 a200501123 a200501134 a200501145 a20050115 table B records are as follows: ID name1 20060324012 20060324023 20060324034 20060324048 200

The database structure is as follows:Category TableCategory id upper-level Category id classification name classification level sorting value The code is as follows:Copy code Id parentid categoryname categorylevel ordering1 null c1 1 1 12 1 c11 2

I really do not understand it, see this: http://www.cnblogs.com/jixuege-1/p/6272888.htmlThere are two main ways to use MySQL for Python operations: Native Module Pymsql ORM Framework Sqlachemy PymysqlPymsql is a module that

Source: mysqlpub.com MySQL has two functions to calculate the number of rows affected by the previous statement. Unlike SqlServer/Oracle, do not cause functional problems due to this difference: 1. Use the found_rows () function to determine the

Replace syntaxReplace [low_priority | delayed] [into] tbl_name [(col_name,...)] values ({expr | default },...), (...),... or: Replace [low_priority | delayed] [into] tbl_name set col_name = {expr | default},... or: Replace [low_priority | delayed]

Understanding the cursor (2) Introduction to the attribute of the cursor and Case Study of Different cursor categories links: Understanding the cursor (1): Overview of the cursor http://www.bkjia.com/database/201212/177395.html PL/SQL provides six

In MySQL, Replace INTO plays a very powerful role. Many friends are useless, but its function is better than update insert. The reason is not as follows. The author of a plug-in day DST asked me about the difference between Replace INTO and insert

1. ExecuteNonQuery and ExecuteScalar do not need to return the result set for data update. We recommend that you use ExecuteNonQuery. Because no result set is returned, network data transmission can be saved. It returns only the number of affected

Several Methods for automatic implementation of CLP updates to stop db2 from automatically submitting settings from clp: 1. Go to command line settings: C: \ Users \ Administrator> db2 (c) copyright IBM Corporation 1993,200 7DB2 client 10.1.0's

The REPEATABLE-READ can be read again, and the content of the select table in the setautocommit0 or STARTTRANSACTION state will not change. This isolation level may cause the read to have been modified. For example, in session 1, read a field and a

Why does the sqlcommand. executenonquery () method return-1? I don't know if you have encountered the case of returning-1 when using the executenonquery method. The number of affected rows returned by the executenonquery method during addition,

  Method 1. Official example As we all know, it is also a method that many opponents of the LINQ to SQL think is inefficient. NorthwinddatacontextDB =NewNorthwinddatacontext();VaRCustomers = dB. Customers. Where (C => C. customerid. startswith

------------------------------------ -- Author: flystone -- Version: v1.001 -- Date: 2008-08-01 12:39:33 ------------------------------------ -- Test data: Ta If object_id ('ta ') is not null Drop table Ta Go Create Table TA (BNO int,

Use of MySQLi function library in PHP and character encoding configuration of Forms 1. what is mysqli? The PHP-MySQL function library is the most primitive extension library for PHP to operate MySQL databases. The I of PHP-MySQLi represents

-------------------------------------- Author: Flystone-- Version: V1.001-- Date: 2008-08-01 12:39:33------------------------------------ -- Test Data: taIf object_id ('ta ') is not nullDrop table taGoCreate table ta (bno int, bname nvarchar (5),