affected rows

Original post address: Http://community.csdn.net/Expert/topic/3220/3220744.xml? Temp =. 6029474. Problem description: Select 'Q', 100, 0000001, 0000100, '2017-'in the insert primary table '?Union all select 'M', 200, 0000001, 0000200' Insert

Create proc p_test @ Name varchar (20 ), @ Rowcount int output As Begin Select * From t_customer where name = @ name Set @ rowcount = @ rowcount End Go Bytes ---------------------------------------------------------------------------------------- --

Executereader executes the command to return the line. To improve performance, executereader uses the Stored Procedure Call Command of the transact-SQL sp_executesql system. Therefore, executereader may fail to achieve the expected results if it is

Databases are the most common in our development projects. databases are used for complex projects and simple projects as long as data operations (add, delete, modify, query) are involved. Of course, the types of databases used vary with project

Ec (2); [PDO configuration] 1. Make sure that the PHP version is 5.2.5 or above (mainly for 5.2.5 I used. For the first time I did not know 5.1.x, the result has been poor ~ _~) 2. in php. find the DynamicExtensions Extension Section in ini, remove

ThinkPHP learning-CURD operations (I) written in front Learn ThinkPHP this week and record the learning diary. We should not only learn how to use TP, but also learn the TP framework from the source code. The diary is written every day, but not

For a simple PHP problem, I want to obtain the number of affected rows in the database & nbsp; but how does $ row obtain the number of rows affected by the returned results in the implementation class? this is not a problem for beginners, this bend

Merge column values Original: zhujian Adapted from: AI xinjue Luo. Lu Hua (flowers bloom in ice and snow forests in the past 18 years)-12-16 Guangdong and Shenzhen Table structure. The data is as follows:Id value-----------1 aa1 bb2 aaa2 bbb2

SQL Server uses logs to restore the database A full backup + the latest log backup is required.   * -- Description:Report data changes in the primary database to the standby database in a timely manner.The data of the standby database can be used

This blog briefly introduces several types of queries commonly used in SQL Server and their usage methods. 1. Obtain a single value using the ExecuteScalar Method The ExecuteScalar method is one of the SqlCommand class methods. It executes the query

Add, delete, modify, and query objects and Methods Recently, I have been working with my friends on data centers. I am responsible for layer D. When I re-write sqlhelper, I found that the query operation uses the SqlDataAdapter object. I remember

Executescalar () returns the value of the first column of the first row, which is generally used to execute such queries. Select count (*) from table The returned type is object. If the database does not have any records, how can we determine?

identity) column, which is also called an auto-increment column. in SQL Server 2000, the identity column is defined by identity, the following is an example of a function related to getting the id value of the last inserted record SQL Server, you

Ke leyi adopts the C #. Net Language for compiling and has powerful functions. You can use the SQL Server Connector class to efficiently and conveniently access the SQL database. Ke leyi contains three parts: execution of simple SQL statements,

Using system; Using system. Data; Using system. Data. sqlclient; Using system. configuration; Using system. Web; Using system. Web. Security; Using system. Web. UI; Using system. Web. UI. webcontrols; Using system. Web. UI. webcontrols.

Table A records the following: Aid anum1 a200501112 a200501123 a200501134 a200501145 a20050115 Table B records the following:Bid bname1 20060324012 20060324023 20060324034 20060324048 2006032408The experiment is as follows:1. Left joinThe SQL

Select count (*) requires a full table scan to return the number of rows in the table. This is a very time-consuming operation for a table with a large data size. To obtain the number of all rows in a table, consider the alternative solution

SQL replace into usage Replace runs like insert. There is only one exception. Assume that an old record in the table and a record used for primary If the new record of a key or unique index has the same value, the old record is deleted before the

------ Convert decimal to eighteen bytes Create Function f_int18 (@ num INT) Returns nvarchar (50) As Begin If @ num = 0 Return '0' Declare @ s nvarchar (50) Set @ s ='' While @ num> 0 Select @ s = substring ('0123456789abcdefhg ', @ num % 18 + 1, 1)

Table A records the following: Aid anum 1 a20050111 2 a20050112 3 a20050113 4 a20050114 5 a20050115 Table B records the following:Bid bname1 20060324012 20060324023 20060324034 20060324048 2006032408The experiment is as follows:1. Left joinThe SQL