mysql affected rows

How can I use the SQL aggregate function to obtain the number of affected rows for addition, deletion, and modification? It is usually very useful to calculate the number of rows returned or affected by a query before performing further operations.

Essence: Read operation, with mysql_num_rows function, write operation with mysql_affected_rows functionmysql_num_rows () returns the number of rows in the result set. This command is valid only for SELECT statements. To get the number of rows

In normal mode, $ pdo-& amp; gt; exec ($ SQL); can be used to return the number of affected rows. How can I know the number of affected rows if data is inserted to the pre-processed object? $ Stmt $ pdo-& amp; gt; prepare ($ SQL); $ stmt-& amp; gt;

MySQL Stored procedure: Provides query statements and returns the number of rows affected by query executionDELIMITER $$DROP PROCEDURE IF EXISTS' P_get_select_row_number ' $$CREATE PROCEDURE' test_cases '. ' P_get_select_row_number '

Database Common backup scheme 1. Full-scale backupRefers to a full copy of all data or applications at a given point in timeAdvantages: Fast Data recoveryCons: Long backup times 2. Incremental backupmeans that after a full backup or a

Normal mode, with $pdo->exec ($SQL); Can return the number of affected rows; How do I know how to affect the number of rows if I insert delete data into a preprocessed object?$stmt = $pdo->prepare ($SQL);$stmt->execute (); Reply content:

Objective In order to ensure consistent integrity of data, there is a locking mechanism in any database. The quality of locking mechanism should be directly thought of the concurrent processing ability and performance of a database system, so the

Mysql_affected_rows(PHP 3, PHP 4) Mysql_affected_rows -- gets the number of records affected by the previous MySQL operationDescriptionInt mysql_affected_rows ([Resource link_identifier]) Mysql_affected_rows () returns the number of rows affected by

How to configure MySQL database server on CentOS BitsCN.com accidentally found CentOS Professional Forum, remember: http://www.centospub.com As a result, the initial learning configuration This environment: CentOS system, Mysql-server (version

The database has an order table with a row of data order_id1555 (auto-incrementing primary key) and a tag field order_mark2 to execute the statement. use the mysql client tool QueryOK, 0 rowsaffected (0.00sec) Rowsmatched: 1 Changed: 0 Warnings: 0