说说MySQL affected-rows 问题初见~ 当每次我们在在mysql中执行了DML(本文主要关注insert, update, delete, replace)命令后,取得的响应中常常看到有些像affected-rows的东西~ mysql_affected_rows() devuelve el número de filas afectadas en la ultima sentencia INSERT, UPDATE o DELETE sobre el servidor asociado con el identificador_de_enlace especificado. If the CLIENT_FOUND_ROWS flag to mysql_real_connect() is specified when connecting to mysqld, affected rows is instead the number of rows matched by the WHERE clause. I tried to run the query also with the update method, but the result is always 0 rows affected. The mysql function mysql_affected_rows() will return the number of rows or records affected by any update, insert or delete query. * In regard to the "number of rows affected" output status messeage/return values of a execute() API call in MySQL: Nota : Sentencias SELECT Para conocer el número de filas devueltas por un SELECT, es posible usar mysql_num_rows() . If the existing row is updated, the number of affected-rows is 2. When used after select statements this function returns the number of rows. For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. A call might look like this: SELECT changes() FROM tab If you have performed an INSERT, DELETE or UPDATE on the table "tab" before calling this command, the expression gives us the number of rows affected. Back again, > *should* probably be changed when you do the update in this case there is no difference between "updated" and "matched" rows *anyway*: since 1 column (timestamp) forced to update always, "matched rows" and "updated rows" counts will be always the same, and whole subject our discussion will not have a ground. Si el identificador de enlace no ha sido especificado, se asume por defecto el último enlace. If you need to know the number of rows affected by the SELECT query you need to use the mysqli_stmt_num_rows() function. The result object returned from the example above looks like this: { fieldCount: 0, affectedRows: 1, insertId: 0, serverStatus: 34, warningCount: 0, ... Return the number of affected rows: The MySQL manual says that the update statement returns the number of affected rows. The ROW_COUNT function is the mysql_affected_rows equivalent in MySQL.. Keep in mind that the query browser is just a development tool. When this option is checked, the server returns the number of rows matched by the WHERE statement for UPDATE statements. The title should of read: "What should the behaviour of update statment be in terms of number of affected rows in the context of repeated updates, or updates that would not change the record" *phew! Return Values Returns the number of affected rows on success, and -1 if the last query failed. If this ag is set then MySQL returns 'found rows' instead." mysql connector for java api (详细描述返回matched rows, 直接原因在这里.) 当使用 UPDATE 查询,MySQL 不会将原值与新值一样的列更新。这样使得 mysql_affected_rows() 函数返回值不一定就是查询条件所符合的记录数,只有真正被修改的记录数才会被返回。 REPLACE 语句首先删除具有相同主键的记录,然后插入一个新记录。 Returns the number of affected rows on success, and -1 if the last query failed. Then in the section on C API for mySQL i found in the option section: return-found-rows, tell mysql_info() to return found rows instead of updated rows when using UPDATE. For REPLACE, deleted rows are also counted. java api(dml return rows, ddl return 0, 规范没有详细说明执行返回的rows到底是matched rows还是affected rows, 所以各数据库厂商提供的驱动可以自由返回, 有可能mysql返回matched rows而oracle返回affected rows.) var rows = GetDati(id).Tables[0].Rows; var result = rows.count > 0 ? "Return number of found rows, not number of affected rows: By default, MySQL returns the number of rows changed by the last UPDATE, deleted by the last DELETE or inserted by the last INSERT statement. 참고로 MySQL에서 Affected Rows는 “정말로 데이터가 ... Query OK, 1 row affected (0.00 sec) mysql> update test set j = 1; Query OK, 0 rows affected (0.01 sec) Rows matched: 1 Changed: 0 Warnings: 0 mysql> update test set j = 2; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 It gives us the number of rows that were affected by the last INSERT, DELETE or UPDATE statement. Due to the fact that an UPDATE statement could affect many rows, or indeed, none at all, it is helpful to receive feedback on how many rows were affected. You can supply the values for the SET clause from a SELECT statement that queries data from other tables.. For example, in the customers table, some customers do not have any sale representative. It doesn't execute queries the same way a PHP or JSP script would. Bug #92813: insert ..on duplicate key update return 0 rows affected: Submitted: 17 Oct 2018 4:54: Modified: 17 Oct 2018 9:46: Reporter: beebol ding: Email Updates: PHP mysqli_affected_rows() 函数 PHP MySQLi 参考手册 [mycode type='php' desc='从不同的查询中输出所影响记录行数:'] [/mycode] 定义和用法 mysqli_affected_rows() 函数返回前一次 MySQL 操作(SELECT、INSERT、UPDATE、REPLACE、DELETE)所影响的记录行数。 语.. When performing an update query (the following is just an example; any update query could be used) such as:. These are the top rated real world PHP examples of ibase_affected_rows extracted from open source projects. When a trigger exists on a table being inserted or updated, the return value includes the number of rows affected by both the insert or update operation and the number of rows affected by the trigger or triggers. MySQL returns the number of affected-rows based on the action it performs: If the new row is inserted, the number of affected-rows is 1. Si se usan transacciones, es necesario llamar a mysql_affected_rows() después de una consulta INSERT, UPDATE, o DELETE, no después del COMMIT. About the mysql PHP extensions, in local I've installed mysql, mysqli and mysqlnd: on the other machine I've got mysql and mysqli. For this reason, MySQL provides the mysql_affected_rows() function. 在操作mysql语句时,有时需要通过affected_rows来判断语句执行的情况。 例如在事务操作中,就可以通过affected_rows来判断事务是否执行成功,以进一步执行事务的提交或者回滚操作。 Edit 1. I tried converting the expression to a select, such as Return Values. The result object contains information about how the query affected the table. Is there someone with some clues about the possible reason? Always returns the correct number of rows having been updated. For UPDATE, affected rows is by default the number of rows that were actually changed. update t1 inner join t2 on t1.id=t2.id set t1.name="foo" where t2.name="bar"; Query OK, 324 rows affected (1.82 sec) how do you see which rows have been affected (the 324 rows affected in the response)? However, sometimes the mysql_affected_rows() returns 0 instead of 1; so my code continues to INSERT a new row and I end up with a duplicate. The mysqli_affected_rows() function returns the number of rows affected by the previous operation, if invoked after INSERT, UPDATE, REPLACE or DELETE query. mysql_affected_rows介绍 php mysql_affected_rows函数用于获取执行某一SQL语句(如INSERT,UPDATE 或 DELETE )所影响的行数,本文章向大家介绍php mysql_affected_rows函数的使用方法和基本使用实例,需要的朋友可以参考一下。 mysql_affected_rows() may be called immediately after executing a statement with mysql_query() or mysql_real_query().It returns the number of rows changed, deleted, or inserted by the last statement if it was an UPDATE, DELETE, or INSERT.For SELECT statements, mysql_affected_rows() works like mysql_num_rows(). For UPDATE statements, the affected-rows value by default is the number of rows actually changed. If the last query was a DELETE query with no WHERE clause, all of the records will have been deleted from the table but this function will return zero with MySQL versions prior to 4.1.2. Update: mysql_affected_rows() returns ... 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