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. 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.. Always returns the correct number of rows having been updated. 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. 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. It gives us the number of rows that were affected by the last INSERT, DELETE or UPDATE statement. These are the top rated real world PHP examples of ibase_affected_rows extracted from open source projects. If the existing row is updated, the number of affected-rows is 2. Si se usan transacciones, es necesario llamar a mysql_affected_rows() después de una consulta INSERT, UPDATE, o DELETE, no después del COMMIT. For this reason, MySQL provides the mysql_affected_rows() function. The MySQL manual says that the update statement returns the number of affected rows. When this option is checked, the server returns the number of rows matched by the WHERE statement for UPDATE statements. Definition and Usage. Return Values. 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 Is there someone with some clues about the possible reason? The mysqli_affected_rows() function returns the number of rows affected by the previous operation, if invoked after INSERT, UPDATE, REPLACE or DELETE query. 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.) 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~ We're trying to figure out how to use that feature, and it seems that few people use it or even think about using it. The mysql function mysql_affected_rows() will return the number of rows or records affected by any update, insert or delete query. When used after select statements this function returns the number of rows. 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! 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. 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. The result object contains information about how the query affected the table. 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。 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)? The mysqli_stmt_affected_rows() function returns the number of rows affected (changed, deleted, inserted) by the recently executed statement.. This function works fine only if invoked after INSERT, UPDATE, or DELETE statements. Returns the number of affected rows on success, and -1 if the last query failed. 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。 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。 * In regard to the "number of rows affected" output status messeage/return values of a execute() API call in MySQL: Edit 1. Return Values Returns the number of affected rows on success, and -1 if the last query failed. 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. PHP ibase_affected_rows - 30 examples found. PHP mysqli: affected_rows() function Last update on February 26 2020 08:09:53 (UTC/GMT +8 hours) 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. Update: mysql_affected_rows() returns ... Stack Exchange Network Stack Exchange network consists of 176 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Same UPDATE instruction works fine when executed manually multiple times in MySQL command-line, etc. If you specify the CLIENT_FOUND_ROWS flag to mysql_real_connect() when connecting to mysqld, the affected-rows value is the number of rows “found”; that is, matched by the WHERE clause. 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. About the mysql PHP extensions, in local I've installed mysql, mysqli and mysqlnd: on the other machine I've got mysql and mysqli. We can test the success of any updating like change of password by a user and accordingly display success or failure message. In this example, the REPLACE() function replaces @classicmodelcars.com in the email column with @mysqltutorial.org.. 4) Using MySQL UPDATE to update rows returned by a SELECT statement example. mysql connector for java api (详细描述返回matched rows, 直接原因在这里.) var rows = GetDati(id).Tables[0].Rows; var result = rows.count > 0 ? It doesn't execute queries the same way a PHP or JSP script would. 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. 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. You can rate examples to help us improve the quality of examples. The ROW_COUNT function is the mysql_affected_rows equivalent in MySQL.. Keep in mind that the query browser is just a development tool. If this ag is set then MySQL returns 'found rows' instead." For UPDATE statements, the affected-rows value by default is the number of rows actually changed. Si el identificador de enlace no ha sido especificado, se asume por defecto el último enlace. "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. Nota : Sentencias SELECT Para conocer el número de filas devueltas por un SELECT, es posible usar mysql_num_rows() . 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: Thank you. 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. MySQL version is 3.23.49. 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 way we've been doing it in the past has been performing the update … If the existing row is updated using its current values, the number of affected-rows is 0. 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, affected rows is by default the number of rows that were actually changed. They wouldn't need the procedure to use the ROW_COUNT function. I tried to run the query also with the update method, but the result is always 0 rows affected. For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. 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