第二阶段:commit 阶段,这个阶段又分成两个步骤。第一步写binlog(先调用write()将binlog内存日志数据写入文件系统缓存,再调用fsync()将binlog文件系统缓存日志数据永久写入磁盘);第二步完成事务的提交(commit),此时在redo log中记录此事务的提交日志(增加commit 标签)。 可以看出,此过程中是先写redo log再写binlog...
在上面的示例中,我们创建了一个 MySQLi 连接,并使用begin_transaction()开始事务。在进行两个 SQL 插入操作后,我们通过commit()提交事务。如果在执行 SQL 查询时出现错误,捕获异常后调用rollback()将所有操作回滚。 事务操作的流程 在理解了基本用法后,我们可以通过甘特图来展示事务操作的弹性和顺序: 2023-10-012023...
("INSERT INTO users (name, email) VALUES ('John Doe', 'john@example.com')"); $pdo->exec("UPDATE accounts SET balance = balance - 100 WHERE user_id = 1"); // 提交事务 $pdo->commit(); } catch (PDOException $e) { // 回滚事务 $pdo->rollBack(); echo "Error: " . $e->...
version 9.1 5.4.57 mysql_query() intmysql_query(MYSQL*mysql,constchar*stmt_str) Description Executes the SQL statement pointed to by the null-terminated stringstmt_str. Normally, the string must consist of a single SQL statement without a terminating semicolon (;) or\g. If multiple-statement...
5.4.53 mysql_query() intmysql_query(MYSQL*mysql,constchar*stmt_str) Description Executes the SQL statement pointed to by the null-terminated stringstmt_str. Normally, the string must consist of a single SQL statement without a terminating semicolon (;) or\g. If multiple-statement execution ...
ER_ERROR_DURING_COMMIT 1180 ER_ERROR_DURING_ROLLBACK 1181 ER_ERROR_DURING_FLUSH_LOGS 1182 ER_ERROR_DURING_CHECKPOINT 1183 ER_NEW_ABORTING_CONNECTION 1184 ER_DUMP_NOT_IMPLEMENTED 1185 ER_FLUSH_MASTER_BINLOG_CLOSED 1186 ER_INDEX_REBUILD 1187 ...
本来准备写pymysqlbinlog的接口了, 发现还没解析XID和QUERY_EVENT... 先补上吧. XID EVENT xid event比较简单, 就event_header + XID 就没了... xid是啥呢? 就当作是标识事务的就行, 重启之后会重置. 对象 大小 描述 XID 8 xid QUERY EVENT query event是记录DDL语句的. 虽然我们无法回滚DDL语句, 但还...
commit; how do i trace which query has consumed time or other way, why commit is taking 2 seconds of time. Also, FYI, the queries in the transcation set before the commit operation are not visible in slow query log. Need your expert advice please. ...
mysql_query()仅对SELECT | SHOW | EXPLAIN | DESCRIBE语句返回一个资源标识符,如果查询执行不正确则返回 FALSE。 对于其它类型的 SQL 语句如insert|update,mysql_query() 在执行成功时只返回 TRUE,出错时返回 FALSE。 非FALSE 的返回值意味着查询是合法的并能够被服务器执行。这并不说明任何有关影响到的或返回...
if($orders && $orderparts) { mysqli_query($con,"COMMIT"); } else { mysqli_query($con,"ROLLBACK"); } 222) In sproc, I can use a transaction block. I simply upload from Java all the relevant data and stuff them into the param list. ...