mysql

Error running mysql_install_db: could not find ./bin/my_print_defaults

由 我的梦境 提交于 2021-02-10 03:03:24
问题 I seem to be having an issue getting MySQL 5.6.1.5 to install from Source. I am running RHEL 6. I was able to perform the cmake , make , and make install without issues. I am attempting to run the mysql_install_db binary and when I do I get the following error: Fatal ERROR: Could not find ./bin/my_print_defaults If you compiled from source, you need to run 'make install' to copy the software into the correct location ready for operation. If you are using a binary release, you must either bat

Array in the parameter when creating PDO query

由 与世无争的帅哥 提交于 2021-02-09 20:34:22
问题 Can I use a few lines in the parameter Example SELECT id, city_id FROM an_objects WHERE city_id IN (:arrCity) (:arrCity) (1,2,3,4,5,6) But now I have done like this SELECT id, city_id FROM an_objects WHERE city_id IN (:1p, :2p, :3p, ...... :100p) And it's very bad 回答1: <?php private function PDOBindArray(&$poStatement, &$paArray){ foreach ($paArray as $k=>$v) { @$poStatement->bindValue($k, $v[0], $v[1]); } } // the array structure should now look something like this $inputArray = array( '

Array in the parameter when creating PDO query

由 爱⌒轻易说出口 提交于 2021-02-09 20:33:30
问题 Can I use a few lines in the parameter Example SELECT id, city_id FROM an_objects WHERE city_id IN (:arrCity) (:arrCity) (1,2,3,4,5,6) But now I have done like this SELECT id, city_id FROM an_objects WHERE city_id IN (:1p, :2p, :3p, ...... :100p) And it's very bad 回答1: <?php private function PDOBindArray(&$poStatement, &$paArray){ foreach ($paArray as $k=>$v) { @$poStatement->bindValue($k, $v[0], $v[1]); } } // the array structure should now look something like this $inputArray = array( '

Array in the parameter when creating PDO query

由 99封情书 提交于 2021-02-09 20:32:58
问题 Can I use a few lines in the parameter Example SELECT id, city_id FROM an_objects WHERE city_id IN (:arrCity) (:arrCity) (1,2,3,4,5,6) But now I have done like this SELECT id, city_id FROM an_objects WHERE city_id IN (:1p, :2p, :3p, ...... :100p) And it's very bad 回答1: <?php private function PDOBindArray(&$poStatement, &$paArray){ foreach ($paArray as $k=>$v) { @$poStatement->bindValue($k, $v[0], $v[1]); } } // the array structure should now look something like this $inputArray = array( '

Array in the parameter when creating PDO query

由 泄露秘密 提交于 2021-02-09 20:31:51
问题 Can I use a few lines in the parameter Example SELECT id, city_id FROM an_objects WHERE city_id IN (:arrCity) (:arrCity) (1,2,3,4,5,6) But now I have done like this SELECT id, city_id FROM an_objects WHERE city_id IN (:1p, :2p, :3p, ...... :100p) And it's very bad 回答1: <?php private function PDOBindArray(&$poStatement, &$paArray){ foreach ($paArray as $k=>$v) { @$poStatement->bindValue($k, $v[0], $v[1]); } } // the array structure should now look something like this $inputArray = array( '

Array in the parameter when creating PDO query

由 与世无争的帅哥 提交于 2021-02-09 20:30:57
问题 Can I use a few lines in the parameter Example SELECT id, city_id FROM an_objects WHERE city_id IN (:arrCity) (:arrCity) (1,2,3,4,5,6) But now I have done like this SELECT id, city_id FROM an_objects WHERE city_id IN (:1p, :2p, :3p, ...... :100p) And it's very bad 回答1: <?php private function PDOBindArray(&$poStatement, &$paArray){ foreach ($paArray as $k=>$v) { @$poStatement->bindValue($k, $v[0], $v[1]); } } // the array structure should now look something like this $inputArray = array( '

【Database】MySQL实战45讲

由 。_饼干妹妹 提交于 2021-02-09 20:29:57
01 | 基础架构：一条SQL查询语句是如何执行的？ 1. MySQL 的基本架构图： MySQL可以分成： Server层 和 存储引擎层 两部分。 Server层：包含连接器、查询缓存、分析器、优化器、执行器等等，涵盖 MySQL 的大多数核心服务功能，以及所有的内置函数（日期，时间，数学和加密函数等），所有跨存储引擎的功能都在这一层实现，比如存储过程，触发器，视图等。 存储引擎层：负责数据的存储和提取，架构模式是插件式的，支持 InnoDB（默认的存储引擎） , MyISAM, Memory 等多个存储引擎。 【1】连接器 连接器负责和客户端建立连接，获取权限，维持和管理连接。 mysql -h$ip -P$port -u$user -p 连接器要和服务端建立连接。 （1）TCP握手 （2）认证user身份 （3）去权限表里面查询user拥有的权限。（此后这个连接里面的权限判断逻辑，都将依赖于此时读到的权限） 这就意味着，一个用户建立成功连接之后，即使你用管理员账号对这个用户的权限做了修改，也不会影响到已经存在连接的权限。 修改完成之后，只有再新建的连接才会使用新的权限设置。 MySQL查看现在所有的连接： mysql> show processlist; command 列的 Sleep 状态表示现在系统里面有一个空闲连接。 客户端如果太长时间没有动静

12月14日学习笔记

由 旧巷老猫 提交于 2021-02-09 20:07:53
17.1 MySQL主从介绍 17.2 准备工作 17.3 配置主 17.4 配置从 17.5 测试主从同步 MySQL主从介绍 MySQL主从又叫做Replication、AB复制。简单讲就是A和B两台机器做主从后，在A上写数据，另外一台B也会跟着写数据，两者数据实时同步的 MySQL主从是基于binlog的，主上须开启binlog才能进行主从。 主从过程大致有3个步骤 1）主将更改操作记录到binlog里 2）从将主的binlog事件(sql语句)同步到从本机上并记录在relaylog里 3）从根据relaylog里面的sql语句按顺序执行 主上有一个log dump线程，用来和从的I/O线程传递binlog 从上有两个线程，其中I/O线程用来同步主的binlog并生成relaylog，另外一个SQL线程用来把relaylog里面的sql语句落地。 准备工作（配置主） 安装mysql 修改my.cnf，增加server-id=130和log_bin=aminglinux1 修改完配置文件后，启动或者重启mysqld服务 把mysql库备份并恢复成aming库，作为测试数据 mysqldump -uroot mysql > /tmp/mysql.sql mysql -uroot -e “create database aming” mysql -uroot aming <

MYSQL nested query running very slow?

由 淺唱寂寞╮ 提交于 2021-02-09 19:04:21
问题 The following query is constantly timing out, is there a less overhead way to achieve the same function ? UPDATE Invoices SET ispaid = 0 WHERE Invoice_number IN (SELECT invoice_number FROM payment_allocation WHERE transactionID=305) What I'm doing is unallocating invoices from a transaction, there can be up to 30+ records returned but it stops the database dead everytime I try to run it 回答1: USE JOIN instead of subquery it will improve the performance. Create index on Invoice_number column in

MYSQL nested query running very slow?

由 折月煮酒 提交于 2021-02-09 19:03:38
问题 The following query is constantly timing out, is there a less overhead way to achieve the same function ? UPDATE Invoices SET ispaid = 0 WHERE Invoice_number IN (SELECT invoice_number FROM payment_allocation WHERE transactionID=305) What I'm doing is unallocating invoices from a transaction, there can be up to 30+ records returned but it stops the database dead everytime I try to run it 回答1: USE JOIN instead of subquery it will improve the performance. Create index on Invoice_number column in
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