sql源码分析

Spark SQL组件源码分析

功能 Spark新发布的Spark SQL组件让Spark对SQL...parseSql(sqlText)这一步是使用一个简单的sql parser解析了一下sql，这个scala parser是Catalyst包里提供的一个SqlParser，源码注释是这么说的：/*A very simple SQL parser.Based loosly on:*...

Solrflux源码分析-Sql Support within Solr-类Sql的solr搜索实现(2)

solrflux工作流程:(1)将用户输入的sql语法（部分语法带有solr本身query特征，例如commit、optimize），按照自定义的词法、语法、抽象语法定义规则，执行词法分析、语法分析、生成抽象语法树，主要依赖/grammar/Solrq.g ...

mybatis-plus源码分析之sql注入器

饶了一圈，发现我现在还没讲sql注入器的源码分析，你不用慌，你得体现出老司机的成熟稳定，之前我也跟你说了sql注入器的原理了，只剩下源码分析，这时候我们应该在源码分析之前做足前戏，前戏做足就剩下撕、拉、扯、剥开源码的外衣了，...

Solrflux源码分析-Sql Support within Solr-类Sql的solr搜索实现(2)

MySQL·源码分析·Subquery代码分析

其投影列中，和where条件中，各有一个子查询，这些在MySQL中都使用Item来描述，具体来说是Item_subselect背景首先对于子查询这个SQL construct，有相关和非相关两个类别，SQL planner在完成语法解析和语义检查后，就可以确定一个子查询是否...

PgSQL·源码分析·pg_dump分析

PostgreSQL本身提供了逻辑导出工具pg_dumpall和pg_dump，其中pg_dumpall导出所有的数据库，pg_dump导出单个数据库，两个工具的用法和参数不再详细介绍，本文从代码层面上对此过程进行分析。概括地说，逻辑导出要干的事情就是连接对应数据库...

MySQL·源码分析·Derived table代码分析

这是一个在where条件中IN子查询，在PG中叫做subquery，MySQL中称为subselect无论哪种类型的子查询，都有相关和非相关两种，这篇文章主要介绍非相关的derived table，是MySQL在5.6/5.7中就已经支持的SQL语法，在8.0中又添加了对于具有相关性...

MySQL·源码分析·词法分析及其性能优化

sql/sql_parse.cc:6917:Check that if MYSQLparse()failed either thd->is_error()is set,or an sql/sql_lex.cc:3442:parser before returning an error from MYSQLparse.If your MySQL 手工打造的词法分析器对应的源代码文件是 sql/sql_...

MySQL·源码分析·MySQL 半同步复制数据一致性分析

sync_relay_log的配置源码剖析 sql/rpl_slave.cc handle_slave_io 5764 if(queue_event(mi,event_buf,event_len)).5771 if(RUN_HOOK(binlog_relay_io,after_queue_event,5772(thd,mi,event_buf,event_len,synced)))after_queue_event->...

MySQL·源码分析·SHUTDOWN过程

ORACLE 中的SHUTDOWN MySQL SHUTDOWN LEVEL 暂时只有一种，源码中留了 LEVEL 的坑还没填在此借用 Oracle 的 SHUTDOWN LEVEL 分析 Oracle SHUTDOWN LEVEL 共有四种：ABORT、IMMEDIATE、NORMAL、TRANSACTIONAL ABORT 立即结束所有SQL 回滚未...

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.sql转换 .sql变量 .sql分页 .sql删除 .sql子查询 .sql基础 .sql更新 .sql字符串

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云数据库RDS SQL Server版

云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。

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