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Articles by Bindmapper ForNamespace

MyBatis 源码系列：MyBatis 解析配置文件、二级缓存、SQL

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By Bindmapper ForNamespace, Parsepending CacheRefs, parsePending Statements, sqlCommand Type
| cnblogs.com
解析全局配置文件 启动流程分析 String resource = "mybatis-config.xml"; //将XML配置文件构建为Configuration配置类 reader = Resources.getResourceAsReader(resource); // 通过加载配置文件流构建一个SqlSessionFactory DefaultSqlSessionFactory SqlSessionFactory sqlMapper = new SqlSessionFactoryBuilder().build(reader); 通过上面代码发现，创建SqlSessionFactory的代码在SqlSessionFactoryBuilder中，进去一探究竟： //整个过程就是将配置文件解析成Configration对象，然后创建SqlSessionFactory的过程 //Configuration是SqlSessionFactory的一个内部属性 public SqlSessionFactory build(Reader reader, String...
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Mybatis占位符#和$的区别？源码解读-51CTO.COM

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By configuration.addLoaded Resource, Bindmapper ForNamespace, Parsepending CacheRefs, parsePending Statements
| 51cto.com
本文针对笔者日常开发中对 Mybatis 占位符 #{} 和 ${} 使用时机结合源码，思考总结而来 • Mybatis 版本 3.5.11 • Spring boot 版本 3.0.2 • mybatis-spring 版本 3.0.1 • github地址：https://github.com/wayn111， 欢迎大家关注，点个star 一. 启动时，mybatis-spring解析xml文件流程图 Spring项目启动时，mybatis-spring自动初始化解析xml文件核心流程。 流程图 Mybatis在buildSqlSessionFactory()会遍历所有mapperLocations（xml文件）调用xmlMapperBuilder.parse()解析，源码如下： 在 parse() 方法中，Mybatis通过configurationElement(parser.evalNode("/mapper"))方法解析xml文件中的各个标签。 public class XMLMapperBuilder extends BaseBuilder { ...
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聊聊mybatis-plus的sql加载顺序_hello_ejb3的博客-CSDN博客

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By xmlMapper Builder.parse, configuration.addLoaded Resource, Bindmapper ForNamespace, Parsepending CacheRefs
| CSDN
本文主要研究一下如果mybatis mapper定义了多个同名方法会不会有问题 com/baomidou/mybatisplus/core/MybatisConfiguration.java /** * MybatisPlus 加载 SQL 顺序： * <p> 1、加载 XML中的 SQL </p> * <p> 2、加载 SqlProvider 中的 SQL </p> * <p> 3、XmlSql 与 SqlProvider不能包含相同的 SQL </p> * <p>调整后的 SQL优先级：XmlSql > sqlProvider > CurdSql </p> */ @Override public void addMappedStatement(MappedStatement ms) { if (mappedStatements.containsKey(ms.getId())) { /* * 说明已加载了xml中的节点； 忽略mapper中的 SqlProvider 数据 */ logger.error("mapper[" + ms.getId() + "] is...
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Mybatis 批量插入大量数据的最优方案

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By configuration.addLoaded Resource, Bindmapper ForNamespace, Parsepending ChacheRefs, parsePending Statements
| freewechat.com
Mybatis批量插入的方式有三种 普通插入 foreach 优化插入 ExecutorType.BATCH插入 下面对这三种分别进行比较: 1.普通插入 默认的插入方式是遍历insert语句，单条执行，效率肯定低下，如果成堆插入，更是性能有问题。 INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); INSERT INTO `table1` (`field1`, `field2`) VALUES ("data1", "data2"); sql log如下: 2022-08-30...
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MyBatis源码分析（二、续）SqlSource创建流程，SQL如何解析？如何将#{id}变成?的_秃了也弱了。的博客-CSDN博客

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By loadCustom Vfs, Loadcustom LogImpl, configuration.addLoaded Resource, Bindmapper ForNamespace
| CSDN
此处我们分析的sql： <select id="selectBlog" resultType="com.demo.Blog" useCache="true"> select * from blog where id = #{id} </select> 在处理配置文件时，会处理Mapper.xml文件： private void parseConfiguration(XNode root) { try { propertiesElement(root.evalNode("properties")); Properties settings = settingsAsProperties(root.evalNode("settings")); loadCustomVfs(settings); loadCustomLogImpl(settings); typeAliasesElement(root.evalNode("typeAliases")); pluginElement(root.evalNode("plugins"));...
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Mybatis批量插入大量数据最优方式_mybatis 批量插入_磊哥 低调的博客-CSDN博客

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By configuration.addLoaded Resource, Bindmapper ForNamespace, Parsepending ChacheRefs, parsePending Statements
| CSDN
Internally, it still generates the same single insert statement with many placeholders as the JDBC code above. MyBatis has an ability to cache PreparedStatement, but this statement cannot be cached because it contains element and the statement varies depending on the parameters. As a result, MyBatis has to 1) evaluate the foreach part and 2) parse the statement string to build parameter mapping [1] on every execution of this statement.
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Mybatis批量插入大量数据的最优方式总结_java_脚本之家

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By configuration.addLoaded Resource, Bindmapper ForNamespace, Parsepending ChacheRefs, parsePending Statements
| 脚本之家
Internally, it still generates the same single insert statement with many placeholders as the JDBC code above. MyBatis has an ability to cache PreparedStatement, but this statement cannot be cached because it contains element and the statement varies depending on the parameters. As a result, MyBatis has to 1) evaluate the foreach part and 2) parse the statement string to build parameter mapping [1] on every execution of this statement.
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