A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
字段类型处理器 在 MyBatis 中，类型处理器（TypeHandler）扮演着 JavaType 与 JdbcType 之间转换的桥梁角色。 它们用于在执行 SQL 语句时，将 Java 对象的值设置到 PreparedStatement 中，或者从 ResultSet 或 CallableStatement 中取出值。
每当 MyBatis 在执行 SQL 操作时，都会使用 TypeHandler 来确保数据类型的正确转换。 在执行 SQL 语句时，TypeHandler 将 Java 类型转换为数据库可以理解的类型。 在读取数据库结果时，TypeHandler 将数据库类型转换回 Java 类型。
文章浏览阅读2.4w次，点赞50次，收藏107次。 本文详细介绍了如何使用MyBatis Plus的注解方式实现自定义TypeHandler，包括自定义类、枚举和集合的类型转换，帮助开发者避免XML配置，提升开发效率。
MyBatis 作为一个优秀的 ORM框架，提供了 TypeHandler 机制来处理复杂的数据类型。 这篇文章将深入探讨MyBatis TypeHandler的使用方法，并通过实际的代码示例来讲解其在微服务中的应用。
MyBatis的TypeHandler接口用于处理Java与JDBC类型转换，支持常见数据类型并允许自定义处理特殊类型。 TypeHandler在参数设置和结果获取中起关键作用，内置多种TypeHandler，且易于自定义和扩展，适用于复杂数据类型转换和不同数据库兼容性需求。
本文详细阐述MyBatis TypeHandler的核心工作原理，并提供从创建、注册到在Spring Boot中应用的完整自定义实践指南，助您灵活解决复杂数据类型映射问题。
MyBatis 的 TypeHandler 是一个重要的特性，它负责 Java 类型和数据库类型之间的映射，使得开发者可以自定义如何在 Java 对象和数据库类型之间转换数据。 使用场景 TypeHandler 最常见的使用场景包括： 处理 Java 中不存在的数据库特定类型。
字段类型处理器 在 MyBatis 中，类型处理器（TypeHandler）扮演着 JavaType 与 JdbcType 之间转换的桥梁角色。 它们用于在执行 SQL 语句时，将 Java 对象的值设置到 PreparedStatement 中，或者从 ResultSet 或 CallableStatement 中取出值。
本文主要介绍了 MyBatis 中 TypeHandler 的相关知识，包括其工作原理、自定义 TypeHandler 的编写及注册方式。 以 MySQL 的 JSON 数据类型为例进行示范，强调了 TypeHandler 在处理特殊数据格式时的优势，如确保数据准确转换、提升代码维护性等，还提到要注意数据 ...
一、TypeHandler 核心原理 1.1 定位与作用 TypeHandler 是 MyBatis 类型转换体系的基石，负责在 SQL 执行的两个关键阶段完成类型映射： 入参转换：在 insert update 等操作中，将 Java 对象转换为 JDBC 支持的类型，通过 PreparedStatement.setXxx() 方法设置参数。
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