MyBatis Field Mapping Explained

The main principle of MyBatis field mapping is defining the mapping relationship between entity classes and database tables through configuration files (xml or annotations). With this configuration, MyBatis can automatically map column values from the query result set to corresponding entity class properties, thereby achieving automatic result set encapsulation.

In the configuration file, you can define the mapping relationship between fields and properties using the resultMap element or annotation. For example, you can specify the correspondence between field names and property names, or between field types and property types. When executing a query, MyBatis will use the mapping relationships defined in the configuration file to map the column values in the query result set to the properties of the entity class, and return the encapsulated entity object.

In general, the principle of MyBatis field mapping is to define the mapping relationship between entity classes and database tables through configuration files, and then automatically map the column values in the result set to the properties of the entity class based on these configurations during query operations, achieving automatic encapsulation and mapping of data.