What is the purpose of MyBatis JDBC Type in English?

The JDBCType enum in MyBatis is used to specify the type of database field. Its purpose is to indicate to MyBatis how to convert Java objects into database field values, and how to convert database field values into Java objects.

JDBCType specifies various database field types such as integers, strings, dates, and times. When performing database operations with MyBatis, specifying the data type of a field using JDBCType allows MyBatis to accurately perform data type conversion.

For instance, when defining a Java object property as an integer type, JDBCType.INTEGER can be used to specify that the corresponding database field type is an integer. This way, during data insertion or retrieval, MyBatis will automatically convert the integer property of the Java object to the integer value of the database field, and vice versa when reading data from the database.

In conclusion, the purpose of JDBCType is to ensure the correct conversion of data types between Java objects and database fields so that MyBatis can interact correctly with the database.