What is the method for performing joined queries in MyB…
The following methods are available in MyBatis for performing join queries.
- Using nested queries: You can achieve table joins by nesting subqueries within a query statement. For example, you can use a subquery in the SELECT statement to retrieve data related to the main query.
- Using join queries: You can connect multiple tables and perform queries by using the JOIN keyword in SQL. MyBatis supports using the JOIN keyword for multi-table join queries.
- Nesting Result Maps is the method of defining nested Result Maps within a ResultMap to achieve joining tables in a query. By utilizing nested Result Maps in the query statement, data from multiple tables can be mapped to a single object.
- Utilize one-to-one mapping: MyBatis allows for one-to-one mapping to achieve joining tables in a query. This type of mapping signifies a one-to-one relationship between two tables, where the result of the query will map data from both tables into a single object.
- Utilize one-to-many mapping: MyBatis can be used to achieve join queries with one-to-many mapping. This type of mapping indicates a relationship between two tables where one table’s data is mapped to an object and the other table’s multiple rows are mapped to a collection property of that object.
The above are common methods for MyBatis joins, the specific method used depends on the query requirements and data structure.
