What is mapper in MyBatis?

What is mapper in MyBatis?

Mapper XML is an important file in MyBatis, which contains a set of statements to configure various SQL statements such as select, insert, update, and delete. These statements are known as Mapped Statements or Mapped SQL Statements. All these Mapped SQL statements are resided within the element named.

What is MyBatis used for?

MyBatis is an open source persistence framework which simplifies the implementation of database access in Java applications. It provides the support for custom SQL, stored procedures and different types of mapping relations. Simply put, it’s an alternative to JDBC and Hibernate.

How does MyBatis work?

MyBatis does four main things: It executes SQL safely and abstracts away all the intricacies of JDBC. It maps parameter objects to JDBC prepared statement parameters. It maps rows in JDBC result sets to objects.

What is MyBatis generator?

MyBatis Generator (MBG) is a code generator for MyBatis MyBatis. It will generate code for all versions of MyBatis. It will introspect a database table (or many tables) and will generate artifacts that can be used to access the table(s). Java or Kotlin classes that match the table structure.

Is MyBatis a framework?

MyBatis is a Java persistence framework that couples objects with stored procedures or SQL statements using an XML descriptor or annotations. MyBatis is free software that is distributed under the Apache License 2.0.

Does MyBatis use prepared statements?

Same as above, MyBatis supports STATEMENT , PREPARED and CALLABLE statement types that map to Statement , PreparedStatement and CallableStatement respectively.

What is the difference between MyBatis and Hibernate?

Hibernate is an object-relational mapping framework (ORM) which maps Java classes to database tables. MyBatis is a persistence framework – not ORM. It maps SQL statements to Java methods.

What is MyBatis in spring boot?

MyBatis is a SQL Mapping framework with support for custom SQL, stored procedures and advanced mappings. SpringBoot doesn’t provide official support for MyBatis integration, but the MyBatis community built a SpringBoot starter for MyBatis.

How do you pass parameters in MyBatis?

When you want to pass multiple parameters in the method, you have to name the parameters with annotation: Configuration findByKeyAndUserId(@Param(“key”) String key, @Param(“userId”) Long userId); This annotation based syntax actually behave like a key-value map. Keys are provided by @Param.

What can I use MyBatis for in Java?

MyBatis eliminates almost all of the JDBC code and manual setting of parameters and retrieval of results. MyBatis can use simple XML or Annotations for configuration and map primitives, Map interfaces and Java POJOs (Plain Old Java Objects) to database records.”

What do I need to know about MyBatis insert mapper?

MyBatis provides various attributes for insert mapper, but largely we use id and parameter type. id is unique identifier used to identify the insert statement. On the other hand, parametertype is the class name or the alias of the parameter that will be passed into the statement.

What is the configuration XML file in MyBatis?

The configuration XML file contains settings for the core of the MyBatis system, including a DataSource for acquiring database Connection instances, as well as a TransactionManager for determining how transactions should be scoped and controlled.

What is the default value for automapping in MyBatis?

Default value: unset. autoMapping: If present, MyBatis will enable or disable automapping when mapping the result to this property. This attribute overrides the global autoMappingBehavior. Note that it has no effect on an external resultMap, so it is pointless to use it with select or resultMap attribute. Default value: unset.