Mybatis – learning notes

configuration file

　　　　1. Properties introduces the contents of the external properties configuration file

Resource: introduce resources under the classpath

URL: introduce network path or disk path

　　　　2. Settings contains many important settings

Setting: used to set each item

Name: set item name

Value: set item value

Typealias aliases a Java type type: Specifies the class to be aliased - the default alias is the class name, and the small employeealias specifies a new name

Package aliases all classes under a package

Name: specify the package name (give a default alias (class name in lowercase) to all classes of the current package and descendant packages)

The @ alias annotation assigns a new alias to a class

　　　　3. The typealiases alias handler can alias our Java classes

(aliases are not case sensitive)

　　　　4. Environments: mybatis can configure multiple environments. Default specifies a certain environment. You can quickly switch the environment and configure a specific environment information,

There must be two labels. The ID represents the unique of the current environment, indicating the transactionmanager transaction manager type transaction manager type datasource data source

　　　　5. Databaseidprovider supports multi database vendors

Type = "db_vendor" mybatis will execute SQL according to the database vendor ID