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In this article, the editor introduces in detail "MyBatis how to configure multiple individual names typeAliasesPackage", the content is detailed, the steps are clear, and the details are handled properly. I hope that this "MyBatis how to configure multiple individual names typeAliasesPackage" article can help you solve your doubts. Let's follow the editor's ideas to learn new knowledge.

Configure multiple aliases typeAliasesPackage

You only need to separate it with a comma "and". Of course, take XML as an example. YML or Properties files can be configured in the same way.

Set typeAliasesPackage to support * * wildcard matching

The typeAliasesPackage property of mybatis searches for the specified package alias.

After configuring the resultType and parameterType in the xml file, we do not need to specify the full class name com.example.system.domain.SysUser, we just need to write SysUser and will search under the typeAliasesPackage package we configured.

Go to the MybatisProperties file and find that typeAliasesPackage is of type String.

@ ConfigurationProperties (prefix = MybatisProperties.MYBATIS_PREFIX) public class MybatisProperties {/ * * Packages to search type aliases. (Package delimiters are ",;\ t\ n") * / private String typeAliasesPackage

If you have more than one package, you can only assign values separated by commas, as follows:

Mybatis: typeAliasesPackage: com.example.system.domain,com.example.common.domain

Adhere to the practice of "don't want to type a little more code"

I don't want to add an extra package name after typeAliasesPackage every time.

What I want is whether I can configure a wildcard so that no matter how many packages are added, I don't have to reassign typeAliasesPackage.

Mybatis: # the rule is that the name of the newly added package must be com.example.xxx.domain typeAliasesPackage: com.example.**.domain

If we want to achieve this idea, we need to customize SqlSessionFactory, find all package names that match com.example.**.domain in code, and then assign values to typeAliasesPackage.

The code is implemented as follows:

Import java.io.IOException;import java.util.ArrayList;import java.util.HashSet;import java.util.List;import javax.sql.DataSource;import org.apache.ibatis.io.VFS;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.boot.autoconfigure.SpringBootVFS;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.env.Environment Import org.springframework.core.io.DefaultResourceLoader;import org.springframework.core.io.Resource;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.core.io.support.ResourcePatternResolver;import org.springframework.core.type.classreading.CachingMetadataReaderFactory;import org.springframework.core.type.classreading.MetadataReader;import org.springframework.core.type.classreading.MetadataReaderFactory;import org.springframework.util.ClassUtils / * * Mybatis supports * matching scan packages * * @ author ruoyi * / @ Configurationpublic class MyBatisConfig {@ Autowired private Environment env; static final String DEFAULT_RESOURCE_PATTERN = "* * / * .class" / * * Custom typeAliasesPackage * the value of typeAliasesPackage in application.yml is equal to com.ruoyi.**.domain * but mybatis does not recognize * * wildcards * need our own implementation to match to all domain packages * * @ param typeAliasesPackage * @ return * / public static String setTypeAliasesPackage (String typeAliasesPackage) {ResourcePatternResolver resolver = (ResourcePatternResolver) new PathMatchingResourcePatternResolver () MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory (resolver); List allResult = new ArrayList (); try {for (String aliasesPackage: typeAliasesPackage.split (",")) {List result = new ArrayList (); aliasesPackage = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + ClassUtils.convertClassNameToResourcePath (aliasesPackage.trim ()) + "/" + DEFAULT_RESOURCE_PATTERN Resource [] resources = resolver.getResources (aliasesPackage); if (resources! = null & & resources.length > 0) {MetadataReader metadataReader = null; for (Resource resource: resources) {if (resource.isReadable ()) {metadataReader = metadataReaderFactory.getMetadataReader (resource) Try {result.add (Class.forName (metadataReader.getClassMetadata (). GetClassName ()). GetPackage (). GetName ());} catch (ClassNotFoundException e) {e.printStackTrace () }} if (result.size () > 0) {HashSet hashResult = new HashSet (result); allResult.addAll (hashResult) }} if (allResult.size () > 0) {typeAliasesPackage = String.join (",", (String []) allResult.toArray (new String [0]));} else {throw new RuntimeException ("mybatis typeAliasesPackage path scan error, parameter typeAliasesPackage:" + typeAliasesPackage + "No packets found") }} catch (IOException e) {e.printStackTrace ();} return typeAliasesPackage;} @ Bean public SqlSessionFactory sqlSessionFactory (DataSource dataSource) throws Exception {/ / get the value of mybatis.typeAliasesPackage defined in the configuration file String typeAliasesPackage = env.getProperty ("mybatis.typeAliasesPackage") / / get the value of mybatis.mapperLocations defined in configuration file String mapperLocations = env.getProperty ("mybatis.mapperLocations"); / / get the value of mybatis.configLocation defined in configuration file String configLocation = env.getProperty ("mybatis.configLocation"); typeAliasesPackage = setTypeAliasesPackage (typeAliasesPackage); VFS.addImplClass (SpringBootVFS.class); final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean (); sessionFactory.setDataSource (dataSource) SessionFactory.setTypeAliasesPackage (typeAliasesPackage); / / find all xml files ending in Mapper.xml under the classpath of all jar packages: sessionFactory.setMapperLocations (new PathMatchingResourcePatternResolver (). GetResources (mapperLocations)); sessionFactory.setConfigLocation (new DefaultResourceLoader (). GetResource (configLocation)); return sessionFactory.getObject () }} after reading this, the article "how to configure multiple individual typeAliasesPackage with MyBatis" has been introduced. If you want to master the knowledge points of this article, you still need to practice and use it yourself. If you want to know more about related articles, welcome to follow the industry information channel.

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