Hibernate命名策略

Posted 2020-08-29

hibernate的命名策略，可以减少对数据库标识符命名的维护，进一步减少这部份命名的重复性代码量，以提高维护。

hibernate的命名方式，有两类，一类是显式命名，一类是隐式命名。

• 显式命名：在映射配置时，设置的数据库表名，列名等，就是进行显式命名。
• 隐式命名：显式命名一般不是必要的，所以可以选择当不设置名称，这时就交由hibernate进行隐式命名，另外隐式命名还包括那些不能进行显式命名的数据库标识符。接口ImplicitNamingStrategy，就是用于实现隐式命名。
• 过滤命名：接口PhysicalNamingStrategy，用于对显式命名或隐式命名进一步过滤处理。

 

示例：

TestTable1Impl.java

@Entity
// 隐式命名表名
@Table
public class TestTable1Impl {
    //---------------------------------------------------------------
    // Field
    //---------------------------------------------------------------
    
    @Id
    @Column()
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long testId;
    
    @Column(length = 20)
    private String testName;
    
    @ManyToOne
    private TestTable2Impl testForeign;
    
    //---------------------------------------------------------------
    // Method
    //---------------------------------------------------------------

    public Long getId() {
        return testId;
    }

    public void setId(Long id) {
        this.testId = id;
    }
    
    public String getName(){
        return testName;
    }
    
    public void setName(String name){
        this.testName = name;
    }

    public TestTable2Impl getTestForeign() {
        return testForeign;
    }

    public void setTestForeign(TestTable2Impl testForeign) {
        this.testForeign = testForeign;
    }
}

TestTable2Impl.java

@Entity
// 显式命名表名
@Table(name = "TestTable2Impl")
public class TestTable2Impl {
    //---------------------------------------------------------------
    // Field
    //---------------------------------------------------------------
    
    @Id
    @Column()
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long testId;
    
    @Column(length = 20)
    private String testName;
    
    //---------------------------------------------------------------
    // Method
    //---------------------------------------------------------------
    
    public Long getId() {
        return testId;
    }

    public void setId(Long id) {
        this.testId = id;
    }
    
    public String getName(){
        return testName;
    }
    
    public void setName(String name){
        this.testName = name;
    }
}

MyImplicitNamingStrategyImpl.java

public class MyImplicitNamingStrategyImpl extends ImplicitNamingStrategyJpaCompliantImpl implements ImplicitNamingStrategy {

    @Override
    public Identifier determinePrimaryTableName(ImplicitEntityNameSource source) {
        Identifier name = super.determinePrimaryTableName(source);
        Identifier result = toStandard(name, "Impl");
        System.out.println("ImplicitNamingStrategy / PrimaryTableName -> \n\t" + name + " => " + result);
        return result;
    }
    
    private Identifier toStandard(Identifier name, String... removeSuffixes){
        if(removeSuffixes == null)
            return name;
        
        if(name == null)
            return null;

        String text = name.getText();
        if(removeSuffixes != null){
            for(String suffix : removeSuffixes){
                if(text.endsWith(suffix))
                    text = text.substring(0, text.length() - suffix.length());
            }
        }
        return new Identifier(text, name.isQuoted());
    }

    @Override
    public Identifier determineJoinTableName(ImplicitJoinTableNameSource source) {
        Identifier name = super.determineJoinTableName(source);
        System.out.println("ImplicitNamingStrategy / JoinTableName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineCollectionTableName(ImplicitCollectionTableNameSource source) {
        Identifier name = super.determineCollectionTableName(source);
        System.out.println("ImplicitNamingStrategy / CollectionTableName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineDiscriminatorColumnName(ImplicitDiscriminatorColumnNameSource source) {
        Identifier name = super.determineDiscriminatorColumnName(source);
        System.out.println("ImplicitNamingStrategy / DiscriminatorColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineTenantIdColumnName(ImplicitTenantIdColumnNameSource source) {
        Identifier name = super.determineTenantIdColumnName(source);
        System.out.println("ImplicitNamingStrategy / TenantIdColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineIdentifierColumnName(ImplicitIdentifierColumnNameSource source) {
        Identifier name = super.determineIdentifierColumnName(source);
        System.out.println("ImplicitNamingStrategy / IdentifierColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineBasicColumnName(ImplicitBasicColumnNameSource source) {
        Identifier name = super.determineBasicColumnName(source);
        System.out.println("ImplicitNamingStrategy / BasicColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineJoinColumnName(ImplicitJoinColumnNameSource source) {
        Identifier name = super.determineJoinColumnName(source);
        final String result;

        if ( source.getNature() == ImplicitJoinColumnNameSource.Nature.ELEMENT_COLLECTION || source.getAttributePath() == null ) {
            result = transformEntityName( source.getEntityNaming() );
        } else {
            result = transformAttributePath( source.getAttributePath() );
        }

        System.out.println("ImplicitNamingStrategy / JoinColumnName -> \n\t" + name + " => " + result);
        return toIdentifier( result, source.getBuildingContext() );
    }

    @Override
    public Identifier determinePrimaryKeyJoinColumnName(ImplicitPrimaryKeyJoinColumnNameSource source) {
        Identifier name = super.determinePrimaryKeyJoinColumnName(source);
        System.out.println("ImplicitNamingStrategy / PrimaryKeyJoinColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineAnyDiscriminatorColumnName(ImplicitAnyDiscriminatorColumnNameSource source) {
        Identifier name = super.determineAnyDiscriminatorColumnName(source);
        System.out.println("ImplicitNamingStrategy / AnyDiscriminatorColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineAnyKeyColumnName(ImplicitAnyKeyColumnNameSource source) {
        Identifier name = super.determineAnyKeyColumnName(source);
        System.out.println("ImplicitNamingStrategy / AnyKeyColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineMapKeyColumnName(ImplicitMapKeyColumnNameSource source) {
        Identifier name = super.determineMapKeyColumnName(source);
        System.out.println("ImplicitNamingStrategy / MapKeyColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineListIndexColumnName(ImplicitIndexColumnNameSource source) {
        Identifier name = super.determineListIndexColumnName(source);
        System.out.println("ImplicitNamingStrategy / ListIndexColumnName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineForeignKeyName(ImplicitForeignKeyNameSource source) {
        Identifier name = super.determineForeignKeyName(source);
        String result = null;
        String tableName = source.getTableName().getText();
        if(tableName.startsWith(TableNamingConfig.TABLE_PREFIX))
            tableName = tableName.substring(TableNamingConfig.TABLE_PREFIX.length());
        if(source.getColumnNames().size() == 1){
            result = TableNamingConfig.FOREIGN_KEY_PREFIX + tableName + "_" + source.getColumnNames().get(0).getText();
        } else  {
            String columnName = source.getReferencedTableName().getText();
            if(columnName.startsWith(TableNamingConfig.TABLE_PREFIX))
                columnName = columnName.substring(TableNamingConfig.TABLE_PREFIX.length());
            result = TableNamingConfig.FOREIGN_KEY_PREFIX + tableName + "_" + columnName;
        }
        System.out.println("ImplicitNamingStrategy / ForeignKeyName -> \n\t" + name + " => " + result);
        return new Identifier(result, name.isQuoted());
    }

    @Override
    public Identifier determineUniqueKeyName(ImplicitUniqueKeyNameSource source) {
        Identifier name = super.determineUniqueKeyName(source);
        System.out.println("ImplicitNamingStrategy / UniqueKeyName -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier determineIndexName(ImplicitIndexNameSource source) {
        Identifier name = super.determineIndexName(source);
        System.out.println("ImplicitNamingStrategy / IndexName -> \n\t" + name);
        return name;
    }

}

MyPhysicalNamingStrategyImpl.java

public class MyPhysicalNamingStrategyImpl implements PhysicalNamingStrategy {

    @Override
    public Identifier toPhysicalCatalogName(Identifier name, JdbcEnvironment jdbcEnvironment) {
        System.out.println("PhysicalNamingStrategy / catalog -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier toPhysicalSchemaName(Identifier name, JdbcEnvironment jdbcEnvironment) {
        System.out.println("PhysicalNamingStrategy / schema -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment jdbcEnvironment) {
        Identifier result = toStandard(name, "tb_");
        System.out.println("PhysicalNamingStrategy / table -> \n\t" + name + " => " + result);
        return result;
    }

    @Override
    public Identifier toPhysicalSequenceName(Identifier name, JdbcEnvironment jdbcEnvironment) {
        System.out.println("PhysicalNamingStrategy / sequence -> \n\t" + name);
        return name;
    }

    @Override
    public Identifier toPhysicalColumnName(Identifier name, JdbcEnvironment jdbcEnvironment) {
        Identifier result = toStandard(name);
        System.out.println("PhysicalNamingStrategy / column -> \n\t" + name + " => " + result);
        return result;
    }
    
    private Identifier toStandard(Identifier name){
        return toStandard(name, null);
    }
    
    private Identifier toStandard(Identifier name, String prefix){
        if(name == null)
            return null;

        String text = name.getText();
        StringBuffer buffer = new StringBuffer();
        if(prefix != null)
            buffer.append(prefix);
        
        char[] chars = text.toCharArray();
        for(int i=0, len=chars.length; i<len; i++){
            char c1 = chars[i];
            if(c1 >= ‘A‘ && c1 <= ‘Z‘){
                if(i > 0 && i + 1 < len){
                    if(chars[i + 1] < ‘A‘ || chars[i + 1] > ‘Z‘)
                        buffer.append(‘_‘);
                }
                c1 = (char) (c1 - ‘A‘ + ‘a‘);
            }
            buffer.append(c1);
        }
        return new Identifier(buffer.toString(), name.isQuoted());
    }

}

TableNamingConfig.java

public class TableNamingConfig {
    public static final String TABLE_PREFIX = "tb_";
    public static final String FOREIGN_KEY_PREFIX = "fk_";
}

spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.1.xsd">

    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useSSL=false"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
    
    <bean id="physicalNamingStrategy" class="test.MyPhysicalNamingStrategyImpl"></bean>
    <bean id="implicitNamingStrategy" class="test.MyImplicitNamingStrategyImpl"></bean>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan">
            <list>
                <!-- 可以加多个包 -->
                <value>test</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.hbm2ddl.auto">create-drop</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.temp.use_jdbc_metadata_defaults">false</prop>
            </props>
        </property>
        <property name="physicalNamingStrategy" ref="physicalNamingStrategy"></property>
        <property name="implicitNamingStrategy" ref="implicitNamingStrategy"></property>
    </bean>
</beans>

Test.java

public class Test {
    public static void main(String[] params){
        // 命名策略
        new Test().test();
        /*
            PhysicalNamingStrategy / catalog -> 
                null
            PhysicalNamingStrategy / catalog -> 
                null
            PhysicalNamingStrategy / column -> 
                DTYPE => dtype
            ImplicitNamingStrategy / PrimaryTableName -> 
                TestTable1Impl => TestTable1
            PhysicalNamingStrategy / table -> 
                TestTable1 => tb_test_table1
            ImplicitNamingStrategy / BasicColumnName -> 
                testId
            PhysicalNamingStrategy / column -> 
                testId => test_id
            ImplicitNamingStrategy / BasicColumnName -> 
                testId
            ImplicitNamingStrategy / BasicColumnName -> 
                testForeign
            PhysicalNamingStrategy / column -> 
                testForeign => test_foreign
            ImplicitNamingStrategy / BasicColumnName -> 
                testName
            PhysicalNamingStrategy / column -> 
                testName => test_name
            ImplicitNamingStrategy / BasicColumnName -> 
                testName
            PhysicalNamingStrategy / column -> 
                DTYPE => dtype
            PhysicalNamingStrategy / table -> 
                TestTable2Impl => tb_test_table2_impl
            ImplicitNamingStrategy / BasicColumnName -> 
                testId
            PhysicalNamingStrategy / column -> 
                testId => test_id
            ImplicitNamingStrategy / BasicColumnName -> 
                testId
            ImplicitNamingStrategy / BasicColumnName -> 
                testName
            PhysicalNamingStrategy / column -> 
                testName => test_name
            ImplicitNamingStrategy / BasicColumnName -> 
                testName
            ImplicitNamingStrategy / JoinColumnName -> 
                testForeign_testId => testForeign
            PhysicalNamingStrategy / column -> 
                testForeign => test_foreign
            ImplicitNamingStrategy / ForeignKeyName -> 
                FKlnurug7wfle1u6fc5oulnrx94 => fk_test_table1_test_foreign
                
            Hibernate: 
                alter table tb_test_table1 
                   drop 
                   foreign key fk_test_table1_test_foreign
                   
            Hibernate: 
                drop table if exists tb_test_table1
                
            Hibernate: 
                drop table if exists tb_test_table2_impl
                
            Hibernate: 
                create table tb_test_table1 (
                   test_id bigint not null auto_increment,
                    test_name varchar(20),
                    test_foreign bigint,
                    primary key (test_id)
                )
                
            Hibernate: 
                create table tb_test_table2_impl (
                   test_id bigint not null auto_increment,
                    test_name varchar(20),
                    primary key (test_id)
                )
                
            Hibernate: 
                alter table tb_test_table1 
                   add constraint fk_test_table1_test_foreign 
                   foreign key (test_foreign) 
                   references tb_test_table2_impl (test_id)
                   
            Hibernate: 
                alter table tb_test_table1 
                   drop 
                   foreign key fk_test_table1_test_foreign
                   
            Hibernate: 
                drop table if exists tb_test_table1
                
            Hibernate: 
                drop table if exists tb_test_table2_impl
         */
    }

    public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml", this.getClass());
        SessionFactory factory = null;
        try {
            factory = (SessionFactory) context.getBean("sessionFactory");
        } finally {
            if(factory != null){
                factory.close();
                factory = null;
            }
        }
    }
}