spring-orm:6 HibernateJpaVendorAdapter源码解析

版本

spring-orm:6.1.3

源码

org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter

public class HibernateJpaVendorAdapter extends AbstractJpaVendorAdapter {// 旧版本Hibernate的方言类是否存在标识private static final boolean oldDialectsPresent = ClassUtils.isPresent("org.hibernate.dialect.PostgreSQL95Dialect", HibernateJpaVendorAdapter.class.getClassLoader());// jpa方言private final HibernateJpaDialect jpaDialect = new HibernateJpaDialect();...// 构建Jpa属性private Map<String, Object> buildJpaPropertyMap(boolean connectionReleaseOnClose) {Map<String, Object> jpaProperties = new HashMap<>();// 从 spring.jpa.database-platform 属性获取方言类名if (getDatabasePlatform() != null) {jpaProperties.put(AvailableSettings.DIALECT, getDatabasePlatform());}else {// 根据 spring.jpa.database 属性获取方言类Class<?> databaseDialectClass = determineDatabaseDialectClass(getDatabase());if (databaseDialectClass != null) {jpaProperties.put(AvailableSettings.DIALECT, databaseDialectClass.getName());}}// 如果设置了 spring.jpa.generate-ddl=true 则设置 hibernate.hbm2ddl.auto=updateif (isGenerateDdl()) {jpaProperties.put(AvailableSettings.HBM2DDL_AUTO, "update");}// 如果设置了 spring.jpa.show-sql=true, 则设置 hibernate.show_sql=trueif (isShowSql()) {jpaProperties.put(AvailableSettings.SHOW_SQL, "true");}// 如果需要在关闭会话时释放连接, 则设置 hibernate.connection.handling_mode=DELAYED_ACQUISITION_AND_HOLD (延迟获取，关闭会话时释放连接)if (connectionReleaseOnClose) {jpaProperties.put(AvailableSettings.CONNECTION_HANDLING,PhysicalConnectionHandlingMode.DELAYED_ACQUISITION_AND_HOLD);}// For SpringBeanContainer to be called on Hibernate 6.2jpaProperties.put("hibernate.cdi.extensions", "true");return jpaProperties;}// 根据数据库类型决定方言类protected Class<?> determineDatabaseDialectClass(Database database) {// 根据旧版本Hibernate的方言类是否存在判断Hibernate版本if (oldDialectsPresent) {  // Hibernate版本低于6.2return switch (database) {case DB2 -> DB2Dialect.class;case DERBY -> DerbyTenSevenDialect.class;case H2 -> H2Dialect.class;case HANA -> HANAColumnStoreDialect.class;case HSQL -> HSQLDialect.class;case INFORMIX -> Informix10Dialect.class;case MYSQL -> MySQL57Dialect.class;case ORACLE -> Oracle12cDialect.class;case POSTGRESQL -> PostgreSQL95Dialect.class;case SQL_SERVER -> SQLServer2012Dialect.class;case SYBASE -> SybaseDialect.class;default -> null;};}else {  // Hibernate版本高于6.2(包含)return switch (database) {case DB2 -> DB2Dialect.class;case DERBY -> org.hibernate.dialect.DerbyDialect.class;case H2 -> H2Dialect.class;case HANA -> HANAColumnStoreDialect.class;case HSQL -> HSQLDialect.class;case MYSQL -> MySQLDialect.class;case ORACLE -> OracleDialect.class;case POSTGRESQL -> org.hibernate.dialect.PostgreSQLDialect.class;case SQL_SERVER -> SQLServerDialect.class;case SYBASE -> SybaseDialect.class;default -> null;};}}