绝对可以使用 C3P0，这是为企业解决方案开发的。要检查优势，您可以遵循此答案。
这是集成的示例代码：
@Bean
public JpaTransactionManager transactionManager() {
JpaTransactionManager transactionManager =
new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
return transactionManager;
}
这个 Bean 用于获取JpaTransactionManager.
@Primary
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource());
entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
entityManagerFactoryBean.setPackagesToScan("YOUR.DATABSE.ENTITY.PACKAGE");
entityManagerFactoryBean.setJpaProperties(hibProperties());
return entityManagerFactoryBean;
}
这个 Bean 用于获取LocalContainerEntityManagerFactoryBean. 它需要DataSource, PersistenceProviderClass, 实体包名称PackagesToScan和 JpaProperties 来自hibProperties().
@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
return new PersistenceExceptionTranslationPostProcessor();
}
private Properties hibProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
properties.put("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
properties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
return properties;
}
在这里，env value are comming from application.properties。
检查波纹管属性：
hibernate.dialect: org.hibernate.dialect.Oracle12cDialect
hibernate.show_sql: false
hibernate.hbm2ddl.auto: none
主要部分是数据源设置。下面给出：
@Bean
public ComboPooledDataSource dataSource(){
ComboPooledDataSource dataSource = new ComboPooledDataSource();
try {
dataSource.setDriverClass(env.getProperty("db.driver"));
dataSource.setJdbcUrl(env.getProperty("db.url"));
dataSource.setUser(env.getProperty("db.username"));
dataSource.setPassword(env.getProperty("db.password"));
dataSource.setMinPoolSize(Integer.parseInt(env.getProperty("minPoolSize")));
dataSource.setMaxPoolSize(Integer.parseInt(env.getProperty("maxPoolSize")));
dataSource.setMaxIdleTime(Integer.parseInt(env.getProperty("maxIdleTime")));
dataSource.setMaxStatements(Integer.parseInt(env.getProperty("maxStatements")));
dataSource.setMaxStatementsPerConnection(Integer.parseInt(env.getProperty("maxStatementsPerConnection")));
dataSource.setMaxIdleTimeExcessConnections(10000);
} catch (PropertyVetoException e) {
e.printStackTrace();
}
return dataSource;
}
它使用ComboPooledDataSource了许多更重要的参数，如 maxPoolSize、MinPoolSize、MaxIdleSize 等。
它的环境参数如下所示：
db.driver: oracle.jdbc.driver.OracleDriver // for Oracle
db.username: YOUR_USER_NAME
db.password: YOUR_USER_PASSWORD
db.url: DATABASE_URL
minPoolSize:5 // number of minimum poolSize
maxPoolSize:100 // number of maximum poolSize
maxIdleTime:5 // In seconds. After that time it will realease the unused connection.
maxStatements:1000
maxStatementsPerConnection:100
maxIdleTimeExcessConnections:10000
这是完整的工作示例代码：
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.hibernate.jpa.HibernatePersistenceProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.*;
import org.springframework.core.env.Environment;
import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.sql.DataSource;
import java.beans.PropertyVetoException;
import java.util.Properties;
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories
@PropertySource("classpath:application.properties")
@Scope("singleton")
public class TestDataSource {
@Autowired
private Environment env;
@Qualifier("dataSource")
@Autowired
private DataSource dataSource;
@Bean
public JpaTransactionManager transactionManager() {
JpaTransactionManager transactionManager =
new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
return transactionManager;
}
@Primary
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource());
entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
entityManagerFactoryBean.setPackagesToScan("YOUR.PACKAGE.NAME");
entityManagerFactoryBean.setJpaProperties(hibProperties());
return entityManagerFactoryBean;
}
@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
return new PersistenceExceptionTranslationPostProcessor();
}
@Bean
public ComboPooledDataSource dataSource(){
ComboPooledDataSource dataSource = new ComboPooledDataSource();
try {
dataSource.setDriverClass(env.getProperty("db.driver"));
dataSource.setJdbcUrl(env.getProperty("db.url"));
dataSource.setUser(env.getProperty("db.username"));
dataSource.setPassword(env.getProperty("db.password"));
dataSource.setMinPoolSize(Integer.parseInt(env.getProperty("minPoolSize")));
dataSource.setMaxPoolSize(Integer.parseInt(env.getProperty("maxPoolSize")));
dataSource.setMaxIdleTime(Integer.parseInt(env.getProperty("maxIdleTime")));
dataSource.setMaxStatements(Integer.parseInt(env.getProperty("maxStatements")));
dataSource.setMaxStatementsPerConnection(Integer.parseInt(env.getProperty("maxStatementsPerConnection")));
dataSource.setMaxIdleTimeExcessConnections(10000);
} catch (PropertyVetoException e) {
e.printStackTrace();
}
return dataSource;
}
private Properties hibProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
properties.put("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
properties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
return properties;
}
}
另一件事。这是毕业链接
compile group: 'org.hibernate', name: 'hibernate-c3p0', version: '5.2.10.Final'
希望这会帮助你。谢谢 ：）