Java 配置hibernate.connection.provider\u类C3P0

我正在使用

Hibernate 5.4.3.Final

并希望在

Hibernate.cfg.xml

中配置

provider\u类

：

<property name="hibernate.connection.provider_class">
    <!-- path to C3P0ConnectionProvider class -->
</property>

---

您能否帮助我了解

C3P0ConnectionProvider

的值路径？

将这些依赖项添加到pom.xml：

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.4.3.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-c3p0</artifactId>
        <version>5.4.3.Final</version>
    </dependency>
   <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.1.2</version>
   </dependency>

---

这里要补充的是：它找不到provider_类的原因是它的路径不正确。它应该是-org.hibernate.c3p0.internal.C3P0ConnectionProvider。如果下载jar并取消jar，您将能够看到路径。

如果我添加

c3p0

依赖项，则不再需要声明

hibernate.connection.provider\u class

？是！！如果添加了c3p0依赖项，则不需要添加hibernate.connection.provider\u类。

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.4.3.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-c3p0</artifactId>
        <version>5.4.3.Final</version>
    </dependency>
   <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.1.2</version>
   </dependency>

<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
 <session-factory>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://localhost:3306/db?useSSL=false&amp;serverTimezone=UTC</property>
    <property name="connection.username">user</property>
    <property name="connection.password">password</property>
    <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
    <property name="show_sql">true</property>
    <!-- c3p0 connection pool -->
    <property name="hibernate.c3p0.min_size">1</property>
    <property name="hibernate.c3p0.max_size">100</property>
    <property name="hibernate.c3p0.timeout">200</property>
    <property name="hibernate.c3p0.max_statements">100</property>
    <property name="hibernate.c3p0.idle_test_period">5000</property>
</session-factory>
</hibernate-configuration>