小编Chu*_*ski的帖子

我正在尝试使用新的Tomcat 7.0 JDBC连接池和MySql.它在这里说你可以将最新的tomcat-jdbc.jar放到Tomcat 6.0环境中的tomcat/lib目录中,这就是我所做的.

我正在使用Spring来初始化并实例化Web上的每个示例的DataSource:

<bean id="myDataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close" 
p:driverClassName="${driver_class}"
p:url="${url}"
p:username="${username?root}"
p:password="${password}"
p:initialSize="10"
p:initSQL="SELECT DTS FROM DT_TM_TS FOR READ ONLY WITH UR"
p:minIdle="10"
p:maxIdle="100"
p:maxActive="100"
p:maxWait="6000"
p:jmxEnabled="true"
p:jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
p:removeAbandoned="true"
p:removeAbandonedTimeout="60"
p:logAbandoned="true"
p:testOnBorrow="true"
p:testOnReturn="false"
p:testWhileIdle="false"
p:useEquals="false"
p:fairQueue="false"
p:timeBetweenEvictionRunsMillis="30000"
p:minEvictableIdleTimeMillis="30000"
p:validationInterval="1800000"
p:validationQuery="SELECT DTS FROM DT_TM_TS FOR READ ONLY WITH UR"
/>   

但是,当我尝试连接到数据库时,它会抛出此异常:

java.sql.SQLException: "com.mysql.jdbc.Driver"
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:243)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:176)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:647)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:589)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:452)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:130)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:99)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:110)
    at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:46)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:111)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2101)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1325)
    at …

假设我有一个 TeacherRepository，它需要根据下面的代码使用 CourseRepository。教师和课程形成多对多的关系。教师和课程不形成聚合。你会认为这种模式的正确使用吗？

class TeacherRepository {

    @Inject(@Named("courseRepository"))
    private final CourseRepository courseRepository;

    public void addCourseToTeachers(String courseName) {

      Course course = courseRepository.findByName(courseName);

      for (Teacher teacher : readAll()) 
        teacher.addCourse(course);
    } 
}