问题描述
我想在我的应用程序和 Oracle 数据库之间建立连接.我没有以下数据库信息:
I want to set up a connection between my application and a Oracle database. I do not have the following database information:
- 网址
- 用户名
- 密码
通过使用 Blackboard 提供的 API,我可以检索到一个有效的 java.sql.Connection
.
What I can retrieve is a valid java.sql.Connection
by using the API provided by Blackboard.
这种情况下可以设置mybatis吗?
Is it possible to set up mybatis in this case?
我正在使用如下所示的配置:
I am using the configuration shown below:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="useGeneratedKeys" value="true"/>
<setting name="jdbcTypeForNull" value="NULL"/>
</settings>
<typeAliases>
<typeAlias alias="assignment" type="simpleproj.assignment.model.Assignment"/>
<typeAlias alias="assignmentLog" type="simpleproj.assignment.model.AssignmentLog"/>
</typeAliases>
<mappers>
<mapper resource="simpleproj/assignment/model/Assignment.xml" />
</mappers>
</configuration>
这就是我如何获得一个新的 SqlSessionFactory
实例:
This is how I get a new SqlSessionFactory
instance:
String resource = "mybatis-config.xml";
Reader reader = Resources.getResourceAsReader(resource);
return new SqlSessionFactoryBuilder().build(reader, "assignment");
之后,我尝试通过此代码检索会话:
Afterwards, I try to retrieve a session by this code:
session = sqlSessionFactory.openSession(connection);
我已检查 connection
是否有效:
I have checked that the connection
is valid with:
connection.isValid(3);
,返回真- 一个
PreparedStatement
可以成功执行
connection.isValid(3);
, which returns true- a
PreparedStatement
can be executed successfully
但是,sqlSessionFactory.openSession(connection)
会产生错误,堆栈跟踪如下:
However, sqlSessionFactory.openSession(connection)
generates errors with the following stack trace:
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error opening session. Cause: java.lang.reflect.UndeclaredThrowableException
### Cause: java.lang.reflect.UndeclaredThrowableException
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromConnection(DefaultSqlSessionFactory.java:102)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:67)
at simpleproj.assignment.dao.DatabaseDAO.getSession(DatabaseDAO.java:55)
at simpleproj.assignment.dao.DatabaseDAO.deleteAssignmentList(DatabaseDAO.java:124)
at simpleproj.assignment.AssignmentLoader.importData(AssignmentLoader.java:85)
at simpleproj.assignment.AssignmentLoader.main(AssignmentLoader.java:49)
Caused by: java.lang.reflect.UndeclaredThrowableException
at $Proxy7.getAutoCommit(Unknown Source)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromConnection(DefaultSqlSessionFactory.java:99)
... 5 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at blackboard.db.ConnectionManager$ConnectionProxy.invoke(ConnectionManager.java:1419)
... 7 more
Caused by: java.sql.SQLException: Connection oracle.jdbc.driver.LogicalConnection@1627c16 is closed.
at org.apache.commons.dbcp.DelegatingConnection.checkOpen(DelegatingConnection.java:398)
at org.apache.commons.dbcp.DelegatingConnection.getAutoCommit(DelegatingConnection.java:337)
... 11 more
推荐答案
从此错误:oracle.jdbc.driver.LogicalConnection@1627c16 is closed.当您将它传递给 sqlSessionFactoryBean 时,此连接已关闭.可以调用connection.getAutoCommit()测试连接是否支持事务.
From this error:oracle.jdbc.driver.LogicalConnection@1627c16 is closed.This connection is closed when you passed it to sqlSessionFactoryBean.You can call connection.getAutoCommit() to test the connection whether it support transaction.
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