DB2 和 MyBatis 连接被拒绝：连接。错误代码=-4499，SQLSTATE=08001
DB2 and MyBatis Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
尝试通过 mybatis 使用 eclipse 连接到 DB2 中的数据库 returns 我这个错误：
### Error opening session. Cause: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
可以使用 DB2 控制台访问数据库，我已经将 DB2COMM 设置为 TCPIP，但仍然不起作用
test.java
public class Test {
public static void main(String[] args){
Reader reader = null;
SqlSessionFactory sqlSessionFactory = null;
SqlSession session = null;
try {
reader = Resources.getResourceAsReader("mybatis-config.xml");
} catch (IOException e) {
System.out.println("MyBatis config not found!");
e.printStackTrace();
}
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
session = sqlSessionFactory.openSession();
User user = new User();
user.setName("second");
user.setNumber(2);
session.insert("User.addNew", user);
int num = session.selectOne("User.getNumber", "second");
System.out.println(num);
session.close();
}
}
mapper.xml
<mapper namespace="User">
<resultMap type="int" id="resultNumber">
<result property="number" column="NUMBER" />
</resultMap>
<resultMap type="User" id="resultUser">
<result property="name" column="NAME" />
<result property="number" column="NUMBER" />
</resultMap>
<select id="getNumber" parameterType="String" resultMap="resultNumber">
SELECT number
FROM mp.mybatis
WHERE name = #{name}
</select>
<select id="getUser" parameterType="String" resultMap="resultUser">
SELECT *
FROM mp.mybatis
WHERE name = #{name}
</select>
<insert id="addNew" parameterType="User">
INSERT INTO mp.mybatis (name, number)
VALUES (#{name}, #{number})
</insert>
<update id="updateUser" parameterType="map">
UPDATE mp.mybatis
SET name = #{new.name}, number = #{new.number}
WHERE name = #{old.name} AND number = #{old.number}
</update>
<delete id="deleteUser" parameterType="String">
DELETE FROM mp.mybatis
WHERE name = #{name}
</delete>
</mapper>
mybatis-config
<?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>
<properties resource='jdbc.properties' />
<typeAliases>
<typeAlias type='com.MyBatisMP.POJO.User' alias='User'></typeAlias>
</typeAliases>
<environments default='development'>
<environment id='development'>
<transactionManager type='JDBC' />
<dataSource type='POOLED'>
<property name='driver' value='${jdbc.driverClassName}' />
<property name='url' value='${jdbc.url}' />
<property name='username' value='${jdbc.username}' />
<property name='password' value='${jdbc.password}' />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource='com/MyBatisMP/Mapper/UserMapper.xml' />
</mappers>
</configuration>
jdbc.properties
jdbc.driverClassName=com.ibm.db2.jcc.DB2Driver
jdbc.url=jdbc:db2://localhost:50000/mp
jdbc.username=XXX
jdbc.password=XXX
数据库名为 "mp"，table 为 "mybatis"
完整的错误信息
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error opening session. Cause: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
### Cause: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:81)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:32)
at com.MyBatisMP.Test.Test.main(Test.java:27)
Caused by: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
at com.ibm.db2.jcc.am.kd.a(Unknown Source)
at com.ibm.db2.jcc.am.kd.a(Unknown Source)
at com.ibm.db2.jcc.t4.ac.a(Unknown Source)
at com.ibm.db2.jcc.t4.ac.<init>(Unknown Source)
at com.ibm.db2.jcc.t4.a.b(Unknown Source)
at com.ibm.db2.jcc.t4.b.newAgent_(Unknown Source)
at com.ibm.db2.jcc.am.Connection.initConnection(Unknown Source)
at com.ibm.db2.jcc.am.Connection.<init>(Unknown Source)
at com.ibm.db2.jcc.t4.b.<init>(Unknown Source)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
at com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
at com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:64)
at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:349)
at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:55)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:72)
... 2 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.ibm.db2.jcc.t4.w.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 19 more
派对已经很晚了，但 Kiran Kumar 是对的，这是由防火墙问题引起的
尝试通过 mybatis 使用 eclipse 连接到 DB2 中的数据库 returns 我这个错误：
### Error opening session. Cause: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
可以使用 DB2 控制台访问数据库，我已经将 DB2COMM 设置为 TCPIP，但仍然不起作用
test.java
public class Test {
public static void main(String[] args){
Reader reader = null;
SqlSessionFactory sqlSessionFactory = null;
SqlSession session = null;
try {
reader = Resources.getResourceAsReader("mybatis-config.xml");
} catch (IOException e) {
System.out.println("MyBatis config not found!");
e.printStackTrace();
}
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
session = sqlSessionFactory.openSession();
User user = new User();
user.setName("second");
user.setNumber(2);
session.insert("User.addNew", user);
int num = session.selectOne("User.getNumber", "second");
System.out.println(num);
session.close();
}
}
mapper.xml
<mapper namespace="User">
<resultMap type="int" id="resultNumber">
<result property="number" column="NUMBER" />
</resultMap>
<resultMap type="User" id="resultUser">
<result property="name" column="NAME" />
<result property="number" column="NUMBER" />
</resultMap>
<select id="getNumber" parameterType="String" resultMap="resultNumber">
SELECT number
FROM mp.mybatis
WHERE name = #{name}
</select>
<select id="getUser" parameterType="String" resultMap="resultUser">
SELECT *
FROM mp.mybatis
WHERE name = #{name}
</select>
<insert id="addNew" parameterType="User">
INSERT INTO mp.mybatis (name, number)
VALUES (#{name}, #{number})
</insert>
<update id="updateUser" parameterType="map">
UPDATE mp.mybatis
SET name = #{new.name}, number = #{new.number}
WHERE name = #{old.name} AND number = #{old.number}
</update>
<delete id="deleteUser" parameterType="String">
DELETE FROM mp.mybatis
WHERE name = #{name}
</delete>
</mapper>
mybatis-config
<?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>
<properties resource='jdbc.properties' />
<typeAliases>
<typeAlias type='com.MyBatisMP.POJO.User' alias='User'></typeAlias>
</typeAliases>
<environments default='development'>
<environment id='development'>
<transactionManager type='JDBC' />
<dataSource type='POOLED'>
<property name='driver' value='${jdbc.driverClassName}' />
<property name='url' value='${jdbc.url}' />
<property name='username' value='${jdbc.username}' />
<property name='password' value='${jdbc.password}' />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource='com/MyBatisMP/Mapper/UserMapper.xml' />
</mappers>
</configuration>
jdbc.properties
jdbc.driverClassName=com.ibm.db2.jcc.DB2Driver
jdbc.url=jdbc:db2://localhost:50000/mp
jdbc.username=XXX
jdbc.password=XXX
数据库名为 "mp"，table 为 "mybatis"
完整的错误信息
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error opening session. Cause: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
### Cause: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:81)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:32)
at com.MyBatisMP.Test.Test.main(Test.java:27)
Caused by: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.19.49] Exception java.net.ConnectException: Error opening socket to server localhost/127.0.0.1 on port 50,000 with message: Connection refused: connect. ERRORCODE=-4499, SQLSTATE=08001
at com.ibm.db2.jcc.am.kd.a(Unknown Source)
at com.ibm.db2.jcc.am.kd.a(Unknown Source)
at com.ibm.db2.jcc.t4.ac.a(Unknown Source)
at com.ibm.db2.jcc.t4.ac.<init>(Unknown Source)
at com.ibm.db2.jcc.t4.a.b(Unknown Source)
at com.ibm.db2.jcc.t4.b.newAgent_(Unknown Source)
at com.ibm.db2.jcc.am.Connection.initConnection(Unknown Source)
at com.ibm.db2.jcc.am.Connection.<init>(Unknown Source)
at com.ibm.db2.jcc.t4.b.<init>(Unknown Source)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(Unknown Source)
at com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
at com.ibm.db2.jcc.DB2Driver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:64)
at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:349)
at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:55)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:72)
... 2 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.ibm.db2.jcc.t4.w.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 19 more
派对已经很晚了，但 Kiran Kumar 是对的，这是由防火墙问题引起的