我的问题与以下问题Mapping postgreSQL JSON column to Hibernate value type有关，虽然当我在postgres中测试将字符串传递给psql时，答案是有效的，但是当我从Java代码传递字符串时它不起作用。
我正在使用MyBatis通过Spring注入将sql映射到postgres数据库。
这是我的MyBatis Java接口，我遇到问题的方法是映射到Postgres JSON列的是updateState（）方法。
package receiver.spoke;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import receiver.bean.Spoke;
public interface SpokeDAOMyBatis extends SpokeDAO {
void updateState(@Param("id") long spokeId, @Param("state") String state);
String getState(@Param("id") long spokeId);
List<Spoke> getSpokes();
// The close() method must exist.
void close();
}
以下是我的mapper类：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="receiver.spoke.SpokeDAOMyBatis">
<update id="updateState">
UPDATE
spokes
SET
state = #{state}
WHERE
id = #{id}
</update>
<select id="getState" resultType="java.lang.String"
parameterType="long" useCache="false">
SELECT
state
FROM
spokes
WHERE
id = #{id}
</select>
<select id="getSpokes" resultMap="Spoke" useCache="false">
SELECT
id,
description,
uri,
updatets
FROM
spokes
</select>
<resultMap type="receiver.bean.Spoke" id="Spoke">
<id property="id" column="id"/>
<id property="description" column="description"/>
<id property="uri" column="uri"/>
<id property="updatets" column="updatets"/>
</resultMap>
</mapper>
以下是Spoke bean类：
package receiver.bean;
import java.sql.Timestamp;
public class Spoke {
private long id;
private String description;
private String uri;
private Timestamp updatets;
// private String state;
public long getId() {
return this.id;
}
public void setId(long id) {
this.id = id;
}
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
public String getUri() {
return this.uri;
}
public void setUri(String uri) {
this.uri = uri;
}
public Timestamp getUpdatets() {
return updatets;
}
public void setUpdatets(Timestamp updatets) {
this.updatets = updatets;
}
// public String getState() {
// return (String) state;
// }
// public void setState(String state) {
// this.state = state;
// }
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((this.description == null) ? 0 : this.description.hashCode());
result = prime * result + (int) (this.id ^ (this.id >>> 32));
result = prime * result + ((this.uri == null) ? 0 : this.uri.hashCode());
result = prime * result + ((this.updatets == null) ? 0 : this.updatets.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Spoke other = (Spoke) obj;
if (this.description == null) {
if (other.description != null)
return false;
} else if (!this.description.equals(other.description))
return false;
if (this.id != other.id)
return false;
if (this.uri == null) {
if (other.uri != null)
return false;
} else if (!this.uri.equals(other.uri))
return false;
if (this.updatets == null) {
if (other.updatets != null)
return false;
} else if (!this.updatets.equals(other.updatets))
return false;
return true;
}
@Override
public String toString() {
return "SpokeData [id=" + this.id + ", description=" + this.description + ", uri=" + this.uri + "]";
}
}
以下是我的applicationContext.xml文件的代码
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
default-lazy-init="false">
<bean id="configurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list merge="true">
<value>classpath:db.properties</value>
</list>
</property>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="org.postgresql.Driver" />
<property name="url" value="${test.db.url}" />
<property name="username" value="${test.db.username}" />
<property name="password" value="${test.db.password}" />
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis-config.xml" />
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="spokeDAOMyBatis" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="receiver.spoke.SpokeDAOMyBatis" />
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
</beans>
以下是db.properties文件
test.db.url=jdbc:postgresql://localhost:5432/lunar
test.db.username=lunar
test.db.password=lunar
以下是mybatis-config.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="cacheEnabled" value="false" />
<setting name="lazyLoadingEnabled" value="false" />
<setting name="defaultExecutorType" value="REUSE" />
<!-- <setting name="defaultStatementTimeout" value="20000" /> -->
<setting name="logImpl" value="LOG4J" />
</settings>
</configuration>
这是包含json字段
的辐条表CREATE TABLE spokes (
id BIGSERIAL NOT NULL,
insertts TIMESTAMPTZ NOT NULL,
updatets TIMESTAMPTZ NOT NULL,
rowversion BIGINT NOT NULL,
description TEXT NOT NULL,
uri TEXT NOT NULL,
state JSON
);
-- create primary key
ALTER TABLE spokes ADD CONSTRAINT pk_spokes PRIMARY KEY (id);
-- triggers
CREATE TRIGGER b_spokes_audit BEFORE INSERT OR UPDATE ON spokes FOR EACH ROW EXECUTE PROCEDURE trigger_function_aud$
-- grants
GRANT ALL ON TABLE spokes TO lunar;
接下来创建字符串到json转换的函数
CREATE OR REPLACE FUNCTION json_intext(text) RETURNS json AS $$
SELECT json_in($1::cstring);
$$ LANGUAGE SQL IMMUTABLE;
CREATE FUNCTION
创建演员
CREATE CAST (text AS json) WITH FUNCTION json_intext(text) AS IMPLICIT;
CREATE CAST
这在从我的psql中进行转换时有效，但不是从java方进行转换
以下是一些测试，显示函数和强制转换通过psql为一个名为xxx的表，以及无效的json不被接受的事实
PREPARE test(text) AS INSERT INTO xxx(id,state) VALUES (1,$1);
PREPARE
execute test('{}');
INSERT 0 1
select json_in('a');
ERROR: invalid input syntax for type json
DETAIL: Token "a" is invalid.
CONTEXT: JSON data, line 1: a
select json_in('a'::cstring);
ERROR: invalid input syntax for type json
DETAIL: Token "a" is invalid.
CONTEXT: JSON data, line 1: a
select json_in('{}');
json_in
---------
{}
(1 row)
select json_in('{');
ERROR: invalid input syntax for type json
DETAIL: The input string ended unexpectedly.
CONTEXT: JSON data, line 1: {
select json_in('{}');
json_in
---------
{}
(1 row)
以下是我的测试课程：
package receiver.spoke;
import static org.junit.Assert.*;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbcp.BasicDataSource;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import receiver.bean.Spoke;
import receiver.spoke.SpokeDAOMyBatis;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "/applicationContext.xml" })
public class SpokeDAOMyBatisTest {
@Autowired
@Qualifier("spokeDAOMyBatis")
private SpokeDAOMyBatis spokeDAOMyBatis;
@Autowired
@Qualifier("dataSource")
private BasicDataSource datasource;
@Before
public void connectionTest() throws SQLException {
datasource.getConnection();
}
@Test
public void updateState() {
assertNotNull(spokeDAOMyBatis);
spokeDAOMyBatis.updateState(1L, "{}");
assertTrue("Returned wrong state", spokeDAOMyBatis.getState(1L).equals("{}"));
}
@Test
public void getState() {
assertNotNull(spokeDAOMyBatis);
String str1 = spokeDAOMyBatis.getState(1L);
String str2 = spokeDAOMyBatis.getState(2L);
assertTrue("Returned wrong state", spokeDAOMyBatis.getState(1L).equals(str1));
assertTrue("Returned wrong state", spokeDAOMyBatis.getState(2L).equals(str2));
}
@Test
public void getAllSpokesTest() {
assertNotNull(spokeDAOMyBatis);
List<Spoke> list = spokeDAOMyBatis.getSpokes();
System.out.println(list.toString());
assertNotNull("List of spokes returned null", list);
assertTrue("List of spokes is empty", !list.isEmpty());
assertNotNull("Invalid spoke", list.get(0));
assertNotNull("id not loaded", list.get(0).getId());
assertNotNull("description not loaded", list.get(0).getDescription());
assertNotNull("uri not loaded", list.get(0).getUri());
assertNotNull("updatets not loaded", list.get(0).getUpdatets());
}
}
所以这一切似乎都运行正常，但是当我尝试运行Java端时，我得到了如下面的堆栈跟踪中所示的强制转换异常：
Tests run: 3, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.241 sec <<< FAILURE!
updateState(receiver.spoke.SpokeDAOMyBatisTest) Time elapsed: 0.035 sec <<< ERROR!
org.springframework.jdbc.BadSqlGrammarException:
### Error updating database. Cause: org.postgresql.util.PSQLException: ERROR: column "state" is of type json but expression is of type character varying
Hint: You will need to rewrite or cast the expression.
Position: 38
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: UPDATE spokes SET state = ? WHERE id = ?
### Cause: org.postgresql.util.PSQLException: ERROR: column "state" is of type json but expression is of type character varying
Hint: You will need to rewrite or cast the expression.
Position: 38
; bad SQL grammar []; nested exception is org.postgresql.util.PSQLException: ERROR: column "state" is of type json but expression is of type character varying
Hint: You will need to rewrite or cast the expression.
Position: 38
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:231)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:74)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:399)
at com.sun.proxy.$Proxy17.update(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.update(SqlSessionTemplate.java:269)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:55)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
at com.sun.proxy.$Proxy24.updateState(Unknown Source)
at receiver.spoke.SpokeDAOMyBatisTest.updateState(SpokeDAOMyBatisTest.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:254)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: org.postgresql.util.PSQLException: ERROR: column "state" is of type json but expression is of type character varying
Hint: You will need to rewrite or cast the expression.
Position: 38
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2270)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1998)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:570)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:420)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:413)
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:169)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59)
at com.sun.proxy.$Proxy23.execute(Unknown Source)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:45)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:73)
at org.apache.ibatis.executor.ReuseExecutor.doUpdate(ReuseExecutor.java:51)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:115)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:170)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:386)
... 42 more
3601 [Thread-0] INFO org.springframework.context.support.GenericApplicationContext - Closing org.springframework.context.support.GenericApplicationContext@4fcd19b3: startup date [Mon Jan 11 11:10:54 GMT 2016]; root of context hierarchy
答案 0 :(得分：4)
将stringtype = unspecified添加到我的jdbc连接字符串中https://stackoverflow.com/users/1499698/pozs建议工作：
jdbc:postgresql://localhost:5432/dbname?stringtype=unspecified
这样做我也可以删除函数并从字符串转换为json。
我还通过将无效的json传递给JSON列来测试更改。
正如所希望的那样，我得到了一个DataIntegrityViolationException，正如我期望的那样测试
答案 1 :(得分：2)
为了通过Mybatis将JSON映射到Postgresql或从Postgresql映射JSON，你应该有适当的类型处理程序。
令人惊讶的是，我在这里有一个this
添加最新版本的工件后，您应该为代码添加适当的处理程序
nodemon在此之后，您将能够通过TreeNode接口或JsonNodeValue包装类使用JSON。
只有一件事你不应该在选择/插入JSON期间通过JDBC驱动程序作为字符串传递。当你需要插入东西时，这是至关重要的。