在INSERT语句中放入AUTO_INCREMENT时，mybatis无效

问题描述 投票：0回答：1

就像下面的代码一样，它在Navicate中运行良好，但是我把它放在mybatis中，它不起作用，似乎无法获得价值。

    INSERT INTO `table_user`(
        `account`,
        `createtime`,
        `path`
    )
    VALUES
    (
    'test',
    now(),
    CONCAT(
        'test-',
        (
            SELECT
                AUTO_INCREMENT
            FROM
                information_schema. TABLES
            WHERE
                TABLE_SCHEMA = DATABASE ()
            AND TABLE_NAME = 'user_info'
        )
    )
)

mybatis： INSERT INTO ( account, createtime, path ) VALUES ( #{account}, now(), CONCAT('test-',(SELECT AUTO_INCREMENT FROM information_schema.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='user_info')) )

我有例外：

### Error updating database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'path' cannot be null
### The error may involve bestyyt.dao.UserInfoDao.save-Inline
### The error occurred while setting parameters
### SQL: INSERT INTO                table_user               (         account, createtime, path         ) VALUES (         ?, now(), CONCAT('test-',(SELECT AUTO_INCREMENT FROM information_schema.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='table_user'))         )
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'path' cannot be null
; SQL []; Column 'path' cannot be null; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'path' cannot be null

    at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:85)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)
    at com.sun.proxy.$Proxy26.insert(Unknown Source)
    at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:279)
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:56)
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
    at com.sun.proxy.$Proxy27.save(Unknown Source)
    at bestyyt.dao.UserInfoDaoTest.save(UserInfoDaoTest.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    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.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:252)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    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$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'path' cannot be null
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
    at com.mysql.jdbc.Util.getInstance(Util.java:387)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:934)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2526)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
    at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192)
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:198)
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:198)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59)
    at com.sun.proxy.$Proxy29.execute(Unknown Source)
    at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:46)
    at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74)
    at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50)
    at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
    at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:434)
    ... 34 more
mysql mybatis
1个回答
0
投票

这里简短的回答是在查询中硬编码您的数据库名称而不是使用DATABASE（）。版本较长......

正如在注释中已经确定的那样，问题的直接原因是查询返回的NULL。如果它的任何部分为NULL，则CONCAT（）函数将返回NULL，您可以使用它来解决

CONCAT_WS（''，'test - '，（选择其余的查询））

这将始终保证path包含字符串'test-'，因此您不会失败列上的NOT NULL约束（但您有无意义的数据）。

由于您已确认user_info表的存在，因此查询失败的可能性很小

TABLE_SCHEMA=DATABASE()

它试图选择默认（当前）数据库。如果没有默认值则返回NULL（因此CONCAT失败）。要使DATABASE（）返回一个值，您需要使用USE语句显式设置它（或者您的客户端执行此操作）。我在工作台上尝试了这个，但它可能适用于navicat，例如

-- make sure you have no database selected
CREATE DATABASE foo;
USE foo;
DROP DATABASE foo;

-- create the test table
CREATE DATABASE test IF NOT EXISTS;
DROP TABLE IF EXISTS test.auto_inc;
CREATE TABLE test.auto_inc (
  `id` INT AUTO_INCREMENT NOT NULL PRIMARY KEY,
  `path` varchar(20) NOT NULL );

-- without a default using database()
SELECT 'With DB()',`AUTO_INCREMENT`
FROM information_schema.TABLES 
WHERE TABLE_SCHEMA = DATABASE()
AND TABLE_NAME = 'auto_inc'; 
Empty set (0.00 sec)

USE test;

-- with explicit USE statement
SELECT 'DB()',`AUTO_INCREMENT` 
FROM information_schema.TABLES 
WHERE TABLE_SCHEMA = DATABASE()
AND TABLE_NAME = 'auto_inc'; 
+------+----------------+
| DB() | AUTO_INCREMENT |
+------+----------------+
| DB() |              1 |
+------+----------------+
1 row in set (0.02 sec)

我在您的示例中看不到显式设置数据库的任何内容。据推测，您在连接字符串中指定了一个数据库，但这似乎不够。您可以通过简单的方法从应用程序中测试它

SELECT DATABASE();

如果您对数据库名称进行硬编码，就像执行表名一样，它将在不需要USE语句的情况下工作。

最后，由于此表具有AUTO_INCREMENT列，并且您创建的记录具有该值，为什么要单独将其写入记录？

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