mysql5.x忘记密码

半导体 — Sat, 17 Feb 2024 07:09:00 GMT

参考：https://blog.csdn.net/qq_34102150/article/details/126120056

1、停止MySQL服务，输入 net stop mysql 停止服务。

2、切换到MySQL的bin文件下，

mysql5.x： mysqld --console --skip-grant-tables --shared-memory

mysqld --console --skip-grant-tables --shared-memory

3、输入mysql -uroot -p回车，不用输入密码，直接按回车跳过，

输入： use mysql

输入： update user set password=PASSWORD('123456') where USER='root';
或者： GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'IDENTIFIED BY '123456' WITH GRANT OPTION;
输入： FLUSH PRIVILEGES;

4、重启服务

半导体 2024-02-17 15:09 发表评论

微信小程序开发流程

半导体 — Sat, 08 Aug 2020 02:11:00 GMT

准备工作：
需要https的域名
1、域名申请、备案（我是在阿里云买的服务器，域名也在阿里云购买）
2、域名与IP绑定
3、ssl安全证书申请（https）
4、下载ssl安全证书布署在tomcat服务器
4、在云服务器tomcat中布署https

参考 https://blog.csdn.net/qq_35206244/article/details/97613498

ps:任何操作不会，直接打阿里云客服电话 95187

小程序开发流程：
1、在微信官网注册帐号
2、下载小程序开发工具
3、小程序开发、上传
4、小程序送审，审核通过即可分享给你的朋友

半导体 2020-08-08 10:11 发表评论

mall 工程创建踩坑

半导体 — Mon, 20 Jul 2020 13:52:00 GMT

新建项目坑

www.macrozheng.com项目，打开maven总是引入失败，后来

https://www.cnblogs.com/dk1024/p/10778841.html

https://blog.csdn.net/ken_ding/article/details/85623092这个是前端有可能遇见的坑的解决办法

安装环境文档：

http://www.macrozheng.com/#/deploy/mall_deploy_windows

半导体 2020-07-20 21:52 发表评论

springboot 打包后，在dos命令行运行提示没有主清单属性的解决办法

半导体 — Sat, 27 Jun 2020 08:42:00 GMT

1.在pom.xml文件中插入

            org.springframework.boot
            spring-boot-maven-plugin

2.双击IDEA右侧Maven Projects的lifecycle下的package，打包成jar，重新执行以上命令。

半导体 2020-06-27 16:42 发表评论

MyBatis出现org.apache.ibatis.executor.ExecutorException异常

半导体 — Wed, 25 Mar 2020 12:01:00 GMT

DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection 29011566.
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@1baae6e]
DEBUG [main] - ==>  Preparing: select * from user where username like concat(?,'%')
DEBUG [main] - ==> Parameters: 张(String)

org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: org.apache.ibatis.executor.result.ResultMapException: Error attempting to get column 'username' from result set.  Cause: java.sql.SQLException: Cannot convert value 'å¼ ä¸' from column 2 to TIMESTAMP.
### The error may exist in sqlmap/User.xml
### The error may involve test.findUserByName3
### The error occurred while handling results
### SQL: select * from user where username like concat(?,'%')
### Cause: org.apache.ibatis.executor.result.ResultMapException: Error attempting to get column 'username' from result set.  Cause: java.sql.SQLException: Cannot convert value 'å¼ ä¸' from column 2 to TIMESTAMP.

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
    at com.swjd.test.B.test2(B.java:40)
    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.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    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$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$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: org.apache.ibatis.executor.result.ResultMapException: Error attempting to get column 'username' from result set.  Cause: java.sql.SQLException: Cannot convert value 'å¼ ä¸' from column 2 to TIMESTAMP.
    at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:83)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createUsingConstructor(DefaultResultSetHandler.java:671)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createByConstructorSignature(DefaultResultSetHandler.java:654)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:618)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:591)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:354)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:301)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:194)
    at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:65)
    at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
    at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
    at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
    at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
     24 more
Caused by: java.sql.SQLException: Cannot convert value 'å¼ ä¸' from column 2 to TIMESTAMP.
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
    at com.mysql.jdbc.ResultSetRow.getTimestampFast(ResultSetRow.java:1328)
    at com.mysql.jdbc.ByteArrayRow.getTimestampFast(ByteArrayRow.java:124)
    at com.mysql.jdbc.ResultSetImpl.getTimestampInternal(ResultSetImpl.java:6669)
    at com.mysql.jdbc.ResultSetImpl.getTimestamp(ResultSetImpl.java:5988)
    at com.mysql.jdbc.ResultSetImpl.getTimestamp(ResultSetImpl.java:6026)
    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.ResultSetLogger.invoke(ResultSetLogger.java:69)
    at com.sun.proxy.$Proxy6.getTimestamp(Unknown Source)
    at org.apache.ibatis.type.DateTypeHandler.getNullableResult(DateTypeHandler.java:39)
    at org.apache.ibatis.type.DateTypeHandler.getNullableResult(DateTypeHandler.java:28)
    at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:81)
     41 more
Caused by: java.lang.NumberFormatException: 张三
    at com.mysql.jdbc.StringUtils.getInt(StringUtils.java:756)
    at com.mysql.jdbc.ResultSetRow.getTimestampFast(ResultSetRow.java:1253)
     54 more

Process finished with exit code -1

上网找了一些答案也没有解决我的问题，

后来发现原来是User类的构造函数问题，找不到相关的构造函数；试着在User中加一个默认的构造函数，就解决了。。。

希望能帮到大家。

默认的构造函数在创建构造函数后，不会自动创建默认构造函数

DEBUG [main] - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection 27155935.
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@19e5ddf]
DEBUG [main] - ==>  Preparing: select * from user where id=?
DEBUG [main] - ==> Parameters: 27(Integer)

org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.swjd.po.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.swjd.po.User.<init>()
### The error may exist in sqlmap/User.xml
### The error may involve test.findUserById-Inline
### The error occurred while setting parameters
### SQL: select * from user where id=?
### Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.swjd.po.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.swjd.po.User.<init>()

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:111)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66)
    at com.test.Test1.test1(Test1.java:31)
    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.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    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$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$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: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.swjd.po.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.swjd.po.User.<init>()
    at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:86)
    at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:48)
    at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:41)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:528)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:507)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:331)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:291)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:266)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:236)
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:150)
    at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:60)
    at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)
    at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)
    at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
    at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
     25 more
Caused by: java.lang.NoSuchMethodException: com.swjd.po.User.<init>()
    at java.lang.Class.getConstructor0(Class.java:3082)
    at java.lang.Class.getDeclaredConstructor(Class.java:2178)
    at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:60)
     42 more

Process finished with exit code -1

这种错也是同样的问题，

加上无参构造函数就可以了。

当创建对象来接受sql结果时会遍历实体类的构造方法找到与之匹配的，如果实体类中有构造方法了但是参数不匹配的话就会报上述错误，此时添加无参构造方法（默认的构造方法），会走其他方法，

https://blog.csdn.net/qq_35975416/article/details/80488267

半导体 2020-03-25 20:01 发表评论

idea jsp代码不提示Java代码

半导体 — Sun, 08 Mar 2020 12:11:00 GMT

在里写java代码有提示，在里不写%>就有提示。

这是由于按提示快捷键alt+enter导致。解决方法一直未找到合适的。
解决方法：

半导体 2020-03-08 20:11 发表评论

项目管理推荐好文

半导体 — Sun, 08 Mar 2020 03:41:00 GMT

挣值管理（PV、EV、AC、SV、CV、SPI、CPI）记忆之我见 http://www.cnitpm.com/pm/7707.html https://blog.csdn.net/weixin_38197294/article/details/79852129

半导体 2020-03-08 11:41 发表评论

jquery传参及获取方式

半导体 — Sat, 08 Feb 2020 10:36:00 GMT

html写法

<form id="myform">
<input type="radio" value="1" name="gender">男
<input type="radio" value="2"  name="gender">女
<input type="text" name="username" />
<input type="button" value="提交" onclick="fun()"/>
form>
<div id="myText">div>

获取值方式一

"+data;
               },"text")
        }
    script>

获取值方式二：

var gender = $ ("input [name= 'gender' ] : checked") .val() ;

半导体 2020-02-08 18:36 发表评论

spring boot结合thymeleaf通过后台传入的数值循环生成标签

半导体 — Wed, 16 Oct 2019 08:06:00 GMT

spring boot结合thymeleaf通过后台传入的数值循环生成标签

半导体 2019-10-16 16:06 发表评论

模态框传值

半导体 — Sat, 12 Oct 2019 08:35:00 GMT

模态框传值：

https://blog.csdn.net/linhaiyun_ytdx/article/details/77417702

半导体 2019-10-12 16:35 发表评论

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