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com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections
最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式:打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...
开发笔记
·
2024-04-29
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException
Data
source
rejected
establishment
c# winform 开启双缓冲,解决dataguidview卡顿
窗体的构造函数中,开启窗体的双缓冲publicssss(){//设置窗体的双缓冲this.SetStyle(ControlStyles.OptimizedDoubleBuffer|ControlStyles.ResizeRedraw|ControlStyles.AllPaintingInWmPaint,true);th...
开发笔记
·
2024-02-02
winform
开启
缓冲
解决
dataguidview
dataGridView双缓冲双buffer代码
在form_load方法中添加一下代码 双缓冲:Typetype=dataGridView_items.GetType();System.Reflection.PropertyInfopi=type.GetProperty("DoubleBuffered",System.Reflection.BindingF...
开发笔记
·
2024-02-02
dataGridView
缓冲
buffer
代码
dataset导入导出xml
dataset导入xml DataSetdt=BLL.TestClass.Getusers();dt.WriteXml("d:/xml.xml",XmlWriteMode.WriteSchema);xml导入dataset DataSetdsNew=newDataSet();ds...
开发笔记
·
2024-02-01
dataset
导入
导出
xml
C#从数据库读取数据到DataSet并保存到xml文件的方法
DataSet有一个WriteXml方法可以直接将数据保存到xml文件usingSystem;usingSystem.Data;usingSystem.Xml;usingSystem.Data.SqlClient;usingSystem.IO;publicclassTestWriteXML{publicstaticvo...
开发笔记
·
2023-12-25
数据库
读取
数据
DataSet
保存
datax中sqlserver 数据同步到sqlserver
{"job":{"setting":{"speed":{"channel":5}},"content":[{"reader":{"name":"sqlserverreader","parameter":{"username":"xx","password":"xx","where":"","connection":[{...
开发笔记
·
2023-09-14
sqlserver
datax
数据
同步
ORA-53213: cannot access DICOM data with invalid source type
文档解释ORA-53213:cannotaccessDICOMdatawithinvalidsourcetypeCause:AninvalidsourcetypewasstoredinthesourceattributeoftheORDDicomobject.Action:SeetheOracleMultimediad...
IT技术学习
·
2023-07-28
ORA-53213
cannot
access
DICOM
data
ORA-39202: Data cannot be filtered or selected in string jobs.
文档解释ORA-39202:Datacannotbefilteredorselectedinstringjobs.Cause:Adatafilterwassuppliedforthespecifiedtypeofjob,butisnotsupportedinthespecifiedjobtype.Fromthecomm...
IT技术学习
·
2023-07-28
ORA-39202
Data
cannot
be
filtered
ORA-38734: Flashback log is inconsistent; belongs to another database.
文档解释ORA-38734:Flashbacklogisinconsistent;belongstoanotherdatabase.Cause:ThedatabaseIDintheflashbackdatabaselogfiledidnotmatchthedatabaseIDinthecontrolfile.Actio...
IT技术学习
·
2023-07-28
ORA-38734
Flashback
log
is
inconsistent
ORA-39033: Data cannot be filtered under the direct path access method.
文档解释ORA-39033:Datacannotbefilteredunderthedirectpathaccessmethod.Cause:Theuserspecifiedthatthedataaccessmethodforthejobwasdirectwhichprecludestheuseofcertaindat...
IT技术学习
·
2023-07-28
ORA-39033
Data
cannot
be
filtered
ORA-29307: datafile string error, string
文档解释ORA-29307:datafilestringerror,stringCause:Thedatafileisnotreadyfortablespacepoint-in-timerecovery.Action:Checkthecorrecttablespacepoint-in-timerecoveryproce...
IT技术学习
·
2023-07-28
string
ORA-29307
datafile
error
ORA-28045: SSL authentication between database and OID failed
文档解释ORA-28045:SSLauthenticationbetweendatabaseandOIDfailedCause:ServerfailedtoauthenticateitselftotheDirectory.Action:Makesurethesqlnet.orausedispointingtothewa...
IT技术学习
·
2023-07-28
ORA-28045
SSL
authentication
between
database
ORA-29895: duplicate base datatype specified
文档解释ORA-29895:duplicatebasedatatypespecifiedCause:UserattemptedtoaddabasedatatypetoanindextypewithARRAYDMLwhichisalreadysupportedbytheindextypeAction:Removethed...
IT技术学习
·
2023-07-28
ORA-29895
duplicate
base
datatype
specified
ORA-38724: Invalid option to the FLASHBACK DATABASE command.
文档解释ORA-38724:InvalidoptiontotheFLASHBACKDATABASEcommand.Cause:AninvalidoptionwasspecifiedtotheFLASHBACKDATABASEcommand.Validoptionsare:SCNorTIMESTAMP.Action:Co...
IT技术学习
·
2023-07-28
ORA-38724
Invalid
option
to
the
ORA-24240: invalid database access descriptor (DAD) name
文档解释ORA-24240:invaliddatabaseaccessdescriptor(DAD)nameCause:ThespecifiedDatabaseAccessDescriptor(DAD)namewasinvalid.Action:MakesurethenameoftheDatabaseAccessDes...
IT技术学习
·
2023-07-28
ORA-24240
invalid
database
access
descriptor
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