I have to search for a Postcode in my XML type column. I have created a primary XML index on my table.
I am following this article to understand the concepts.
My query looks like this
select *some fields* from table_name where
[xml_column].exist(''/Session/Entries/Entry[#DataItemId="Address.Postcode" and contains(upper-case(.), "#Postcode")]'') = 1
#Postcode is the input parameter and user can enter full or partial postcode
Now according to the link,
If your workload uses path expressions significantly on XML columns, the PATH secondary XML index is likely to speed up your workload. The most common case is the use of the exist() method on XML columns in the WHERE clause of Transact-SQL.
But then I get little confused with the following statement
If your workload retrieves multiple values from individual XML
instances by using path expressions, clustering paths within each XML
instance in the PROPERTY index may be helpful. This scenario typically
occurs in a property bag scenario when properties of an object are
fetched and its primary key value is known.
I am using exist() method in my where clause but I am returning multiple records.
I am confused as to which secondary index should I create as per my query. I am inclining more towards the PROPERTY index.
Can I create all 3 and let SQL handle which one to choose ?? Will this increase the size of the node table and hamper the speed of the database ??
Part of my XML looks like this
<Session>
<Entries>
<Entry DataItemId="AccountNumber" Type="Pattern" Source="SessionStore">
<Value>212312311</Value>
</Entry>
<Entry DataItemId="SortCode" Type="Pattern" Source="SessionStore">
<Value>10-20-30</Value>
</Entry>
<Entry DataItemId="AccountName" Type="Free" Source="SessionStore">
<Value>XXXXXXXXX</Value>
</Entry>
<Entry DataItemId="Let" Type="Set" Source="SessionStore">
<Value>LET</Value>
</Entry>
<Entry DataItemId="Relative" Type="Boolean" Source="SessionStore">
<Value>False</Value>
</Entry>
<Entry DataItemId="LtdCompany" Type="Boolean" Source="SessionStore">
<Value>False</Value>
</Entry>
<Entry DataItemId="Address.Postcode" Type="Pattern" Source="SessionStore">
<Value>GL8 1TT</Value>
</Entry>
<Entry DataItemId="Address.Line1" Type="Free" Source="SessionStore">
<Value>Askdaskdaoiksd</Value>
</Entry>
<Entry DataItemId="Address.Line2" Type="Free" Source="SessionStore">
<Value>Ojasuiodjaisjdsa</Value>
</Entry>
<Entry DataItemId="PropertyType" Type="Set" Source="SessionStore">
<Value>DH</Value>
</Entry>
<Entry DataItemId="Tenure" Type="Set" Source="SessionStore">
<Value>1</Value>
</Entry>
<Entry DataItemId="BuiltThisYear" Type="Boolean" Source="SessionStore">
<Value>False</Value>
</Entry>
<Entry DataItemId="YearBuilt" Type="Integer" Source="SessionStore">
<Value>1960</Value>
</Entry>
<Entry DataItemId="StdConstruction" Type="Boolean" Source="SessionStore">
</Entries>
</Session>
UPDATE
I did some more digging and then had a chat with senior DBA friend of mine and who advised me to created a PATH index. The query seems to be working way quicker than before.
Related
This is my xml configuration:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="DB2SAMPLE" defaultModelType="flat" targetRuntime="MyBatis3">
<plugin type="org.mybatis.generator.plugins.RenameExampleClassPlugin">
<property name="searchString" value="Example$"/>
<property name="replaceString" value="Criteria"/>
</plugin>
<plugin type="org.mybatis.generator.plugins.CaseInsensitiveLikePlugin" />
<plugin type="org.mybatis.generator.plugins.RowBoundsPlugin" />
<commentGenerator>
<property name="suppressAllComments" value="true" />
</commentGenerator>
<jdbcConnection driverClass="com.ibm.db2.jcc.DB2Driver" connectionURL="jdbc:db2://LOCALHOST:50000/mydb" userId="username" password="password">
</jdbcConnection>
<javaModelGenerator targetPackage="foo.package" targetProject="src/main/java">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="false" />
</javaModelGenerator>
<sqlMapGenerator targetPackage="foo.package" targetProject="src/main/resources">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER" targetPackage="foo.package" targetProject="src/main/java">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<table schema="SCHEMA" tableName="MyTable" alias="MYTABLE" domainObjectName="MYTABLE"/>
</context>
</generatorConfiguration>
The problem is that it not found the table MyTable because it search MYTABLE.
How can I setup MyBatis generator for searching case sensitive name MyTable?
Thanks.
From https://www.codeday.top/2016/12/22/6853.html
1， If schema，catalog or tablename There are spaces in ， So what format is set ， On the exact use of the specified format to query ；
2， otherwise ， If the database identifier uses uppercase ， that MBG Automatically turn table name into uppercase search ；
3， otherwise ， If the database identifier uses lowercase ， that MBG Automatically turn table name to lowercase search ；
4， otherwise ， Query using the specified case format ；
Additional ， If the table is created ， Using "" Specify database object size ， Even if the database identifier is used ， In this case a table name is created using a given case size ；
At this time ， Please set delimitIdentifiers="true" Case preserving format ；
How to know write count of each item writer of composite item writer?
Here is my composite item writer
<bean id="Writer" class="org.springframework.batch.item.support.ClassifierCompositeItemWriter" scope="step">
<property name="classifier">
<bean class="org.springframework.batch.classify.BackToBackPatternClassifier">
<property name="routerDelegate"><bean class="com.classifier.RecordKeeperClassifier" scope="prototype" />
</property>
<property name="matcherMap">
<map>
<entry key="abc" value-ref="ItemWriter1" />
<entry key="xyz" value-ref="ItemWriter2" />
<entry key="*" value-ref="errorItemWriter" />
</map>
</property>
</bean>
</property>
</bean>
How to know no records with "abc" field as a key in the input file . I used footercallback listener and stepExecution.getWriteCount() method to know the writeCount , it is giving total count of inputs records I need only input records count with "abc" field
The total count of written items is cumulative so you have to count item manually using a ItemWriteListener if you are using a built-in writer or - optionally - overriding ItemWriter.write() for a custom writer
I am using EF in .NET V4.0 in Visual Basic (VS2010) with SQL Compact Edition 4.0. We are building a set of simple forms to maintain some tables. One table 'Companies' is linked to 2 other tables (People,CalibrationInfo) with Companies as the parent table. The Entity Type Definition is:
<EntityType Name="Company">
<Documentation>
<Summary>Provides a list of Companies and shipping addresses.</Summary>
</Documentation>
<Key>
<PropertyRef Name="CompanyID" />
</Key>
<Property Name="CompanyID" Type="Int32" Nullable="false" annotation:StoreGeneratedPattern="Identity" />
<Property Name="Name" Type="String" MaxLength="100" Unicode="true" FixedLength="false" Nullable="false" />
<Property Name="Address1" Type="String" MaxLength="100" Unicode="true" FixedLength="false" />
<Property Name="Address2" Type="String" MaxLength="100" Unicode="true" FixedLength="false" />
<Property Name="Address3" Type="String" MaxLength="100" Unicode="true" FixedLength="false" />
<Property Name="Telephone" Type="String" MaxLength="30" FixedLength="false" Unicode="true" />
<Property Name="PrimaryContactID" Type="Int32" a:GetterAccess="Public" xmlns:a="http://schemas.microsoft.com/ado/2006/04/codegeneration" a:SetterAccess="Public" Nullable="true" >
<Documentation>
<Summary>Optional Primary Contact ID for the primary contact for this company.</Summary>
</Documentation>
</Property>
<Property Name="Disabled" Type="Boolean" Nullable="false" DefaultValue="false" />
<NavigationProperty Name="Calibrations" Relationship="NWCUDataStoreModel.FK_CalibrationInfo_Company" FromRole="Companies" ToRole="CalibrationInfo" />
<NavigationProperty Name="PrimaryContact" Relationship="NWCUDataStoreModel.FK_Company_PrimaryContact" FromRole="Company" ToRole="Person" />
</EntityType>
The form uses a binding source set to the Company set in the context:
bsCompanies = ctx.Companies.OrderBy("it.Name")
The Binding Source is linked to a Navigation Bar. Pressing the BindingNavigatorAddNewItem button gets a new record created. I enter only the company name tab to the next field and press the Save button. The link to the Primary Contact is set to nothing so there are no other relationships for this record. The Save button executes the following:
RowsSaved = ctx.SaveChanges()
This generates the InvalidOperationException. The Inner exception is:
AcceptChanges cannot continue because the object's key values conflict with another object...
There are no other records in the database with the name set to 'Test'. The exception indicates that the record was saved, but was unable to accept the changes. The record is still marked as Added. Calling ctx.AcceptChanges after this error generates an exception.
If I were doing this directly in code, instead of with BindingSource on a form, it would essentially look like this:
dim company as New Company
company.Name="Test"
company.PrimaryContactID = nothing
ctx.Companies.Add(company)
ctx.Save
I have looked at other examples of this on multipe sites, and have applied any fixes I could find, including setting the PrimaryContact id directly to a the correct Person record ID and setting the PrimaryContact to Nothing. Nothing makes any difference.
I have also deleted the three tables from the model and then reloaded them. No difference.
I have used this same code with no problems in SQL Server, but almost nothing seems to work with SQL Compact edition V4.0. You would think it should not be so difficult to store a single record into a table. If we have to go back to data sets, I have a lot of recoding to do.
Any suggestions or insights appreciated.
Thanks, Neil
BTW, the answer to this was to use Nuget to download Entity Framework 6.0, Entity Framework SQL Server Compact and Microsoft SQL Server Compact 4.0. I then downloaded the EF Framework 5 DB Generator .tt file as the EF 6 version does not work in Visual Studio 2010. You do this from the Add Code Generation menu item, and select Online Templates->EF 5 DBContext Generator... Finally, I modified the file using this Microsoft article: Databinding with WinForms. After that, things started to work. EF 4.0 does not work with SQL Server Compact, out of the box, without the changes described above. Using the ObservableListSource class described in the article also helped with parent-child relationships on forms, which did not work until I switched to this class.
Although I've developed some services with Liferay ServiceBuilder, I'm not quite sure I understand the point of using the attributes:
userId
companyId
groupId
Note that these attributes are available through the PortalRequest.
Following the basic tutorials, you are instructed to create these attributes for every entity, and take care to set them on 'add' functions. But thinking of it, I've not ever seen any tutorial or referenced code where these attributes are used on data retrieval (Finder methods, dynamic queries, or custom queries either)
So what's the point on keeping this information ?
Are these attributes used automatically somehow under some convention or scope ? Something like, the Liferay's default Finders using them when they are available through the PortalRequest ?
Or is it up to the developer to use them on every Select, E.g. are all the single-parameter Finders practically useless on multi-instance Portals (since the companyId attribute should be used on every Finder method) ?
Or is it just a good practice to keep this structure for database extendability, auditing, indexing or something else I'm totally missing ?
These attributes are necessary when you use your entities for example on staging environment. The groupId specifies to which environment the entity belongs to. Meaning of userId is obvious and as for companyId it is the site identifier. So IMHO these attributes are quite important when you have multiple sites on one portal, when you have staging env. enabled etc..
Suppose you have a new table and you want to set UserId in your table then it is necessary but otherwise I don't think these attributes are neccessary.
I have created service builder
<entity name="FaoEsalesCustomer" local-service="true" remote-service="false" table="fao_esalecustomer">
<!-- PK fields -->
<column name="esaleCustomerId" type="long" primary="true" />
<!-- Audit fields -->
<column name="createdBy" type="long" />
<column name="createdOn" type="Date" />
<column name="modifiedBy" type="long" />
<column name="modifiedOn" type="Date" />
<!-- Other fields -->
<column name="customerName" type="String" />
<column name="address" type="String" />
<column name="ph" type="Integer" />
<column name="categoryId" type="long" />
<column name="categoryName" type="String" />
<column name="quantity" type="Double" />
<column name="price" type="Double" />
</entity>
<routes>
<www type="Zend_Controller_Router_Route_Hostname">
<route>www.domain.com</route>
<chains>
<index type="Zend_Controller_Router_Route">
<route></route>
<defaults module="default" controller="index" action="index" />
</index>
<community>
<route>community</route>
<defaults module="community" />
<chains>
<index type="Zend_Controller_Router_Route">
<route>:action/*</route>
<defaults controller="index" action="index" />
</index>
<member type="Zend_Controller_Router_Route_Regex">
<route>member/profile-(\d+)-(.+)</route>
<reverse>member/profile-%d-%s</reverse>
<map>
<id>1</id>
<nom>2</nom>
</map>
<defaults action="viewmember" />
</member>
</chains>
</community>
</chains>
</www>
As you can see, I use a route with :action/* in to cover the homepages and the basics actions on index controller.
domain.com/community/random_action => works good.
domain.com/community/ doesn't work. The whole homepage is displayed.
I checked, and the default route is matched.
I tried assemble() on route "www-community-index" and it gives well www.domain.com/community
I don't see from where comes the problem :(
The first thing you should check is if you deleted the default route.
The second one is....remember that the routes are checked in reverse order. This means that the most specific should be the first and the default the last one.