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  • Repeat use of Schema / Rich Snippets Markup i.e LocalBusiness Data

    - by bybe
    I am unable to find official wording and I'm hoping that some Rich Snippets/Schema Guru can give me some insight into proper usage of repeated content when it comes to using markup. I'm building a site that wants to use Schema as the markup type and the owner would like as much usage as possible. The business name, telephone and address will appear on every page now is it valid or even useful to use Rich Snippets on every page where this information is displayed. For example this information appears in the header, and footer of every page of the site and too give you an example of my current markup see below: <body itemscope itemtype="http://schema.org/LocalBusiness"> <header> <a itemprop="url" href="http://www.domain.co.uk/"> <img itemprop="logo" src="image.png" alt="Company Name Logo" /> </a> <span itemprop="telephone">01202 000 000</span> </header> <div> This is where the content will go</div> <footer> <span itemprop="name">Company Name</span> <span itemprop="description"> A small little bit about this company</span> <div itemprop="address" itemscope itemtype="http://schema.org/PostalAddress"> <span itemprop="streetAddress">Address Goes here</span> <span itemprop="addressLocality">Area Here</span>, <span itemprop="addressRegion">Region Here</span> </div> </footer> </body> !-- Local Business Schema Now Closed --> So as you can see above this information will be displayed on every single page.... Is this valid or bad to repeat usage of this information in schema format...

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  • BizTalk Schema Validation

    - by Christopher House
    Perhaps this one should be filed under:  Obvious Yesterday I created a new schema that is going to be used for a WCF receive.  The schema has a bunch of restrictions in it, with the intention that we'd validate incoming messages against the schema.  I'd never done message validation with BizTalk but I knew the XmlDisassembler component had an option for validating, so I figured it would be a piece of cake.  Sadly, that was not to be the case.  I deployed my artifacts and configured my receive location's XmlDisassembler with what I thought to be the correct document spec name.  I entered My.Project.Name.SchemaTypeName for the document spec and started running unit tests.  All of them failed with the following error logged in the event log: "WcfReceivePort_BizTalkWcfService/PurchaseOrderService" URI: "/BizTalkWcfService/PurchaseOrderService.svc" Reason: No Disassemble stage components can recognize the data. I went to the receive port and turned on tracking, submitted another message, then went to the admin console and saved the message.  It looked correct, but just to be sure, I manually validated it against the schema in my project.  As expected, it validated correctly. After a bit of thinking on this, I realized that I probably needed to fully qualify my document spec name, meaning, include the assembly name, as well as the type name.  So, I went back to the receive location and changed the document spec to: My.Project.Name.SchemaTypeName, My.Project.Name,Version=1.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxx I re-ran my unit tests and everything was working as expected.  So, note to self:  remember to include the assembly name when setting the document spec.  If you need an easy way to determine your schema name and assembly name, find your schema in the admin console and go to it's properties.  On the property screen, look at the Name and Assembly properties.  Your document spec will be "SchemaName, AssemblyName"

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  • Is this a ridiculous way to structure a DB schema, or am I completely missing something?

    - by Jim
    I have done a fair bit of work with relational databases, and think I understand the basic concepts of good schema design pretty well. I recently was tasked with taking over a project where the DB was designed by a highly-paid consultant. Please let me know if my gut intinct - "WTF??!?" - is warranted, or is this guy such a genius that he's operating out of my realm? DB in question is an in-house app used to enter requests from employees. Just looking at a small section of it, you have information on the users, and information on the request being made. I would design this like so: User table: UserID (primary Key, indexed, no dupes) FirstName LastName Department Request table RequestID (primary Key, indexed, no dupes) <...> various data fields containing request details UserID -- foreign key associated with User table Simple, right? Consultant designed it like this (with sample data): UsersTable UserID FirstName LastName 234 John Doe 516 Jane Doe 123 Foo Bar DepartmentsTable DepartmentID Name 1 Sales 2 HR 3 IT UserDepartmentTable UserDepartmentID UserID Department 1 234 2 2 516 2 3 123 1 RequestTable RequestID UserID <...> 1 516 blah 2 516 blah 3 234 blah The entire database is constructed like this, with every piece of data encapsulated in its own table, with numeric IDs linking everything together. Apparently the consultant had read about OLAP and wanted the 'speed of integer lookups' He also has a large number of stored procedures to cross reference all of these tables. Is this valid design for a small to mid-sized SQL DB? Thanks for comments/answers...

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  • validating an XML schema with empty attributes

    - by AdRock
    I am having trouble validating my xml schema. I get these errors on the schema 113: 18 s4s-elt-invalid-content.1: The content of '#AnonType_user' is invalid. 164: 17 s4s-elt-invalid-content.1: The content of '#AnonType_festival' is invalid. Element 'sequence' is invalid, misplaced, or occurs too often. and becuase of those 2 errors, i am getting loads of the same error. This is becuase the attribute id of the festival tag may be empty becuase there is not data for that festival cvc-datatype-valid.1.2.1: '' is not a valid value for 'integer'. cvc-attribute.3: The value '' of attribute 'id' on element 'festival' is not valid with respect to its type, 'integer'. The lines in the schema causing the problems are <xs:element name="user"> <xs:complexType> <xs:attribute name="id" type="xs:integer"/> <xs:sequence> <xs:element ref="personal"/> <xs:element ref="account"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="festival"> <xs:complexType> <xs:attribute name="id" type="xs:integer" user="optional"/> <xs:sequence> <xs:element ref="event"/> <xs:element ref="contact"/> </xs:sequence> </xs:complexType> </xs:element> This is a snippet from my XML file. One user has a festival and the other doesn't <member> <user id="3"> <personal> <name>Skye Saunders</name> <sex>Female</sex> <address1>31 Anns Court</address1> <address2></address2> <city>Cirencester</city> <county>Gloucestershire</county> <postcode>GL7 1JG</postcode> <telephone>01958303514</telephone> <mobile>07260491667</mobile> <email>[email protected]</email> </personal> <account> <username>BigUndecided</username> <password>ea297847f80e046ca24a8621f4068594</password> <userlevel>2</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <festival id=""> <event> <eventname></eventname> <url></url> <datefrom></datefrom> <dateto></dateto> <location></location> <eventpostcode></eventpostcode> <coords> <lat></lat> <lng></lng> </coords> </event> <contact> <conname></conname> <conaddress1></conaddress1> <conaddress2></conaddress2> <concity></concity> <concounty></concounty> <conpostcode></conpostcode> <contelephone></contelephone> <conmobile></conmobile> <fax></fax> <conemail></conemail> </contact> </festival> </member> <member> <user id="4"> <personal> <name>Connor Lawson</name> <sex>Male</sex> <address1>12 Ash Way</address1> <address2></address2> <city>Swindon</city> <county>Wiltshire</county> <postcode>SN3 6GS</postcode> <telephone>01791928119</telephone> <mobile>07338695664</mobile> <email>[email protected]</email> </personal> <account> <username>iTuneStinker</username> <password>3a1f5fda21a07bfff20c41272bae7192</password> <userlevel>3</userlevel> <signupdate>2010-03-26T09:23:50</signupdate> </account> </user> <festival id="1"> <event> <eventname>Oxford Folk Festival</eventname> <url>http://www.oxfordfolkfestival.com/</url> <datefrom>2010-04-07</datefrom> <dateto>2010-04-09</dateto> <location>Oxford</location> <eventpostcode>OX19BE</eventpostcode> <coords> <lat>51.735640</lat> <lng>-1.276136</lng> </coords> </event> <contact> <conname>Stuart Vincent</conname> <conaddress1>P.O. Box 642</conaddress1> <conaddress2></conaddress2> <concity>Oxford</concity> <concounty>Bedfordshire</concounty> <conpostcode>OX13BY</conpostcode> <contelephone>01865 79073</contelephone> <conmobile></conmobile> <fax></fax> <conemail>[email protected]</conemail> </contact> </festival> </member> This is my schema <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified"> <xs:simpleType name="postcode"> <xs:restriction base="xs:string"> <xs:minLength value="6"/> <xs:maxLength value="8"/> </xs:restriction> </xs:simpleType> <xs:simpleType name="telephone"> <xs:restriction base="xs:string"> <xs:minLength value="10"/> <xs:maxLength value="13"/> </xs:restriction> </xs:simpleType> <xs:simpleType name="mobile"> <xs:restriction base="xs:string"> <xs:minLength value="11"/> <xs:maxLength value="11"/> </xs:restriction> </xs:simpleType> <xs:simpleType name="password"> <xs:restriction base="xs:string"> <xs:minLength value="32"/> <xs:maxLength value="32"/> </xs:restriction> </xs:simpleType> <xs:simpleType name="userlevel"> <xs:restriction base="xs:integer"> <xs:enumeration value="1"/> <xs:enumeration value="2"/> <xs:enumeration value="3"/> <xs:enumeration value="4"/> </xs:restriction> </xs:simpleType> <xs:simpleType name="county"> <xs:restriction base="xs:string"> <xs:enumeration value="Bedfordshire"/> <xs:enumeration value="Berkshire"/> <xs:enumeration value="Bristol"/> <xs:enumeration value="Buckinghamshire"/> <xs:enumeration value="Cambridgeshire"/> <xs:enumeration value="Cheshire"/> <xs:enumeration value="Cleveland"/> <xs:enumeration value="Cornwall"/> <xs:enumeration value="Cumberland"/> <xs:enumeration value="Derbyshire"/> <xs:enumeration value="Devon"/> <xs:enumeration value="Dorset"/> <xs:enumeration value="Durham"/> <xs:enumeration value="East Ridings Of Yorkshire"/> <xs:enumeration value="Essex"/> <xs:enumeration value="Gloucestershire"/> <xs:enumeration value="Hampshire"/> <xs:enumeration value="Herefordshire"/> <xs:enumeration value="Hertfordshire"/> <xs:enumeration value="Huntingdonshire"/> <xs:enumeration value="Isle Of Man"/> <xs:enumeration value="Kent"/> <xs:enumeration value="Lancashire"/> <xs:enumeration value="Leicestershire"/> <xs:enumeration value="Lincolnshire"/> <xs:enumeration value="London"/> <xs:enumeration value="Middlesex"/> <xs:enumeration value="Norfolk"/> <xs:enumeration value="North Yorkshire"/> <xs:enumeration value="Northamptonshire"/> <xs:enumeration value="Northumberland"/> <xs:enumeration value="Nottinghamshire"/> <xs:enumeration value="Oxfordshire"/> <xs:enumeration value="Rutland"/> <xs:enumeration value="Shropshire"/> <xs:enumeration value="Somerset"/> <xs:enumeration value="South Yorkshire"/> <xs:enumeration value="Staffordshire"/> <xs:enumeration value="Suffolk"/> <xs:enumeration value="Surrey"/> <xs:enumeration value="Sussex"/> <xs:enumeration value="Tyne and Wear"/> <xs:enumeration value="Warwickshire"/> <xs:enumeration value="West Yorkshire"/> <xs:enumeration value="Westmorland"/> <xs:enumeration value="Wiltshire"/> <xs:enumeration value="Wirral"/> <xs:enumeration value="Worcestershire"/> <xs:enumeration value="Yorkshire"/> </xs:restriction> </xs:simpleType> <xs:element name="folktask"> <xs:complexType> <xs:sequence> <xs:element minOccurs="0" maxOccurs="unbounded" ref="member"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="member"> <xs:complexType> <xs:sequence> <xs:element ref="user" minOccurs="0" maxOccurs="unbounded"/> <xs:element ref="festival" minOccurs="0" maxOccurs="unbounded"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="user"> <xs:complexType> <xs:attribute name="id" type="xs:integer"/> <xs:sequence> <xs:element ref="personal"/> <xs:element ref="account"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="personal"> <xs:complexType> <xs:sequence> <xs:element ref="name"/> <xs:element ref="sex"/> <xs:element ref="address1"/> <xs:element ref="address2"/> <xs:element ref="city"/> <xs:element ref="county"/> <xs:element ref="postcode"/> <xs:element ref="telephone"/> <xs:element ref="mobile"/> <xs:element ref="email"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="name" type="xs:string"/> <xs:element name="sex" type="xs:string"/> <xs:element name="address1" type="xs:string"/> <xs:element name="address2" type="xs:string"/> <xs:element name="city" type="xs:string"/> <xs:element name="county" type="xs:string"/> <xs:element name="postcode" type="postcode"/> <xs:element name="telephone" type="telephone"/> <xs:element name="mobile" type="mobile"/> <xs:element name="email" type="xs:string"/> <xs:element name="account"> <xs:complexType> <xs:sequence> <xs:element ref="username"/> <xs:element ref="password"/> <xs:element ref="userlevel"/> <xs:element ref="signupdate"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="username" type="xs:string"/> <xs:element name="password" type="password"/> <xs:element name="userlevel" type="userlevel"/> <xs:element name="signupdate" type="xs:dateTime"/> <xs:element name="festival"> <xs:complexType> <xs:attribute name="id" type="xs:integer" user="optional"/> <xs:sequence> <xs:element ref="event"/> <xs:element ref="contact"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="event"> <xs:complexType> <xs:sequence> <xs:element ref="eventname"/> <xs:element ref="url"/> <xs:element ref="datefrom"/> <xs:element ref="dateto"/> <xs:element ref="location"/> <xs:element ref="eventpostcode"/> <xs:element ref="coords"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="eventname" type="xs:string"/> <xs:element name="url" type="xs:string"/> <xs:element name="datefrom" type="xs:date"/> <xs:element name="dateto" type="xs:date"/> <xs:element name="location" type="xs:string"/> <xs:element name="eventpostcode" type="postcode"/> <xs:element name="coords"> <xs:complexType> <xs:sequence> <xs:element ref="lat"/> <xs:element ref="lng"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="lat" type="xs:decimal"/> <xs:element name="lng" type="xs:decimal"/> <xs:element name="contact"> <xs:complexType> <xs:sequence> <xs:element ref="conname"/> <xs:element ref="conaddress1"/> <xs:element ref="conaddress2"/> <xs:element ref="concity"/> <xs:element ref="concounty"/> <xs:element ref="conpostcode"/> <xs:element ref="contelephone"/> <xs:element ref="conmobile"/> <xs:element ref="fax"/> <xs:element ref="conemail"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="conname" type="xs:string"/> <xs:element name="conaddress1" type="xs:string"/> <xs:element name="conaddress2" type="xs:string"/> <xs:element name="concity" type="xs:string"/> <xs:element name="concounty" type="xs:string"/> <xs:element name="conpostcode" type="postcode"/> <xs:element name="contelephone" type="telephone"/> <xs:element name="conmobile" type="mobile"/> <xs:element name="fax" type="telephone"/> <xs:element name="conemail" type="xs:string"/> </xs:schema>

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  • XML Schema Header & Namespace Config

    - by zharvey
    Migrating from DTD to XSD and for some reason the transition is a bumpy one. I understand how to define the schema once I'm inside the <xs:schema> root tag, but getting past the header & namespace declaration stuff is proving to be especially confusing for me. I have been trying to follow the well-laid out tutorial on W3S but even that tutorial seems to assume a lot of knowledge up front. I guess what I'm looking for is a King's English explanation of which attributes do what, where they go, and why: xmlns xmlns:xs xmlns:xsi targetNamespace xsi:schemaLocation And in some cases I see different variations of these elements/attributes, such as xsi which seems to have two different notations like xsi:schemaLocation="..." and xs:import schemaLocation="...". I guess between all these slight variations I can't seem to make heads or tails of what each of these does. Thanks in advance for bringing any clarity to this confusion!

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  • How to create schema that have an access as that of dbo and can be accessed by sa user

    - by Shantanu Gupta
    I am new to schema, roles and user management part in sql server. Till now I used to work with simple dbo schema but now after reading few articles I am intrested in creating schema for managing my tables in a folder fashion. At present, I want to create a schema where i want to keep my tables that have same kind of functionality. When I tries to create a schema then I faces a problem while using query, permissions etc. First of all i want to get used to of using schemas then only I want to explore it. But due to initial stages and work pressure as well i m not able to implement it yet. What can i do to start using schema with default permissions as that of dbo. Also let me know about creating roles and assigning roles on these schema. I want all this to be accessible by sa user itself at present. What is the concept behind all these things

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  • Stop node containing subnodes and text in schema

    - by AndyC
    If I have some xml like this: <mynode> <mysubnode> <mysubsubnode>hello world</mysubsubnode> some more text </mysubnode> </mynode> As you can see, mysubnode contains both a subnode and some text data. What I want to know is, is it possible to prevent this happening in a schema? I don't want nodes to contain subnodes and text, just subnodes or text. Is there an option in my xsd I can specify to force this? My program to that uses this xml is written in .NET, so I'll tag it as well incase there's anything of use in .net that I can utilise for this, though I'd much rather that the issue was fixed in the schema itself. Cheers

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  • Thoughts on schemas and schema proliferation

    - by jamiet
    In SQL Server 2005 Microsoft introduced user-schema separation and since then I have seen the use of schemas increase; whereas before I would typically see databases where all objects were in the [dbo] schema I now see databases that have multiple schemas, a database I saw recently had 31 (thirty one) of them. I can’t help but wonder whether this is a good thing or not – clearly 31 is an extreme case but I question whether multiple schemas create more problems than they solve? I have been involved in many discussions that go something like this: Developer #1> “I have a new function to add to the database and I’m not sure which schema to put it in” Developer #2> “What does it do?” Developer #1> “It provides data to a report in Reporting Services” Developer #2> “Ok, so put it in the [reports] schema” Developer #1> “Well I could, but the data will only be used by our Financial reporting folks so shouldn’t I put it in the [financial] schema?” Developer #2> “Maybe, yes” Developer #1> “Mind you, the data is supposed to be used for regulatory reporting to the FSA, should I put it in [regulatory]?” Developer #2> “Err….” You get the idea!!! The more schemas that exist in your database then the more chance that their supposed usages will overlap. I’m left wondering whether the use of schemas is actually necessary. I don’t view really see them as an aid to security because I generally believe that principles should be assigned permissions on objects as-needed on a case-by-case basis (and I have a stock SQL query that deciphers them all for me) so why bother using them at all? I can envisage a use where a database is used to house objects pertaining to many different business functions (which, in itself, is an ambiguous term) and in that circumstance perhaps a schema per business function would be appropriate; hence of late I have been loosely following this edict: If some objects in a database could be moved en masse to another database without the need to remove any foreign key constraints then those objects could legitimately exist in a dedicated schema. I am interested to know what other people’s thoughts are on this. If you would like to share then please do so in the comments. @Jamiet

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  • Developing Schema Compare for Oracle (Part 5): Query Snapshots

    - by Simon Cooper
    If you've emailed us about a bug you've encountered with the EAP or beta versions of Schema Compare for Oracle, we probably asked you to send us a query snapshot of your databases. Here, I explain what a query snapshot is, and how it helps us fix your bug. Problem 1: Debugging users' bug reports When we started the Schema Compare project, we knew we were going to get problems with users' databases - configurations we hadn't considered, features that weren't installed, unicode issues, wierd dependencies... With SQL Compare, users are generally happy to send us a database backup that we can restore using a single RESTORE DATABASE command on our test servers and immediately reproduce the problem. Oracle, on the other hand, would be a lot more tricky. As Oracle generally has a 1-to-1 mapping between instances and databases, any databases users sent would have to be restored to their own instance. Furthermore, the number of steps required to get a properly working database, and the size of most oracle databases, made it infeasible to ask every customer who came across a bug during our beta program to send us their databases. We also knew that there would be lots of issues with data security that would make it hard to get backups. So we needed an easier way to be able to debug customers issues and sort out what strange schema data Oracle was returning. Problem 2: Test execution time Another issue we knew we would have to solve was the execution time of the tests we would produce for the Schema Compare engine. Our initial prototype showed that querying the data dictionary for schema information was going to be slow (at least 15 seconds per database), and this is generally proportional to the size of the database. If you're running thousands of tests on the same databases, each one registering separate schemas, not only would the tests would take hours and hours to run, but the test servers would be hammered senseless. The solution To solve these, we needed to be able to populate the schema of a database without actually connecting to it. Well, the IDataReader interface is the primary way we read data from an Oracle server. The data dictionary queries we use return their data in terms of simple strings and numbers, which we then process and reconstruct into an object model, and the results of these queries are identical for identical schemas. So, we can record the raw results of the queries once, and then replay these results to construct the same object model as many times as required without needing to actually connect to the original database. This is what query snapshots do. They are binary files containing the raw unprocessed data we get back from the oracle server for all the queries we run on the data dictionary to get schema information. The core of the query snapshot generation takes the results of the IDataReader we get from running queries on Oracle, and passes the row data to a BinaryWriter that writes it straight to a file. The query snapshot can then be replayed to create the same object model; when the results of a specific query is needed by the population code, we can simply read the binary data stored in the file on disk and present it through an IDataReader wrapper. This is far faster than querying the server over the network, and allows us to run tests in a reasonable time. They also allow us to easily debug a customers problem; using a simple snapshot generation program, users can generate a query snapshot that could be sent along with a bug report that we can immediately replay on our machines to let us debug the issue, rather than having to obtain database backups and restore databases to test systems. There are also far fewer problems with data security; query snapshots only contain schema information, which is generally less sensitive than table data. Query snapshots implementation However, actually implementing such a feature did have a couple of 'gotchas' to it. My second blog post detailed the development of the dependencies algorithm we use to ensure we get all the dependencies in the database, and that algorithm uses data from both databases to find all the needed objects - what database you're comparing to affects what objects get populated from both databases. We get information on these additional objects using an appropriate WHERE clause on all the population queries. So, in order to accurately replay the results of querying the live database, the query snapshot needs to be a snapshot of a comparison of two databases, not just populating a single database. Furthermore, although the code population queries (eg querying all_tab_cols to get column information) can simply be passed straight from the IDataReader to the BinaryWriter, we need to hook into and run the live dependencies algorithm while we're creating the snapshot to ensure we get the same WHERE clauses, and the same query results, as if we were populating straight from a live system. We also need to store the results of the dependencies queries themselves, as the resulting dependency graph is stored within the OracleDatabase object that is produced, and is later used to help order actions in synchronization scripts. This is significantly helped by the dependencies algorithm being a deterministic algorithm - given the same input, it will always return the same output. Therefore, when we're replaying a query snapshot, and processing dependency information, we simply have to return the results of the queries in the order we got them from the live database, rather than trying to calculate the contents of all_dependencies on the fly. Query snapshots are a significant feature in Schema Compare that really helps us to debug problems with the tool, as well as making our testers happier. Although not really user-visible, they are very useful to the development team to help us fix bugs in the product much faster than we otherwise would be able to.

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  • Sql Server Compact - Schema Management

    - by Richard B
    I've been searching for some time for a good solution to implement the idea of managing schema on a Sql Server Compact 3.5 db. I know of several ways of managing schema on Sql Express/std/enterprise, but Compact Edition doesn't support the necessary tools required to use the same methodology. Any suggestions/tips? I should expand this to say that it is for 100+ clients with wrapperware software. As the system changes, I need to publish update scripts alongside the new binaries to the client. I was looking for a decent method by which to publish this without having to just hand the client a script file and say "Run this in SSMSE". Most clients are not capable of doing such a beast. A buddy of mine disclosed a partial script on how to handle the SQL Server piece of my task, but never worked on Compact Edition... It looks like I'll be on my own for this. What I think that I've decided to do, and it's going to need a "geek week" to accomplish, is that I'm going to write some sort of tool much like how WiX and nAnt works, so that I can just write an overzealous Xml document to handle the work. If I think that it is worthwhile, I'll publish it on CodePlex and/or CodeProject because I've used both sites a bit to gain better understanding of concepts for jobs I've done in the past, and I think it is probably worthwhile to give back a little.

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  • PHP - Database schema: version control, branching, migrations.

    - by Billiam
    I'm trying to come up with (or find) a reusable system for database schema versioning in php projects. There are a number of Rails-style migration projects available for php. http://code.google.com/p/mysql-php-migrations/ is a good example. It uses timestamps for migration files, which helps with conflicts between branches. General problem with this kind of system: When development branch A is checked out, and you want to check out branch B instead, B may have new migration files. This is fine, migrating to newer content is straight forward. If branch A has newer migration files, you would need to migrate downwards to the nearest shared patch. If branch A and B have significantly different code bases, you may have to migrate down even further. This may mean: Check out B, determine shared patch number, check out A, migrate downwards to this patch. This must be done from A since the actual applied patches are not available in B. Then, checkout branch B, and migrate to newest B patch. Reverse process again when going from B to A. Proposed system: When migrating upwards, instead of just storing the patch version, serialize the whole patch in database for later use, though I'd probably only need the down() method. When changing branches, compare patches that have been run to patches that are available in the destination branch. Determine nearest shared patch (or oldest difference, maybe) between db table of run patches and patches in destination branch by ID or hash. Could also look for new or missing patches that are buried under a number of shared patches between the two branches. Automatically merge down to the nearest shared patch, using the db table stored down() methods, and then merge up to the branche's latest patch. My question is: Is this system too crazy and/or fraught with consequences to bother developing? My experience with database schema versioning is limited to PHP autopatch, which is an up()-only system requiring filenames with sequential IDs.

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  • How to reuse results with a schema for end of day stock-data

    - by Vishalrix
    I am creating a database schema to be used for technical analysis like top-volume gainers, top-price gainers etc.I have checked answers to questions here, like the design question. Having taken the hint from boe100 's answer there I have a schema modeled pretty much on it, thusly: Symbol - char 6 //primary Date - date //primary Open - decimal 18, 4 High - decimal 18, 4 Low - decimal 18, 4 Close - decimal 18, 4 Volume - int Right now this table containing End Of Day( EOD) data will be about 3 million rows for 3 years. Later when I get/need more data it could be 20 million rows. The front end will be asking requests like "give me the top price gainers on date X over Y days". That request is one of the simpler ones, and as such is not too costly, time wise, I assume. But a request like " give me top volume gainers for the last 10 days, with the previous 100 days acting as baseline", could prove 10-100 times costlier. The result of such a request would be a float which signifies how many times the volume as grown etc. One option I have is adding a column for each such result. And if the user asks for volume gain in 10 days over 20 days, that would require another table. The total such tables could easily cross 100, specially if I start using other results as tables, like MACD-10, MACD-100. each of which will require its own column. Is this a feasible solution? Another option being that I keep the result in cached html files and present them to the user. I dont have much experience in web-development, so to me it looks messy; but I could be wrong ( ofc!) . Is that a option too? Let me add that I am/will be using mod_perl to present the response to the user. With much of the work on mysql database being done using perl. I would like to have a response time of 1-2 seconds.

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  • Create XML File Using XML Schema

    - by metdos
    Is there any easy way to create at least a template XML file using XML Schema? My main interest is bounded by C++, but discussions of other programming languages are also welcome.By the way I also use QT framework.

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  • Specify XML schema data type of decimal or blank

    - by Jeremy Stein
    Is there a way in an XML schema to specify that an element may contain either an empty string or a decimal? If I specify the type as xs:decimal like this: <xs:element name="Sample" type="xs:decimal" /> then a blank value would not pass validation: <Sample/> (I realize that the best way to indicate no value would be to not include the element, but I was wondering if there was a way to allow blank or decimal.)

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  • Automatic database schema generation and migration with Perl

    - by pistacchio
    In Ror or Django or web2py you can "describe" a database (as a set of classes that remaps to tables) and the framework (having being provided with a connection string to the desired database) generates the tables, fields, relations and in the case of RoR and web2py it also keeps it up-to-date (eg, removing a class drops the table, adding a property to the class triggers an "alter table add" etc). Is there any Perl module that does the same? Eg, it takes the YAML/XML/JSON description of a database as input and modifies/generates the database schema accordingly?

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  • Any good SQL Anywhere database schema comparison tools?

    - by Lurker Indeed
    Are there any good database schema comparison tools out there that support Sybase SQL Anywhere version 10? I've seen a litany of them for SQL Server, a few for MySQL and Oracle, but nothing that supports SQL Anywhere correctly. I tried using DB Solo, but it turned all my non-unique indexes into unique ones, and I didn't see any options to change that.

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