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45 lines
No EOL
2.4 KiB
C++
45 lines
No EOL
2.4 KiB
C++
topic "U++ SQL Basics";
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[ $$0,0#00000000000000000000000000000000:Default]
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[b83;*4 $$1,0#07864147445237544204411237157677:title]
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[b83;_R+117 $$2,0#50327538467692101372348457405326:heading1]
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[b50;a25;*R2 $$3,3#10189570498413014020290115411120:heading2]
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[l25;b25;a25;R2 $$4,4#24747716437513346533020414014942:text2]
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[{_}%EN-US
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[s1; U`+`+ SQL&]
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[s2; U`+`+ SQL Basics&]
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[s3; Database Model&]
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[s4; The database model is described by the user in schema (`".sch`")
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files. The user models the database and U`+`+ SQL packages handle
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the creation/modification of the database.&]
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[s3; Schema description files (.sch) and sql script files (.sql)&]
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[s4; Each database should be described in a schema description file,
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which is a file with extension `".sch`" and . describes what
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tables you want to have in the database. U`+`+ SQL packages will
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take the schema, create `".sql`" script files from it (containing
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DDL statements like `'create table`'...) and execute them against
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the database to realize your database table structure (you do
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not need to write sql statements, U`+`+ will generate them for
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you.)&]
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[s4; To add this file to your Upp package, make sure your package
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is selected in the package list (located at the top`-left of
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TheIDE), right`-click on the white`-space in the file list (underneath
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the package list at bottom`-left), and select `"Insert package
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directory file(s)`". Then give the new name of your file (eg.
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`"MyDatabase.sch`") and click `"Open`". The new file will show
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up in your file list. &]
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[s3; SQL Create, Read, Update, Delete (CRUD)&]
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[s4; The four basic functions of database storage are all supported,
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with the ability to have U`+`+ generate the sql statements for
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you. The SQL code written using U`+`+ acts as a supplement for
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writing sql queries themselves. The code is much more descriptive
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and easier to read than SQL. In fact, sql scripts and query strings
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are generated by the U`+`+ SQL classes, and you can view the
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generated queries with a simple method call.&]
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[s3; Schema Update/Upgrade&]
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[s4; The SQL packages also allow for database updates without losing
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your stored data. The main purpose is to allow incremental development
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of the model. This functionality is limited though, as it is
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implemented using `"ALTER`" sql commands and does not support
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removing columns or changing datatypes. Those functions have
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to be done manually. &]
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[s0; ] |