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  2. Data definition language - Wikipedia

    en.wikipedia.org/wiki/Data_definition_language

    Saving a ddl file in Oracle SQL Developer. In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as tables, indices, and users. DDL statements are similar to a computer programming language for defining data structures, especially database schemas.

  3. Data access layer - Wikipedia

    en.wikipedia.org/wiki/Data_access_layer

    If the data access layer supports multiple database types, the application becomes able to use whatever databases the DAL can talk to. In either circumstance, having a data access layer provides a centralized location for all calls into the database, and thus makes it easier to port the application to other database systems (assuming that 100% ...

  4. Data query language - Wikipedia

    en.wikipedia.org/wiki/Data_query_language

    Data query language (DQL) is part of the base grouping of SQL sub-languages. These sub-languages are mainly categorized into four categories: a data query language (DQL), a data definition language (DDL), a data control language (DCL), and a data manipulation language (DML).

  5. Open Data Description Language - Wikipedia

    en.wikipedia.org/wiki/Open_Data_Description_Language

    The Open Data Description Language (OpenDDL) is a generic text-based language that is designed to store arbitrary data in a concise human-readable format.It can be used as a means for easily exchanging information among many programs or simply as a method for storing a program's data in an editable format.

  6. List of Unified Modeling Language tools - Wikipedia

    en.wikipedia.org/wiki/List_of_Unified_Modeling...

    Forward and Reverse Engineering for code and Database. Model Driven Integrated Development (Edit/Build/Debug) for Java, .Net, PHP & GNU compilers. Simulates Activity, State Machine, Sequence and BPMN diagrams.

  7. Language Integrated Query - Wikipedia

    en.wikipedia.org/wiki/Language_Integrated_Query

    The Table<T> encapsulates the data in the table, and implements the IQueryable<T> interface, so that the expression tree is created, which the LINQ to SQL provider handles. It converts the query into T-SQL and retrieves the result set from the database server. Since the processing happens at the database server, local methods, which are not ...

  8. Data access object - Wikipedia

    en.wikipedia.org/wiki/Data_Access_Object

    In software, a data access object (DAO) is a pattern that provides an abstract interface to some type of database or other persistence mechanism.By mapping application calls to the persistence layer, the DAO provides data operations without exposing database details.

  9. Don't repeat yourself - Wikipedia

    en.wikipedia.org/wiki/Don't_repeat_yourself

    The text string "comment" might be repeated in the label, the HTML tag, in a read function name, a private variable, database DDL, queries, and so on. A DRY approach eliminates that redundancy by using frameworks that reduce or eliminate all those editing tasks except the most important ones, leaving the extensibility of adding new knowledge ...