Database Access using Advanced Business Application Programming (ABAP)
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by Arindam Ghosh
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Database Interface

Each work process on an application server must have a database interface if you want to make the R/3 system independent of the database system, and also to use it correctly despite the differences in the SQL syntax between various databases. By means of this interface only, the R/3 system can communicate with the database. All of the database requests from the R/3 system are converted into the correct Standard SQL statements for the database system by the database interface. In order to perform this function, it has to use a database-specific component, which shields the differences between database systems from the rest of the database interface. You have to choose the appropriate layer when installing the R/3 system. A user can access a database from a program through Open SQL and Native SQL.

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