SQLParser_Implemented

SQL Parser

Goal of the SQL parser is to convert some SQL source code to an internal representation. The current implementation convert the source code to a set of objects using classes implemented in the runtime package.

The current implementation use the ANTLR tool - a parser generator. With ANTLR, a configuration file define the vocabulary and the grammar rules for the language. The tool then generate the source code of the parser that will parse a text and retrieve the different rules used in the SQL source code. When parsing a source text, the ANTLR runtime will call a visitor method for each grammar rules used in the source code.

SQL parser is included in org.whitebear.sql package and is currently under development

Main classes

• SqlVisitor define the available visitor methods - interface file generated by ANTLR
• Translator, StatementTranslator, and ExpressionTranslator. Implements the interface above - the visitor methods that instantiate objects of the runtime package - internal representation of the related SQL construct