grn_expr is an grn_obj that represents an expression. Here is a list of what expression can do:
- Expression can apply some operations to a record by grn_expr_exec().
- Expression can represents search condition. grn_table_select() can select records that match against the search condition represented by expression.
There are two string representations of expression:
grn_expr_parse() parses string represented expression and appends the parsed expression to another expression.
TODO...
Escapes target_characters in string by escape_character.
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Returns: | GRN_SUCCESS on success, not GRN_SUCCESS on error. |
Escapes special characters in Query syntax.
Parameters: |
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Returns: | GRN_SUCCESS on success, not GRN_SUCCESS on error. |