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Annotation of parser3/src/classes/void.C, revision 1.59

1.1       parser      1: /** @file
                      2:        Parser: @b VOID parser class.
                      3: 
1.59    ! moko        4:        Copyright (c) 2001-2023 Art. Lebedev Studio (http://www.artlebedev.com)
        !             5:        Authors: Konstantin Morshnev <moko@design.ru>, Alexandr Petrosian <paf@design.ru>
1.20      paf         6: */
1.1       parser      7: 
                      8: #include "classes.h"
1.29      paf         9: #include "pa_vmethod_frame.h"
                     10: 
1.1       parser     11: #include "pa_request.h"
                     12: #include "pa_vvoid.h"
                     13: #include "pa_sql_connection.h"
                     14: 
1.59    ! moko       15: volatile const char * IDENT_VOID_C="$Id: void.C,v 1.58 2020/12/15 17:10:29 moko Exp $";
1.33      paf        16: 
1.1       parser     17: // class
                     18: 
1.29      paf        19: class MVoid: public Methoded {
1.1       parser     20: public:
1.29      paf        21:        MVoid();
1.1       parser     22: };
                     23: 
1.48      moko       24: // void is inherited from string, thus global variable declared in string.C
1.29      paf        25: 
1.1       parser     26: // methods
                     27: 
1.5       parser     28: #ifndef DOXYGEN
1.26      paf        29: class Void_sql_event_handlers: public SQL_Driver_query_event_handlers {
1.5       parser     30: public:
1.29      paf        31:        bool add_column(SQL_Error& /*error*/, const char* /*str*/, size_t /*length*/) { /* ignore */ return false; }
1.27      paf        32:        bool before_rows(SQL_Error& error) {
1.5       parser     33:                // there are some result rows, which is wrong
1.57      moko       34:                error=SQL_Error("must return nothing");
1.27      paf        35:                return true;
1.5       parser     36:        }
1.27      paf        37:        bool add_row(SQL_Error& /*error*/) { /* never */ return false; }
1.29      paf        38:        bool add_row_cell(SQL_Error& /*error*/, const char* /*str*/, size_t /*length*/) { /* never */ return false; }
1.5       parser     39: 
                     40: };
                     41: #endif
1.34      paf        42: 
                     43: extern int marshal_binds(HashStringValue& hash, SQL_Driver::Placeholder*& placeholders);
                     44: extern void unmarshal_bind_updates(HashStringValue& hash, int placeholder_count, SQL_Driver::Placeholder* placeholders);
                     45: 
1.29      paf        46: static void _sql(Request& r, MethodParams& params) {
                     47:        Value& statement=params.as_junction(0, "statement must be code");
1.1       parser     48: 
1.33      paf        49:        HashStringValue* bind=0;
1.49      misha      50:        if(params.count()>1)
1.51      misha      51:                if(HashStringValue* options=params.as_hash(1, "sql options")) {
1.49      misha      52:                        int valid_options=0;
                     53:                        if(Value* vbind=options->get(sql_bind_name)) {
                     54:                                valid_options++;
                     55:                                bind=vbind->get_hash();
                     56:                        }
                     57:                        if(valid_options!=options->count())
                     58:                                throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
                     59:                }
1.33      paf        60: 
                     61:        SQL_Driver::Placeholder* placeholders=0;
                     62:        uint placeholders_count=0;
                     63:        if(bind)
                     64:                placeholders_count=marshal_binds(*bind, placeholders);
                     65: 
1.18      paf        66:        const String& statement_string=r.process_to_string(statement);
1.54      moko       67:        const char* statement_cstr=statement_string.untaint_cstr(String::L_SQL, r.connection());
1.43      misha      68: 
1.57      moko       69:        Void_sql_event_handlers handlers;
                     70:        r.connection()->query(statement_cstr, placeholders_count, placeholders, 0, SQL_NO_LIMIT, handlers, statement_string);
1.34      paf        71: 
                     72:        if(bind)
                     73:                unmarshal_bind_updates(*bind, placeholders_count, placeholders);
1.1       parser     74: }
                     75: 
                     76: // constructor
                     77: 
1.53      moko       78: MVoid::MVoid(): Methoded("void") {
                     79:        set_base(string_class);
                     80: 
1.41      misha      81:        // ^void:sql{query}
1.33      paf        82:        add_native_method("sql", Method::CT_STATIC, _sql, 1, 2);
1.32      paf        83: 
1.48      moko       84:        // all other methods are inherinted from empty string
1.1       parser     85: }