Class: Chdb::LocalResult

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/chdb/local_result.rb,
ext/chdb/chdb.c

Overview

Handles ClickHouse query results with support for CSV and JSON formats, providing enumerable access to result rows and column information

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(argc, argv) ⇒ Object 



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# File 'ext/chdb/chdb.c', line 38

static VALUE local_result_initialize(VALUE self, VALUE argc, VALUE argv) {
    DEBUG_PRINT("Initializing LocalResult with %d arguments", NUM2INT(argc));

    // Type checking
    Check_Type(argc, T_FIXNUM);
    Check_Type(argv, T_ARRAY);

    int c_argc = NUM2INT(argc);
    if (c_argc < 0) {
        rb_raise(rb_eArgError, "Argument count cannot be negative");
    }
    if (c_argc > CHDB_MAX_ARGS) {
        rb_raise(rb_eArgError, "Too many arguments (max: %d)", CHDB_MAX_ARGS);
    }

    char **c_argv = ALLOC_N(char *, c_argc);

    for (int i = 0; i < c_argc; i++) {
        VALUE arg = rb_ary_entry(argv, i);
        c_argv[i] = StringValueCStr(arg);
    }

    LocalResult *result;
    Data_Get_Struct(self, LocalResult, result);

    // Execute query
    result->c_result = query_stable_v2(c_argc, c_argv);

    if (!result->c_result) {
        xfree(c_argv);
        rb_gc_unregister_address(&argv);
        rb_raise(cChdbError, "chDB query returned nil");
    }

    if (result->c_result->error_message) {
        VALUE error_message = rb_str_new_cstr(result->c_result->error_message);
        // Create error context
        VALUE context = rb_hash_new();
        rb_hash_aset(context, ID2SYM(rb_intern("args")), argv);
        rb_hash_aset(context, ID2SYM(rb_intern("error")), error_message);

        xfree(c_argv);
        rb_gc_unregister_address(&argv);
        rb_raise(cChdbError, "chDB error: %s", StringValueCStr(error_message));
    }

    xfree(c_argv);
    rb_gc_unregister_address(&argv);
    DEBUG_PRINT("LocalResult initialization complete");
    return self;
}

Instance Attribute Details

#output_format ⇒ Object

Returns the value of attribute output_format.



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# File 'lib/chdb/local_result.rb', line 12

def output_format
  @output_format
end

Instance Method Details

#buf ⇒ Object 



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# File 'ext/chdb/chdb.c', line 90

static VALUE local_result_buf(VALUE self) {
    LocalResult *result;
    Data_Get_Struct(self, LocalResult, result);

    if (!result->c_result || !result->c_result->buf) {
        DEBUG_PRINT("Buffer access attempted on empty result");
        return Qnil;
    }

    DEBUG_PRINT("Returning buffer of length %zu", result->c_result->len);
    return rb_str_new(result->c_result->buf, result->c_result->len);
}

#columns ⇒ Object 



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# File 'lib/chdb/local_result.rb', line 22

def columns
  @columns ||= extract_columns
end

#each(&block) ⇒ Object 



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# File 'lib/chdb/local_result.rb', line 26

def each(&block)
  rows.each(&block)
end

#elapsed ⇒ Object 



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# File 'ext/chdb/chdb.c', line 103

static VALUE local_result_elapsed(VALUE self) {
    LocalResult *result;
    Data_Get_Struct(self, LocalResult, result);
    DEBUG_PRINT("Query elapsed time: %f", result->c_result->elapsed);
    return DBL2NUM(result->c_result->elapsed);
}

#rows ⇒ Object 



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# File 'lib/chdb/local_result.rb', line 18

def rows
  @rows ||= parse_buffer
end

#to_s ⇒ Object 



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# File 'lib/chdb/local_result.rb', line 14

def to_s
  buf
end