Result

class
Superclass
rb_cObject
Included Modules
Enumerable
rb_mPGconstants

The class to represent the query result tuples (rows). An instance of this class is created as the result of every query.

Since pg-1.1 the amount of memory in use by a PG::Result object is estimated and passed to ruby's garbage collector. You can invoke the clear method to force deallocation of memory of the instance when finished with the result for better memory performance.

Example:

require 'pg'
conn = PG.connect(:dbname => 'test')
res  = conn.exec('SELECT 1 AS a, 2 AS b, NULL AS c')
res.getvalue(0,0) # '1'
res[0]['b']       # '2'
res[0]['c']       # nil

Public Instance Methods

anchor
res[ n ] → Hash

Returns tuple n as a hash.

static VALUE
pgresult_aref(VALUE self, VALUE index)
{
        t_pg_result *this = pgresult_get_this_safe(self);
        int tuple_num = NUM2INT(index);
        int field_num;
        int num_tuples = PQntuples(this->pgresult);
        VALUE tuple;

        if( this->nfields == -1 )
                pgresult_init_fnames( self );

        if ( tuple_num < 0 || tuple_num >= num_tuples )
                rb_raise( rb_eIndexError, "Index %d is out of range", tuple_num );

        /* We reuse the Hash of the previous output for larger row counts.
         * This is somewhat faster than populating an empty Hash object. */
        tuple = NIL_P(this->tuple_hash) ? rb_hash_new() : this->tuple_hash;
        for ( field_num = 0; field_num < this->nfields; field_num++ ) {
                VALUE val = this->p_typemap->funcs.typecast_result_value(this->p_typemap, self, tuple_num, field_num);
                rb_hash_aset( tuple, this->fnames[field_num], val );
        }
        /* Store a copy of the filled hash for use at the next row. */
        if( num_tuples > 10 )
                this->tuple_hash = rb_hash_dup(tuple);

        return tuple;
}
anchor
autoclear? → boolean

Returns true if the underlying C struct will be cleared automatically by libpq. Elsewise the result is cleared by #clear or by the GC when it's no longer in use.

VALUE
pgresult_autoclear_p( VALUE self )
{
        t_pg_result *this = pgresult_get_this(self);
        return this->autoclear ? Qtrue : Qfalse;
}
anchor
check → nil

Raises appropriate exception if PG::Result is in a bad state.

VALUE
pg_result_check( VALUE self )
{
        t_pg_result *this = pgresult_get_this(self);
        VALUE error, exception, klass;
        char * sqlstate;

        if(this->pgresult == NULL)
        {
                PGconn *conn = pg_get_pgconn(this->connection);
                error = rb_str_new2( PQerrorMessage(conn) );
        }
        else
        {
                switch (PQresultStatus(this->pgresult))
                {
                case PGRES_TUPLES_OK:
                case PGRES_COPY_OUT:
                case PGRES_COPY_IN:
                case PGRES_COPY_BOTH:
                case PGRES_SINGLE_TUPLE:
                case PGRES_EMPTY_QUERY:
                case PGRES_COMMAND_OK:
                        return self;
                case PGRES_BAD_RESPONSE:
                case PGRES_FATAL_ERROR:
                case PGRES_NONFATAL_ERROR:
                        error = rb_str_new2( PQresultErrorMessage(this->pgresult) );
                        break;
                default:
                        error = rb_str_new2( "internal error : unknown result status." );
                }
        }

        PG_ENCODING_SET_NOCHECK( error, ENCODING_GET(self) );

        sqlstate = PQresultErrorField( this->pgresult, PG_DIAG_SQLSTATE );
        klass = lookup_error_class( sqlstate );
        exception = rb_exc_new3( klass, error );
        rb_iv_set( exception, "@connection", this->connection );
        rb_iv_set( exception, "@result", this->pgresult ? self : Qnil );
        rb_exc_raise( exception );

        /* Not reached */
        return self;
}
Also aliased as: check_result
anchor
check_result()
Alias for: check
anchor
clear() → nil

Clears the PG::Result object as the result of a query. This frees all underlying memory consumed by the result object. Afterwards access to result methods raises PG::Error “result has been cleared”.

Explicit calling clear can lead to better memory performance, but is not generally necessary. Special care must be taken when PG::Tuple objects are used. In this case clear must not be called unless all PG::Tuple objects of this result are fully materialized.

If #autoclear? is true then the result is marked as cleared and the underlying C struct will be cleared automatically by libpq.

VALUE
pg_result_clear(VALUE self)
{
        t_pg_result *this = pgresult_get_this(self);
        pgresult_clear( this );
        return Qnil;
}
anchor
cleared? → boolean

Returns true if the backend result memory has been free'd.

VALUE
pgresult_cleared_p( VALUE self )
{
        t_pg_result *this = pgresult_get_this(self);
        return this->pgresult ? Qfalse : Qtrue;
}
anchor
cmd_status() → String

Returns the status string of the last query command.

static VALUE
pgresult_cmd_status(VALUE self)
{
        VALUE ret = rb_tainted_str_new2(PQcmdStatus(pgresult_get(self)));
        PG_ENCODING_SET_NOCHECK(ret, ENCODING_GET(self));
        return ret;
}
anchor
cmd_tuples() → Integer

Returns the number of tuples (rows) affected by the SQL command.

If the SQL command that generated the PG::Result was not one of:

  • SELECT

  • CREATE TABLE AS

  • INSERT

  • UPDATE

  • DELETE

  • MOVE

  • FETCH

  • COPY

  • an EXECUTE of a prepared query that contains an INSERT, UPDATE, or DELETE statement

or if no tuples were affected, 0 is returned.

static VALUE
pgresult_cmd_tuples(VALUE self)
{
        long n;
        n = strtol(PQcmdTuples(pgresult_get(self)),NULL, 10);
        return INT2NUM(n);
}
Also aliased as: cmdtuples
anchor
cmdtuples()
Alias for: cmd_tuples
anchor
column_values( n ) → array

Returns an Array of the values from the nth column of each tuple in the result.

static VALUE
pgresult_column_values(VALUE self, VALUE index)
{
        int col = NUM2INT( index );
        return make_column_result_array( self, col );
}
anchor
each{ |tuple| ... }

Invokes block for each tuple in the result set.

static VALUE
pgresult_each(VALUE self)
{
        PGresult *result;
        int tuple_num;

        RETURN_SIZED_ENUMERATOR(self, 0, NULL, pgresult_ntuples_for_enum);

        result = pgresult_get(self);

        for(tuple_num = 0; tuple_num < PQntuples(result); tuple_num++) {
                rb_yield(pgresult_aref(self, INT2NUM(tuple_num)));
        }
        return self;
}
anchor
each_row { |row| ... }

Yields each row of the result. The row is a list of column values.

static VALUE
pgresult_each_row(VALUE self)
{
        t_pg_result *this;
        int row;
        int field;
        int num_rows;
        int num_fields;

        RETURN_SIZED_ENUMERATOR(self, 0, NULL, pgresult_ntuples_for_enum);

        this = pgresult_get_this_safe(self);
        num_rows = PQntuples(this->pgresult);
        num_fields = PQnfields(this->pgresult);

        for ( row = 0; row < num_rows; row++ ) {
                PG_VARIABLE_LENGTH_ARRAY(VALUE, row_values, num_fields, PG_MAX_COLUMNS)

                /* populate the row */
                for ( field = 0; field < num_fields; field++ ) {
                        row_values[field] = this->p_typemap->funcs.typecast_result_value(this->p_typemap, self, row, field);
                }
                rb_yield( rb_ary_new4( num_fields, row_values ));
        }

        return Qnil;
}
anchor
error_field(fieldcode) → String

Returns the individual field of an error.

fieldcode is one of:

  • PG_DIAG_SEVERITY

  • PG_DIAG_SQLSTATE

  • PG_DIAG_MESSAGE_PRIMARY

  • PG_DIAG_MESSAGE_DETAIL

  • PG_DIAG_MESSAGE_HINT

  • PG_DIAG_STATEMENT_POSITION

  • PG_DIAG_INTERNAL_POSITION

  • PG_DIAG_INTERNAL_QUERY

  • PG_DIAG_CONTEXT

  • PG_DIAG_SOURCE_FILE

  • PG_DIAG_SOURCE_LINE

  • PG_DIAG_SOURCE_FUNCTION

An example:

begin
    conn.exec( "SELECT * FROM nonexistant_table" )
rescue PG::Error => err
    p [
        err.result.error_field( PG::Result::PG_DIAG_SEVERITY ),
        err.result.error_field( PG::Result::PG_DIAG_SQLSTATE ),
        err.result.error_field( PG::Result::PG_DIAG_MESSAGE_PRIMARY ),
        err.result.error_field( PG::Result::PG_DIAG_MESSAGE_DETAIL ),
        err.result.error_field( PG::Result::PG_DIAG_MESSAGE_HINT ),
        err.result.error_field( PG::Result::PG_DIAG_STATEMENT_POSITION ),
        err.result.error_field( PG::Result::PG_DIAG_INTERNAL_POSITION ),
        err.result.error_field( PG::Result::PG_DIAG_INTERNAL_QUERY ),
        err.result.error_field( PG::Result::PG_DIAG_CONTEXT ),
        err.result.error_field( PG::Result::PG_DIAG_SOURCE_FILE ),
        err.result.error_field( PG::Result::PG_DIAG_SOURCE_LINE ),
        err.result.error_field( PG::Result::PG_DIAG_SOURCE_FUNCTION ),
    ]
end

Outputs:

["ERROR", "42P01", "relation \"nonexistant_table\" does not exist", nil, nil,
 "15", nil, nil, nil, "path/to/parse_relation.c", "857", "parserOpenTable"]
static VALUE
pgresult_error_field(VALUE self, VALUE field)
{
        PGresult *result = pgresult_get( self );
        int fieldcode = NUM2INT( field );
        char * fieldstr = PQresultErrorField( result, fieldcode );
        VALUE ret = Qnil;

        if ( fieldstr ) {
                ret = rb_tainted_str_new2( fieldstr );
                PG_ENCODING_SET_NOCHECK( ret, ENCODING_GET(self ));
        }

        return ret;
}
Also aliased as: result_error_field
anchor
error_message() → String

Returns the error message of the command as a string.

static VALUE
pgresult_error_message(VALUE self)
{
        VALUE ret = rb_tainted_str_new2(PQresultErrorMessage(pgresult_get(self)));
        PG_ENCODING_SET_NOCHECK(ret, ENCODING_GET(self));
        return ret;
}
Also aliased as: result_error_message
anchor
fformat( column_number ) → Integer

Returns the format (0 for text, 1 for binary) of column column_number.

Raises ArgumentError if column_number is out of range.

static VALUE
pgresult_fformat(VALUE self, VALUE column_number)
{
        PGresult *result = pgresult_get(self);
        int fnumber = NUM2INT(column_number);
        if (fnumber < 0 || fnumber >= PQnfields(result)) {
                rb_raise(rb_eArgError, "Column number is out of range: %d",
                        fnumber);
        }
        return INT2FIX(PQfformat(result, fnumber));
}
anchor
field_values( field ) → array

Returns an Array of the values from the given field of each tuple in the result.

static VALUE
pgresult_field_values( VALUE self, VALUE field )
{
        PGresult *result = pgresult_get( self );
        const char *fieldname = StringValueCStr( field );
        int fnum = PQfnumber( result, fieldname );

        if ( fnum < 0 )
                rb_raise( rb_eIndexError, "no such field '%s' in result", fieldname );

        return make_column_result_array( self, fnum );
}
anchor
fields() → Array

Returns an array of Strings representing the names of the fields in the result.

static VALUE
pgresult_fields(VALUE self)
{
        t_pg_result *this = pgresult_get_this_safe(self);

        if( this->nfields == -1 )
                pgresult_init_fnames( self );

        return rb_ary_new4( this->nfields, this->fnames );
}
anchor
fmod( column_number )

Returns the type modifier associated with column column_number. See the ftype method for an example of how to use this.

Raises an ArgumentError if column_number is out of range.

static VALUE
pgresult_fmod(VALUE self, VALUE column_number)
{
        PGresult *result = pgresult_get(self);
        int fnumber = NUM2INT(column_number);
        int modifier;
        if (fnumber < 0 || fnumber >= PQnfields(result)) {
                rb_raise(rb_eArgError, "Column number is out of range: %d",
                        fnumber);
        }
        modifier = PQfmod(result,fnumber);

        return INT2NUM(modifier);
}
anchor
fname( index ) → String

Returns the name of the column corresponding to index.

static VALUE
pgresult_fname(VALUE self, VALUE index)
{
        VALUE fname;
        PGresult *result = pgresult_get(self);
        int i = NUM2INT(index);

        if (i < 0 || i >= PQnfields(result)) {
                rb_raise(rb_eArgError,"invalid field number %d", i);
        }

        fname = rb_tainted_str_new2(PQfname(result, i));
        PG_ENCODING_SET_NOCHECK(fname, ENCODING_GET(self));
        return rb_obj_freeze(fname);
}
anchor
fnumber( name ) → Integer

Returns the index of the field specified by the string name. The given name is treated like an identifier in an SQL command, that is, it is downcased unless double-quoted. For example, given a query result generated from the SQL command:

result = conn.exec( %Q{SELECT 1 AS FOO, 2 AS "BAR"} )

we would have the results:

result.fname( 0 )            # => "foo"
result.fname( 1 )            # => "BAR"
result.fnumber( "FOO" )      # => 0
result.fnumber( "foo" )      # => 0
result.fnumber( "BAR" )      # => ArgumentError
result.fnumber( %Q{"BAR"} )   # => 1

Raises an ArgumentError if the specified name isn't one of the field names; raises a TypeError if name is not a String.

static VALUE
pgresult_fnumber(VALUE self, VALUE name)
{
        int n;

        Check_Type(name, T_STRING);

        n = PQfnumber(pgresult_get(self), StringValueCStr(name));
        if (n == -1) {
                rb_raise(rb_eArgError,"Unknown field: %s", StringValueCStr(name));
        }
        return INT2FIX(n);
}
anchor
fsize( index )

Returns the size of the field type in bytes. Returns -1 if the field is variable sized.

res = conn.exec("SELECT myInt, myVarChar50 FROM foo")
res.size(0) => 4
res.size(1) => -1
static VALUE
pgresult_fsize(VALUE self, VALUE index)
{
        PGresult *result;
        int i = NUM2INT(index);

        result = pgresult_get(self);
        if (i < 0 || i >= PQnfields(result)) {
                rb_raise(rb_eArgError,"invalid field number %d", i);
        }
        return INT2NUM(PQfsize(result, i));
}
anchor
ftable( column_number ) → Integer

Returns the Oid of the table from which the column column_number was fetched.

Raises ArgumentError if column_number is out of range or if the Oid is undefined for that column.

static VALUE
pgresult_ftable(VALUE self, VALUE column_number)
{
        Oid n ;
        int col_number = NUM2INT(column_number);
        PGresult *pgresult = pgresult_get(self);

        if( col_number < 0 || col_number >= PQnfields(pgresult))
                rb_raise(rb_eArgError,"Invalid column index: %d", col_number);

        n = PQftable(pgresult, col_number);
        return UINT2NUM(n);
}
anchor
ftablecol( column_number ) → Integer

Returns the column number (within its table) of the table from which the column column_number is made up.

Raises ArgumentError if column_number is out of range or if the column number from its table is undefined for that column.

static VALUE
pgresult_ftablecol(VALUE self, VALUE column_number)
{
        int col_number = NUM2INT(column_number);
        PGresult *pgresult = pgresult_get(self);

        int n;

        if( col_number < 0 || col_number >= PQnfields(pgresult))
                rb_raise(rb_eArgError,"Invalid column index: %d", col_number);

        n = PQftablecol(pgresult, col_number);
        return INT2FIX(n);
}
anchor
ftype( column_number ) → Integer

Returns the data type associated with column_number.

The integer returned is the internal OID number (in PostgreSQL) of the type. To get a human-readable value for the type, use the returned OID and the field's fmod value with the format_type() SQL function:

# Get the type of the second column of the result 'res'
typename = conn.
  exec( "SELECT format_type($1,$2)", [res.ftype(1), res.fmod(1)] ).
  getvalue( 0, 0 )

Raises an ArgumentError if column_number is out of range.

static VALUE
pgresult_ftype(VALUE self, VALUE index)
{
        PGresult* result = pgresult_get(self);
        int i = NUM2INT(index);
        if (i < 0 || i >= PQnfields(result)) {
                rb_raise(rb_eArgError, "invalid field number %d", i);
        }
        return UINT2NUM(PQftype(result, i));
}
anchor
getisnull(tuple_position, field_position) → boolean

Returns true if the specified value is nil; false otherwise.

static VALUE
pgresult_getisnull(VALUE self, VALUE tup_num, VALUE field_num)
{
        PGresult *result;
        int i = NUM2INT(tup_num);
        int j = NUM2INT(field_num);

        result = pgresult_get(self);
        if (i < 0 || i >= PQntuples(result)) {
                rb_raise(rb_eArgError,"invalid tuple number %d", i);
        }
        if (j < 0 || j >= PQnfields(result)) {
                rb_raise(rb_eArgError,"invalid field number %d", j);
        }
        return PQgetisnull(result, i, j) ? Qtrue : Qfalse;
}
anchor
getlength( tup_num, field_num ) → Integer

Returns the (String) length of the field in bytes.

Equivalent to res.value(tup_num,field_num).length.

static VALUE
pgresult_getlength(VALUE self, VALUE tup_num, VALUE field_num)
{
        PGresult *result;
        int i = NUM2INT(tup_num);
        int j = NUM2INT(field_num);

        result = pgresult_get(self);
        if (i < 0 || i >= PQntuples(result)) {
                rb_raise(rb_eArgError,"invalid tuple number %d", i);
        }
        if (j < 0 || j >= PQnfields(result)) {
                rb_raise(rb_eArgError,"invalid field number %d", j);
        }
        return INT2FIX(PQgetlength(result, i, j));
}
anchor
getvalue( tup_num, field_num )

Returns the value in tuple number tup_num, field field_num, or nil if the field is NULL.

static VALUE
pgresult_getvalue(VALUE self, VALUE tup_num, VALUE field_num)
{
        t_pg_result *this = pgresult_get_this_safe(self);
        int i = NUM2INT(tup_num);
        int j = NUM2INT(field_num);

        if(i < 0 || i >= PQntuples(this->pgresult)) {
                rb_raise(rb_eArgError,"invalid tuple number %d", i);
        }
        if(j < 0 || j >= PQnfields(this->pgresult)) {
                rb_raise(rb_eArgError,"invalid field number %d", j);
        }
        return this->p_typemap->funcs.typecast_result_value(this->p_typemap, self, i, j);
}
anchor
inspect()

Return a String representation of the object suitable for debugging.

# File lib/pg/result.rb, line 19
def inspect
        str = self.to_s
        str[-1,0] = if cleared?
                " cleared"
        else
                " status=#{res_status(result_status)} ntuples=#{ntuples} nfields=#{nfields} cmd_tuples=#{cmd_tuples}"
        end
        return str
end
anchor
map_types!(type_map)

Apply a type map for all value retrieving methods.

type_map: a PG::TypeMap instance.

See PG::BasicTypeMapForResults

# File lib/pg/result.rb, line 12
def map_types!(type_map)
        self.type_map = type_map
        return self
end
anchor
nfields() → Integer

Returns the number of columns in the query result.

static VALUE
pgresult_nfields(VALUE self)
{
        return INT2NUM(PQnfields(pgresult_get(self)));
}
Also aliased as: num_fields
anchor
nparams() → Integer

Returns the number of parameters of a prepared statement. Only useful for the result returned by conn.describePrepared

static VALUE
pgresult_nparams(VALUE self)
{
        PGresult *result;

        result = pgresult_get(self);
        return INT2FIX(PQnparams(result));
}
anchor
ntuples() → Integer

Returns the number of tuples in the query result.

static VALUE
pgresult_ntuples(VALUE self)
{
        return INT2FIX(PQntuples(pgresult_get(self)));
}
Also aliased as: num_tuples
anchor
num_fields()
Alias for: nfields
anchor
num_tuples()
Alias for: ntuples
anchor
oid_value() → Integer

Returns the oid of the inserted row if applicable, otherwise nil.

static VALUE
pgresult_oid_value(VALUE self)
{
        Oid n = PQoidValue(pgresult_get(self));
        if (n == InvalidOid)
                return Qnil;
        else
                return UINT2NUM(n);
}
anchor
paramtype( param_number ) → Oid

Returns the Oid of the data type of parameter param_number. Only useful for the result returned by conn.describePrepared

static VALUE
pgresult_paramtype(VALUE self, VALUE param_number)
{
        PGresult *result;

        result = pgresult_get(self);
        return UINT2NUM(PQparamtype(result,NUM2INT(param_number)));
}
anchor
res_status( status ) → String

Returns the string representation of status status.

static VALUE
pgresult_res_status(VALUE self, VALUE status)
{
        VALUE ret = rb_tainted_str_new2(PQresStatus(NUM2INT(status)));
        PG_ENCODING_SET_NOCHECK(ret, ENCODING_GET(self));
        return ret;
}
anchor
result_error_field(p1)
Alias for: error_field
anchor
result_error_message()
Alias for: error_message
anchor
result_status() → Integer

Returns the status of the query. The status value is one of:

  • PGRES_EMPTY_QUERY

  • PGRES_COMMAND_OK

  • PGRES_TUPLES_OK

  • PGRES_COPY_OUT

  • PGRES_COPY_IN

  • PGRES_BAD_RESPONSE

  • PGRES_NONFATAL_ERROR

  • PGRES_FATAL_ERROR

  • PGRES_COPY_BOTH

static VALUE
pgresult_result_status(VALUE self)
{
        return INT2FIX(PQresultStatus(pgresult_get(self)));
}
anchor
stream_each{ |tuple| ... }

Invokes block for each tuple in the result set in single row mode.

This is a convenience method for retrieving all result tuples as they are transferred. It is an alternative to repeated calls of PG::Connection#get_result , but given that it avoids the overhead of wrapping each row into a dedicated result object, it delivers data in nearly the same speed as with ordinary results.

The base result must be in status PGRES_SINGLE_TUPLE. It iterates over all tuples until the status changes to PGRES_TUPLES_OK. A PG::Error is raised for any errors from the server.

Row description data does not change while the iteration. All value retrieval methods refer to only the current row. #ntuples returns 1 while the iteration and 0 after all tuples were yielded.

Example:

conn.send_query( "first SQL query; second SQL query" )
conn.set_single_row_mode
conn.get_result.stream_each do |row|
  # do something with each received row of the first query
end
conn.get_result.stream_each do |row|
  # do something with each received row of the second query
end
conn.get_result  # => nil   (no more results)

Available since PostgreSQL-9.2

static VALUE
pgresult_stream_each(VALUE self)
{
        return pgresult_stream_any(self, yield_hash);
}
anchor
stream_each_row { |row| ... }

Yields each row of the result set in single row mode. The row is a list of column values.

This method works equally to stream_each , but yields an Array of values.

Available since PostgreSQL-9.2

static VALUE
pgresult_stream_each_row(VALUE self)
{
        return pgresult_stream_any(self, yield_array);
}
anchor
stream_each_tuple { |tuple| ... }

Yields each row of the result set in single row mode.

This method works equally to stream_each , but yields a PG::Tuple object.

Available since PostgreSQL-9.2

static VALUE
pgresult_stream_each_tuple(VALUE self)
{
        return pgresult_stream_any(self, yield_tuple);
}
anchor
tuple( n ) → PG::Tuple

Returns a PG::Tuple from the nth row of the result.

static VALUE
pgresult_tuple(VALUE self, VALUE index)
{
        int tuple_num = NUM2INT( index );
        t_pg_result *this;
        int num_tuples;

        this = pgresult_get_this_safe(self);
        num_tuples = PQntuples(this->pgresult);

        if ( tuple_num < 0 || tuple_num >= num_tuples )
                rb_raise( rb_eIndexError, "Index %d is out of range", tuple_num );

        if( this->field_map == Qnil ){
                int i;
                VALUE field_map = rb_hash_new();

                if( this->nfields == -1 )
                        pgresult_init_fnames( self );

                for( i = 0; i < this->nfields; i++ ){
                        rb_hash_aset(field_map, this->fnames[i], INT2FIX(i));
                }
                rb_obj_freeze(field_map);
                this->field_map = field_map;
        }

  return pg_tuple_new(self, tuple_num);
}
anchor
tuple_values( n ) → array

Returns an Array of the field values from the nth row of the result.

static VALUE
pgresult_tuple_values(VALUE self, VALUE index)
{
        int tuple_num = NUM2INT( index );
        t_pg_result *this;
        int field;
        int num_tuples;
        int num_fields;

        this = pgresult_get_this_safe(self);
        num_tuples = PQntuples(this->pgresult);
        num_fields = PQnfields(this->pgresult);

        if ( tuple_num < 0 || tuple_num >= num_tuples )
                rb_raise( rb_eIndexError, "Index %d is out of range", tuple_num );

        {
                PG_VARIABLE_LENGTH_ARRAY(VALUE, row_values, num_fields, PG_MAX_COLUMNS)

                /* populate the row */
                for ( field = 0; field < num_fields; field++ ) {
                        row_values[field] = this->p_typemap->funcs.typecast_result_value(this->p_typemap, self, tuple_num, field);
                }
                return rb_ary_new4( num_fields, row_values );
        }
}
anchor
type_map → value

Returns the TypeMap that is currently set for type casts of result values to ruby objects.

static VALUE
pgresult_type_map_get(VALUE self)
{
        t_pg_result *this = pgresult_get_this(self);

        return this->typemap;
}
anchor
type_map = typemap

Set the TypeMap that is used for type casts of result values to ruby objects.

All value retrieval methods will respect the type map and will do the type casts from PostgreSQL's wire format to Ruby objects on the fly, according to the rules and decoders defined in the given typemap.

typemap must be a kind of PG::TypeMap .

static VALUE
pgresult_type_map_set(VALUE self, VALUE typemap)
{
        t_pg_result *this = pgresult_get_this(self);
        t_typemap *p_typemap;

        if ( !rb_obj_is_kind_of(typemap, rb_cTypeMap) ) {
                rb_raise( rb_eTypeError, "wrong argument type %s (expected kind of PG::TypeMap)",
                                rb_obj_classname( typemap ) );
        }
        Data_Get_Struct(typemap, t_typemap, p_typemap);

        this->typemap = p_typemap->funcs.fit_to_result( typemap, self );
        this->p_typemap = DATA_PTR( this->typemap );

        return typemap;
}
anchor
values → Array

Returns all tuples as an array of arrays.

static VALUE
pgresult_values(VALUE self)
{
        t_pg_result *this = pgresult_get_this_safe(self);
        int row;
        int field;
        int num_rows = PQntuples(this->pgresult);
        int num_fields = PQnfields(this->pgresult);
        VALUE results = rb_ary_new2( num_rows );

        for ( row = 0; row < num_rows; row++ ) {
                PG_VARIABLE_LENGTH_ARRAY(VALUE, row_values, num_fields, PG_MAX_COLUMNS)

                /* populate the row */
                for ( field = 0; field < num_fields; field++ ) {
                        row_values[field] = this->p_typemap->funcs.typecast_result_value(this->p_typemap, self, row, field);
                }
                rb_ary_store( results, row, rb_ary_new4( num_fields, row_values ) );
        }

        return results;
}