Class: PG::Result

Inherits:
Object
  • Object
show all
Includes:
Enumerable, Constants
Defined in:
ext/pg_result.c,
lib/pg/result.rb,
ext/pg_result.c

Overview

******************************************************************

The class to represent the query result tuples (rows).
An instance of this class is created as the result of every query.
You may need to invoke the #clear method of the instance when finished with
the result for better memory performance.

Example:
   require 'pg'
   conn = PGconn.open(: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

Constant Summary

Constants included from Constants

Constants::CONNECTION_AUTH_OK, Constants::CONNECTION_AWAITING_RESPONSE, Constants::CONNECTION_BAD, Constants::CONNECTION_MADE, Constants::CONNECTION_NEEDED, Constants::CONNECTION_OK, Constants::CONNECTION_SETENV, Constants::CONNECTION_SSL_STARTUP, Constants::CONNECTION_STARTED, Constants::INVALID_OID, Constants::INV_READ, Constants::INV_WRITE, Constants::InvalidOid, Constants::PGRES_BAD_RESPONSE, Constants::PGRES_COMMAND_OK, Constants::PGRES_COPY_BOTH, Constants::PGRES_COPY_IN, Constants::PGRES_COPY_OUT, Constants::PGRES_EMPTY_QUERY, Constants::PGRES_FATAL_ERROR, Constants::PGRES_NONFATAL_ERROR, Constants::PGRES_POLLING_FAILED, Constants::PGRES_POLLING_OK, Constants::PGRES_POLLING_READING, Constants::PGRES_POLLING_WRITING, Constants::PGRES_TUPLES_OK, Constants::PG_DIAG_CONTEXT, Constants::PG_DIAG_INTERNAL_POSITION, Constants::PG_DIAG_INTERNAL_QUERY, Constants::PG_DIAG_MESSAGE_DETAIL, Constants::PG_DIAG_MESSAGE_HINT, Constants::PG_DIAG_MESSAGE_PRIMARY, Constants::PG_DIAG_SEVERITY, Constants::PG_DIAG_SOURCE_FILE, Constants::PG_DIAG_SOURCE_FUNCTION, Constants::PG_DIAG_SOURCE_LINE, Constants::PG_DIAG_SQLSTATE, Constants::PG_DIAG_STATEMENT_POSITION, Constants::PQERRORS_DEFAULT, Constants::PQERRORS_TERSE, Constants::PQERRORS_VERBOSE, Constants::PQPING_NO_ATTEMPT, Constants::PQPING_NO_RESPONSE, Constants::PQPING_OK, Constants::PQPING_REJECT, Constants::PQTRANS_ACTIVE, Constants::PQTRANS_IDLE, Constants::PQTRANS_INERROR, Constants::PQTRANS_INTRANS, Constants::PQTRANS_UNKNOWN, Constants::SEEK_CUR, Constants::SEEK_END, Constants::SEEK_SET

Instance Method Summary collapse

Instance Method Details

#[](n) ⇒ Hash

Returns tuple n as a hash.

Returns:

  • (Hash) 


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# File 'ext/pg_result.c', line 675

static VALUE
pgresult_aref(VALUE self, VALUE index)
{
	PGresult *result = pgresult_get(self);
	int tuple_num = NUM2INT(index);
	int field_num;
	VALUE fname,val;
	VALUE tuple;

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

	tuple = rb_hash_new();
	for ( field_num = 0; field_num < PQnfields(result); field_num++ ) {
		fname = rb_tainted_str_new2( PQfname(result,field_num) );
		ASSOCIATE_INDEX(fname, self);
		if ( PQgetisnull(result, tuple_num, field_num) ) {
			rb_hash_aset( tuple, fname, Qnil );
		}
		else {
			val = rb_tainted_str_new( PQgetvalue(result, tuple_num, field_num ),
			                          PQgetlength(result, tuple_num, field_num) );

#ifdef M17N_SUPPORTED
			/* associate client encoding for text format only */
			if ( 0 == PQfformat(result, field_num) ) {
				ASSOCIATE_INDEX( val, self );
			} else {
				rb_enc_associate( val, rb_ascii8bit_encoding() );
			}
#endif

			rb_hash_aset( tuple, fname, val );
		}
	}
	return tuple;
}

#result ⇒ nil Also known as: check_result

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

Returns:

  • (nil) 


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# File 'ext/pg_result.c', line 44

VALUE
pg_result_check( VALUE self )
{
	VALUE error, exception;
	VALUE rb_pgconn = rb_iv_get( self, "@connection" );
	PGconn *conn = pg_get_pgconn(rb_pgconn);
	PGresult *result;
#ifdef M17N_SUPPORTED
	rb_encoding *enc = pg_conn_enc_get( conn );
#endif

	Data_Get_Struct(self, PGresult, result);

	if(result == NULL)
	{
		error = rb_str_new2( PQerrorMessage(conn) );
	}
	else
	{
		switch (PQresultStatus(result))
		{
		case PGRES_TUPLES_OK:
		case PGRES_COPY_OUT:
		case PGRES_COPY_IN:
#ifdef HAVE_CONST_PGRES_COPY_BOTH
		case PGRES_COPY_BOTH:
#endif
		case PGRES_EMPTY_QUERY:
		case PGRES_COMMAND_OK:
			return Qnil;
		case PGRES_BAD_RESPONSE:
		case PGRES_FATAL_ERROR:
		case PGRES_NONFATAL_ERROR:
			error = rb_str_new2( PQresultErrorMessage(result) );
			break;
		default:
			error = rb_str_new2( "internal error : unknown result status." );
		}
	}

#ifdef M17N_SUPPORTED
	rb_enc_set_index( error, rb_enc_to_index(enc) );
#endif
	exception = rb_exc_new3( rb_ePGerror, error );
	rb_iv_set( exception, "@connection", rb_pgconn );
	rb_iv_set( exception, "@result", self );
	rb_exc_raise( exception );

	/* Not reached */
	return Qnil;
}

#clear ⇒ nil

Clears the PG::Result object as the result of the query.

Returns:

  • (nil) 


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# File 'ext/pg_result.c', line 109

VALUE
pg_result_clear(VALUE self)
{
	PQclear(pgresult_get(self));
	DATA_PTR(self) = NULL;
	return Qnil;
}

#cmd_status ⇒ String

Returns the status string of the last query command.

Returns:

  • (String) 


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# File 'ext/pg_result.c', line 620

static VALUE
pgresult_cmd_status(VALUE self)
{
	VALUE ret = rb_tainted_str_new2(PQcmdStatus(pgresult_get(self)));
	ASSOCIATE_INDEX(ret, self);
	return ret;
}

#cmd_tuples ⇒ Fixnum Also known as: cmdtuples

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

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

  • INSERT

  • UPDATE

  • DELETE

  • MOVE

  • FETCH

or if no tuples were affected, 0 is returned.

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 642

static VALUE
pgresult_cmd_tuples(VALUE self)
{
	long n;
	n = strtol(PQcmdTuples(pgresult_get(self)),NULL, 10);
	return INT2NUM(n);
}

#column_values(n) ⇒ Array

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

Returns:

  • (Array) 


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# File 'ext/pg_result.c', line 805

static VALUE
pgresult_column_values(VALUE self, VALUE index)
{
	int col = NUM2INT( index );
	return make_column_result_array( self, col );
}

#each {|tuple| ... } ⇒ Object

Invokes block for each tuple in the result set.

Yields:

  • (tuple) 


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# File 'ext/pg_result.c', line 840

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

	for(tuple_num = 0; tuple_num < PQntuples(result); tuple_num++) {
		rb_yield(pgresult_aref(self, INT2NUM(tuple_num)));
	}
	return self;
}

#error_field(fieldcode) ⇒ String Also known as: result_error_field

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 [
        result.error_field( PG::Result::PG_DIAG_SEVERITY ),
        result.error_field( PG::Result::PG_DIAG_SQLSTATE ),
        result.error_field( PG::Result::PG_DIAG_MESSAGE_PRIMARY ),
        result.error_field( PG::Result::PG_DIAG_MESSAGE_DETAIL ),
        result.error_field( PG::Result::PG_DIAG_MESSAGE_HINT ),
        result.error_field( PG::Result::PG_DIAG_STATEMENT_POSITION ),
        result.error_field( PG::Result::PG_DIAG_INTERNAL_POSITION ),
        result.error_field( PG::Result::PG_DIAG_INTERNAL_QUERY ),
        result.error_field( PG::Result::PG_DIAG_CONTEXT ),
        result.error_field( PG::Result::PG_DIAG_SOURCE_FILE ),
        result.error_field( PG::Result::PG_DIAG_SOURCE_LINE ),
        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"]

Returns:

  • (String) 


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# File 'ext/pg_result.c', line 264

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 );
		ASSOCIATE_INDEX( ret, self );
	}

	return ret;
}

#error_message ⇒ String Also known as: result_error_message

Returns the error message of the command as a string.

Returns:

  • (String) 


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# File 'ext/pg_result.c', line 210

static VALUE
pgresult_error_message(VALUE self)
{
	VALUE ret = rb_tainted_str_new2(PQresultErrorMessage(pgresult_get(self)));
	ASSOCIATE_INDEX(ret, self);
	return ret;
}

#fformat(column_number) ⇒ Fixnum

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

Raises ArgumentError if column_number is out of range.

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 407

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));
}

#field_values(field) ⇒ Array

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

Returns:

  • (Array) 


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# File 'ext/pg_result.c', line 820

static VALUE
pgresult_field_values( VALUE self, VALUE field )
{
	PGresult *result = pgresult_get( self );
	const char *fieldname = RSTRING_PTR( 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 );
}

#fields ⇒ Array

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

Returns:

  • (Array) 


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# File 'ext/pg_result.c', line 858

static VALUE
pgresult_fields(VALUE self)
{
	PGresult *result = pgresult_get( self );
	int n = PQnfields( result );
	VALUE fields[ n ];
	int i;

	for ( i = 0; i < n; i++ ) {
		VALUE val = rb_tainted_str_new2(PQfname(result, i));
		ASSOCIATE_INDEX(val, self);
		fields[ i ] = val;
	}

	return rb_ary_new4( n, fields );
}

#fmod(column_number) ⇒ Object

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.



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# File 'ext/pg_result.c', line 457

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);
}

#fname(index) ⇒ String

Returns the name of the column corresponding to index.

Returns:

  • (String) 


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# File 'ext/pg_result.c', line 310

static VALUE
pgresult_fname(VALUE self, VALUE index)
{
	VALUE fname;
	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);
	}
	fname = rb_tainted_str_new2(PQfname(result, i));
	ASSOCIATE_INDEX(fname, self);
	return fname;
}

#fnumber(name) ⇒ Fixnum

Returns the index of the field specified by the string name.

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

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 335

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

	Check_Type(name, T_STRING);

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

#fsize(index) ⇒ Object

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



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# File 'ext/pg_result.c', line 482

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));
}

#ftable(column_number) ⇒ Fixnum

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.

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 359

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 INT2FIX(n);
}

#ftablecol(column_number) ⇒ Fixnum

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.

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 383

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);
}

#ftype(column_number) ⇒ Object

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.



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# File 'ext/pg_result.c', line 437

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 INT2NUM(PQftype(result, i));
}

#getisnull(tuple_position, field_position) ⇒ Boolean

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

Returns:

  • (Boolean) 


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# File 'ext/pg_result.c', line 540

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;
}

#getlength(tup_num, field_num) ⇒ Fixnum

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

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

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 565

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));
}

#getvalue(tup_num, field_num) ⇒ Object

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



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# File 'ext/pg_result.c', line 502

static VALUE
pgresult_getvalue(VALUE self, VALUE tup_num, VALUE field_num)
{
	VALUE val;
	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);
	}
	if(PQgetisnull(result, i, j))
		return Qnil;
	val = rb_tainted_str_new(PQgetvalue(result, i, j),
				PQgetlength(result, i, j));

#ifdef M17N_SUPPORTED
	/* associate client encoding for text format only */
	if ( 0 == PQfformat(result, j) ) {
		ASSOCIATE_INDEX( val, self );
	} else {
		rb_enc_associate( val, rb_ascii8bit_encoding() );
	}
#endif

	return val;
}

#nfields ⇒ Fixnum Also known as: num_fields

Returns the number of columns in the query result.

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 298

static VALUE
pgresult_nfields(VALUE self)
{
	return INT2NUM(PQnfields(pgresult_get(self)));
}

#nparams ⇒ Fixnum

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

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 589

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

	result = pgresult_get(self);
	return INT2FIX(PQnparams(result));
}

#ntuples ⇒ Fixnum Also known as: num_tuples

Returns the number of tuples in the query result.

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 286

static VALUE
pgresult_ntuples(VALUE self)
{
	return INT2FIX(PQntuples(pgresult_get(self)));
}

#oid_value ⇒ Fixnum

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

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 657

static VALUE
pgresult_oid_value(VALUE self)
{
	Oid n = PQoidValue(pgresult_get(self));
	if (n == InvalidOid)
		return Qnil;
	else
		return INT2FIX(n);
}

#paramtype(param_number) ⇒ Oid

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

Returns:

  • (Oid) 


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# File 'ext/pg_result.c', line 605

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

	result = pgresult_get(self);
	return INT2FIX(PQparamtype(result,NUM2INT(param_number)));
}

#res_status(status) ⇒ String

Returns the string representation of status status.

Returns:

  • (String) 


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# File 'ext/pg_result.c', line 196

static VALUE
pgresult_res_status(VALUE self, VALUE status)
{
	VALUE ret = rb_tainted_str_new2(PQresStatus(NUM2INT(status)));
	ASSOCIATE_INDEX(ret, self);
	return ret;
}

#result_status ⇒ Fixnum

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

Returns:

  • (Fixnum) 


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# File 'ext/pg_result.c', line 183

static VALUE
pgresult_result_status(VALUE self)
{
	return INT2FIX(PQresultStatus(pgresult_get(self)));
}

#values ⇒ Array

Returns all tuples as an array of arrays.

Returns:

  • (Array) 


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# File 'ext/pg_result.c', line 720

static VALUE
pgresult_values(VALUE self)
{
	PGresult* result = (PGresult*) pgresult_get(self);
	int row;
	int field;
	int num_rows = PQntuples(result);
	int num_fields = PQnfields(result);
	VALUE rows[ num_rows ];

	for ( row = 0; row < num_rows; row++ ) {
		VALUE new_row[ num_fields ];

		/* populate the row */
		for ( field = 0; field < num_fields; field++ ) {
			if ( PQgetisnull(result, row, field) ) {
				new_row[ field ] = Qnil;
			}
			else {
				VALUE val = rb_tainted_str_new( PQgetvalue(result, row, field), 
				                                PQgetlength(result, row, field) );

#ifdef M17N_SUPPORTED
				/* associate client encoding for text format only */
				if ( 0 == PQfformat(result, field) ) {
					ASSOCIATE_INDEX( val, self );
				} else {
					rb_enc_associate( val, rb_ascii8bit_encoding() );
				}
#endif
				new_row[ field ] = val;
			}
		}

		rows[ row ] = rb_ary_new4( num_fields, new_row );
	}

	return rb_ary_new4( num_rows, rows );
}