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Digg  pg_meta_data
Get meta data for table
(PHP 4 >= 4.3.0, PHP 5)
Example 1954. Getting table metadata<?phpThe above example will output: array(3) {Code Examples / Notes » pg_meta_datayarnofmoo
You can get some possibly more useful information with the query: SELECT table_name, column_name, data_type, character_maximum_length FROM information_schema.columns WHERE table_name='tablename'; rburghol
When querying on meta data from a temp table, the meta data seems to persist even if a fresh connection is established, where the temp table no longer exists. For example, if you create a connection and a temp table like so: $dbconn1 = pg_connect('blah blah', , PGSQL_CONNECT_FORCE_NEW); pg_exec($dbconn1,'create temp table foo as select 'foo' as namecol, 'bar' as valcol'); Then create a new connection $dbconn2 = pg_connect('blah blah', , PGSQL_CONNECT_FORCE_NEW); And query the meta data for table 'foo' in this new connection, it will report the facts about this table: pg_meta_data($dbconn2,'foo'); "'Array ( [foo] => Array ( [num] => 1 [type] => varchar... " However, trying to remove this table: pg_exec($dbconn,'drop table foo'); Throws an error: pg_exec(): Query failed: ERROR: table "foo" does not exist in ... dmiller
This function seems to be case-sensitive on tablename (php-4.3.1) The Array returned is of the following structure ['field name'] => Array ( ['num'] => Field number starting at 1 ['type'] => data type, eg varchar, int4 ['len'] => internal storage size of field. -1 for varying ['not null'] => boolean ['has default'] => boolean ) ...... for Varied size datatypes (varchar, text, etc) you can get the max data length from the system table pg_attribute.atttypmod -4 eg. select attnum, attname , atttypmod -4 as field_len from pg_attribute, pg_class where relname='$tablename' and attrelid=relfilenode and attnum>=1 |
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pg_affected_rows pg_cancel_query pg_client_encoding pg_close pg_connect pg_connection_busy pg_connection_reset pg_connection_status pg_convert pg_copy_from pg_copy_to pg_dbname pg_delete pg_end_copy pg_escape_bytea pg_escape_string pg_execute pg_fetch_all_columns pg_fetch_all pg_fetch_array pg_fetch_assoc pg_fetch_object pg_fetch_result pg_fetch_row pg_field_is_null pg_field_name pg_field_num pg_field_prtlen pg_field_size pg_field_table pg_field_type_oid pg_field_type pg_free_result pg_get_notify pg_get_pid pg_get_result pg_host pg_insert pg_last_error pg_last_notice pg_last_oid pg_lo_close pg_lo_create pg_lo_export pg_lo_import pg_lo_open pg_lo_read_all pg_lo_read pg_lo_seek pg_lo_tell pg_lo_unlink pg_lo_write pg_meta_data pg_num_fields pg_num_rows pg_options pg_parameter_status pg_pconnect pg_ping pg_port pg_prepare pg_put_line pg_query_params pg_query pg_result_error_field pg_result_error pg_result_seek pg_result_status pg_select pg_send_execute pg_send_prepare pg_send_query_params pg_send_query pg_set_client_encoding pg_set_error_verbosity pg_trace pg_transaction_status pg_tty pg_unescape_bytea pg_untrace pg_update pg_version |
