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List MySQL table fields
(PHP 4, PHP 5, PECL mysql:1.0)
Example 1449. Alternate to deprecated mysql_list_fields()<?phpThe above example will output something similar to: ArrayRelated Examples ( Source code ) » mysql_list_fields Examples ( Source code ) » Total number of fields in a table Code Examples / Notes » mysql_list_fieldskhashmeshab
You can use this SQL command instead of 'SHOW FIELDS FROM tablename;': 'DESC tablename;' rhyous
To make an array containing the names of a column from a table, you use the following simple script: (Note: using table1 with three columns) $qColumnNames = mysql_query("SHOW COLUMNS FROM table1",$db) or die("mysql error"); $numColumns = mysql_num_rows($qColumnNames); $x = 0; while ($x < $numColumns) { $colname = mysql_fetch_row($qColumnNames); $col[$colname[0]] = $colname[0]; $x++; } print_r($col); /* it will have the following output Array ( [firstcolumn] => firstcolumn [secondcolumn] => secondcolumn [thirdcolumn] => thirdcolumn ) */ Or you can number the columns from zero. This help when using it in conjunction with mysql_fetch_row to get an array. You don't have to remember which number of the array a certain column is. $qColumnNames = mysql_query("SHOW COLUMNS FROM table1",$db) or die("mysql error"); $numColumns = mysql_num_rows($qColumnNames); $x = 0; while ($x < $numColumns) { $colname = mysql_fetch_row($qColumnNames); $col[$colname[0]] = $x; $x++; } print_r($col); /* it will have the following output Array ( [firstcolumn] => 0 [secondcolumn] => 1 [thirdcolumn] => 2 ) */ To use it in conjuction with mysql_fetch_row: $row = mysql_fetch_row("SELECT * from table1",$db) or die("mysql error"); You can now call $row[col[firstcolumn]]. This becomes useful when you have a lot of columns. steve
Note, using mysql_list_fields will change the currently selected database so subsequent mysql_query operations will be on the database in param 1 not the one selected with mysql_select_db
dom
mysql_list_fields() retrieves information about the given table name but you can use something like mysql_fetch_field to retrieve the field names from a result source.
mbevan
If you're willing to use a lot of functions to get a little information about fields in a table, this function is for you. If you just want to get all the information you can find, you can use this: <?php // Taken from: http://ca.php.net/manual/en/function.mysql-field-flags.php // Original by: amir at scrounch dot com // Returns the name of the fields in the primary key for a table. // Also keeps the fields in KEY order. Handy. function getPrimaryKeyOf($table) { $keys = Array(); $query = sprintf("SHOW KEYS FROM `%s`", $table); $result = mysql_query($query) or die(mysql_error()); while ($row = mysql_fetch_assoc($result)) { if ( $row['Key_name'] == 'PRIMARY' ) $keys[$row['Seq_in_index'] - 1] = $row['Column_name']; } return $keys; } // Returns a bunch of information about a table... // The name of the auto-increment field, if any, fields in the // primary key (using the function above), and all information // about all fields. function getTableInformationOf($table) { $information = array( "auto" => "", "primary" => array(), "fields" => array() ); $information['primary'] = $this->getPrimaryKeyOf($table); $result = mysql_query("DESC `$table`"); while ( $field = mysql_fetch_assoc($result) ) { $information['fields'][] = $field; if ( $field['Extra'] == "auto_increment" ) $information['auto'] = $field['Field']; } return $information; } ?> harryzhong
Here is a simple script get names of columns in an array: //Get names of columns in table $field_names = array(); $res = mysql_query("SHOW COLUMNS FROM `my_table`"); for($i=0;$i<mysql_num_rows($res);$i++){ array_push($field_names,mysql_result($res, $i)); } perwool
Every my html table output begins with heading row containing the field names. For that purpose I accepted the short combination of MySQL function, giving me a result similar to the mysql_fetch_array() for the row of values. The following example shows the basic idea. It should be adapted for the specific use: <?php //... $field_names = array_keys( mysql_fetch_array( mysql_query( $query, $link), MYSQL_ASSOC)); //... ?> The advantage of this is, that it gives the names of the result, neither the field names of the whole table. Please read the discussion about duplicate field names in SQL result carefully. The use, as shown in the example above, increments the pointer, hence some regular function, which does not, could be more useful :-) Jan arster
# This should also give you an array of column names $res = mysql_query("SHOW COLUMNS FROM `my_table`"); while ($row = mysql_fetch_array($res)) $col_names[]=$row[0]; |
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