odbc_primarykeys

(PHP 4, PHP 5, PHP 7, PHP 8)

odbc_primarykeys — Gets the primary keys for a table

说明

odbc_primarykeys ( resource $odbc , string|null $catalog , string $schema , string $table ) : resource|false

Returns a result identifier that can be used to fetch the column names that comprise the primary key for a table.

参数

odbc: ODBC 连接标识符，详见 odbc_connect()。
catalog: The catalog ('qualifier' in ODBC 2 parlance).
schema: The schema ('owner' in ODBC 2 parlance).
table

返回值

Returns an ODBC result identifier 或者在失败时返回 false.

The result set has the following columns:

TABLE_CAT
TABLE_SCHEM
TABLE_NAME
COLUMN_NAME
KEY_SEQ
PK_NAME

Drivers can report additional columns.

The result set is ordered by TABLE_CAT, TABLE_SCHEM, TABLE_NAME and KEY_SEQ.

范例

Example #1 List primary Keys of a Column


<?php
$conn = odbc_connect($dsn, $user, $pass);
$primarykeys = odbc_primarykeys($conn, 'TutorialDB', 'dbo', 'TEST');
while (($row = odbc_fetch_array($primarykeys))) {
    print_r($row);
    break; // further rows omitted for brevity
}
?>

以上例程的输出类似于：

Array
(
    [TABLE_CAT] => TutorialDB
    [TABLE_SCHEM] => dbo
    [TABLE_NAME] => TEST
    [COLUMN_NAME] => id
    [KEY_SEQ] => 1
    [PK_NAME] => PK__TEST__3213E83FE141F843
)

参见

odbc_tables() - Get the list of table names stored in a specific data source
odbc_foreignkeys() - Retrieves a list of foreign keys

User Contributed Notes

ewilde aht bsmdevelopment dawt com 11-Jul-2006 03:39


I was trying to find the primary keys from an SQLServer database through the ODBC interface.  Funnily enough, the odbc_primarykeys function doesn't work with SQLServer (at least not my implementation of it).  Fortunately, the sp_keys query is passed through and the answer returned.  This code works (providing you know which database you're dealing with, which is a whole 'nother story).



// If this is SQLServer, we need to do a special operation to get the

// primary keys.

//

// Looks like the implementers of the ODBC interface just blew this

// one off, since the database has a query to return the info and the

// info even comes back with the same column names.

if ($DBType == "SQLServer")

  $KeySel = odbc_exec($DBConn, "sp_pkeys ".$TableName);



// Otherwise, ask the database through ODBC for the primary key

// names.

else $KeySel = odbc_primarykeys($DBConn, $DatabaseName,

  $DatabaseUser, $TableName);



while ($KeySel && ($KeyRec = odbc_fetch_array($KeySel)))

  $KeyCol[$KeyRec["KEY_SEQ"]] = $KeyRec["COLUMN_NAME"];

dan dot scott at ca dot ibm dot com 20-Dec-2004 07:51


Responding to devendra_joshi:



In DB2 Universal Database for Linux, UNIX, and Windows the catalog views are accessed through the SYSCAT schema, not the SYSIBM schema -- so you should be issuing "SELECT * FROM SYSCAT.KEYCOLUSE" to list all of the columns that participate in a given key constraint.



A complete list of the catalog views for DB2 can be referenced at http://publib.boulder.ibm.com/infocenter/db2help/ by searching for 'catalog views' and selecting the top hit.

Rio Bautista (RRIT) 20-Feb-2004 08:08


Sample to get the primary keys of an MSSQL table:



$cn = odbc_connect( "DSN", "sa", "pwd");



$rs = odbc_primarykeys( $cn, "database", "dbo", "table_name"); 



odbc_result_all($rs);

devendra_joshi at hotmail dot com 11-Jul-2003 02:52


I want a list of primary keys of a table in db2



by using 

'select * from SYSIBM.SYSKEYCOLUSE ' query i am getting the result on CLP

but when i am writing it in PHP as follows it returns 0 ROWS.



$mstmt="select * from SYSIBM.SYSKEYCOLUSE";

$b=odbc_exec($conn,$mstmt);

echo odbc_result_all($b);



where as  if we write this code



$mstmt="select * from SYSIBM.SYSFUNCTIONS";

$b=odbc_exec($conn,$mstmt);

echo odbc_result_all($b);



it returns the correct data.