odbc_primarykeys()

(PHP 4, PHP 5, PHP 7)

Gets the primary keys for a table

说明

odbc_primarykeys(resource $connection_id,string $qualifier,string $owner,string $table): resource

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

参数

$connection_id

ODBC 连接标识符，详见odbc_connect()。

$qualifier

$owner

$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_QUALIFIER
• TABLE_OWNER
• TABLE_NAME
• COLUMN_NAME
• KEY_SEQ
• PK_NAME

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);

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.

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.

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"];