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<h1 class="topictitle1">SQLPrimaryKeys - Get primary key columns of a table</h1>
<div><div class="section"><h4 class="sectiontitle">Purpose</h4> <p><samp class="codeph">SQLPrimaryKeys()</samp> returns
a list of column names that comprise the primary key for a table. The information
is returned in an SQL result set, which can be retrieved using the same functions
that are used to process a result set that is generated by a query.</p>
</div>
<div class="section"><h4 class="sectiontitle">Syntax</h4><pre>SQLRETURN SQLPrimaryKeys (SQLHSTMT StatementHandle,
SQLCHAR *CatalogName,
SQLSMALLINT NameLength1,
SQLCHAR *SchemaName,
SQLSMALLINT NameLength2,
SQLCHAR *TableName,
SQLSMALLINT NameLength3);</pre>
</div>
<div class="section"><h4 class="sectiontitle">Function arguments</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="all"><caption>Table 1. SQLPrimaryKeys arguments</caption><thead align="left"><tr><th align="left" valign="bottom" width="20.793950850661624%" id="d0e47">Data type</th>
<th align="left" valign="bottom" width="25.330812854442343%" id="d0e49">Argument </th>
<th align="left" valign="bottom" width="10.58601134215501%" id="d0e51">Use </th>
<th align="left" valign="bottom" width="43.28922495274102%" id="d0e53">Description </th>
</tr>
</thead>
<tbody><tr><td align="left" valign="top" width="20.793950850661624%" headers="d0e47 ">SQLCHAR *</td>
<td align="left" valign="top" width="25.330812854442343%" headers="d0e49 "><em>CatalogName</em> </td>
<td align="left" valign="top" width="10.58601134215501%" headers="d0e51 ">Input </td>
<td align="left" valign="top" width="43.28922495274102%" headers="d0e53 ">Catalog qualifier of a 3 part table name.
<p> This must be a NULL pointer or a zero length string.</p>
</td>
</tr>
<tr><td align="left" valign="top" width="20.793950850661624%" headers="d0e47 ">SQLCHAR *</td>
<td align="left" valign="top" width="25.330812854442343%" headers="d0e49 "><em>SchemaName</em></td>
<td align="left" valign="top" width="10.58601134215501%" headers="d0e51 ">Input </td>
<td align="left" valign="top" width="43.28922495274102%" headers="d0e53 ">Schema qualifier of table name.</td>
</tr>
<tr><td align="left" valign="top" width="20.793950850661624%" headers="d0e47 ">SQLCHAR *</td>
<td align="left" valign="top" width="25.330812854442343%" headers="d0e49 "><em>TableName</em> </td>
<td align="left" valign="top" width="10.58601134215501%" headers="d0e51 ">Input </td>
<td align="left" valign="top" width="43.28922495274102%" headers="d0e53 ">Table name.</td>
</tr>
<tr><td align="left" valign="top" width="20.793950850661624%" headers="d0e47 ">SQLHSTMT </td>
<td align="left" valign="top" width="25.330812854442343%" headers="d0e49 "><em>StatementHandle </em></td>
<td align="left" valign="top" width="10.58601134215501%" headers="d0e51 ">Input </td>
<td align="left" valign="top" width="43.28922495274102%" headers="d0e53 ">Statement handle.</td>
</tr>
<tr><td align="left" valign="top" width="20.793950850661624%" headers="d0e47 ">SQLSMALLINT </td>
<td align="left" valign="top" width="25.330812854442343%" headers="d0e49 "><em>NameLength2</em> </td>
<td align="left" valign="top" width="10.58601134215501%" headers="d0e51 ">Input</td>
<td align="left" valign="top" width="43.28922495274102%" headers="d0e53 ">Length of <span class="synph"><span class="var">SchemaName</span>.</span></td>
</tr>
<tr><td align="left" valign="top" width="20.793950850661624%" headers="d0e47 ">SQLSMALLINT </td>
<td align="left" valign="top" width="25.330812854442343%" headers="d0e49 "><em>NameLength3</em> </td>
<td align="left" valign="top" width="10.58601134215501%" headers="d0e51 ">Input </td>
<td align="left" valign="top" width="43.28922495274102%" headers="d0e53 ">Length of <span class="synph"><span class="var">TableName</span>.</span></td>
</tr>
<tr><td align="left" valign="top" width="20.793950850661624%" headers="d0e47 ">SQLSMALLINT</td>
<td align="left" valign="top" width="25.330812854442343%" headers="d0e49 "><em>NameLength1</em> </td>
<td align="left" valign="top" width="10.58601134215501%" headers="d0e51 ">Input </td>
<td align="left" valign="top" width="43.28922495274102%" headers="d0e53 ">Length of <span class="synph"><span class="var">CatalogName</span>.</span></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section"><h4 class="sectiontitle">Usage</h4><p><samp class="codeph">SQLPrimaryKeys()</samp> returns
the primary key columns from a single table. Search patterns
cannot be used to specify the schema qualifier or the table name.</p>
<p>The
result set contains the columns that are listed in <a href="#rzadpfnpkey__tbprkey">Table 2</a>,
ordered by TABLE_CAT, TABLE_SCHEM, TABLE_NAME, and ORDINAL_POSITION.</p>
<p>Because
calls to <samp class="codeph">SQLPrimaryKeys()</samp> in many cases map to a complex
and, thus, expensive query against the system catalog, they should be used
sparingly, and the results saved rather than repeating calls.</p>
<p>Although
new columns might be added and the names of the existing columns might be
changed in future releases, the position of the current columns does not change.</p>
<div class="tablenoborder"><a name="rzadpfnpkey__tbprkey"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzadpfnpkey__tbprkey" width="100%" frame="hsides" border="1" rules="rows"><caption>Table 2. Columns returned by SQLPrimaryKeys</caption><thead align="left"><tr><th align="left" valign="bottom" width="23.00556586270872%" id="d0e174">Column number/name</th>
<th align="left" valign="bottom" width="20.037105751391465%" id="d0e176">Data type</th>
<th align="left" valign="bottom" width="56.95732838589982%" id="d0e178">Description</th>
</tr>
</thead>
<tbody><tr><td align="left" valign="top" width="23.00556586270872%" headers="d0e174 ">1  TABLE_CAT</td>
<td align="left" valign="top" width="20.037105751391465%" headers="d0e176 ">VARCHAR (128)</td>
<td align="left" valign="top" width="56.95732838589982%" headers="d0e178 ">The current server.</td>
</tr>
<tr><td align="left" valign="top" width="23.00556586270872%" headers="d0e174 ">2  TABLE_SCHEM</td>
<td align="left" valign="top" width="20.037105751391465%" headers="d0e176 ">VARCHAR (128)</td>
<td align="left" valign="top" width="56.95732838589982%" headers="d0e178 ">The name of the schema containing TABLE_NAME.</td>
</tr>
<tr><td align="left" valign="top" width="23.00556586270872%" headers="d0e174 ">3  TABLE_NAME </td>
<td align="left" valign="top" width="20.037105751391465%" headers="d0e176 ">VARCHAR (128) not NULL</td>
<td align="left" valign="top" width="56.95732838589982%" headers="d0e178 ">Name of the specified table.</td>
</tr>
<tr><td align="left" valign="top" width="23.00556586270872%" headers="d0e174 ">4  COLUMN_NAME</td>
<td align="left" valign="top" width="20.037105751391465%" headers="d0e176 ">VARCHAR (128) not NULL</td>
<td align="left" valign="top" width="56.95732838589982%" headers="d0e178 ">Primary Key column name.</td>
</tr>
<tr><td align="left" valign="top" width="23.00556586270872%" headers="d0e174 ">5  ORDINAL_POSITION </td>
<td align="left" valign="top" width="20.037105751391465%" headers="d0e176 ">SMALLINT not NULL</td>
<td align="left" valign="top" width="56.95732838589982%" headers="d0e178 ">Column sequence number in the primary key,
starting with 1.</td>
</tr>
<tr><td align="left" valign="top" width="23.00556586270872%" headers="d0e174 ">6  PK_NAME </td>
<td align="left" valign="top" width="20.037105751391465%" headers="d0e176 ">VARCHAR(128)</td>
<td align="left" valign="top" width="56.95732838589982%" headers="d0e178 ">Primary key identifier. NULL if not applicable
to the data source.</td>
</tr>
<tr><td colspan="3" align="left" valign="top" headers="d0e174 d0e176 d0e178 "> <div class="note"><span class="notetitle">Note:</span> The column
names used by DB2<sup>®</sup> UDB
CLI follow the X/Open CLI CAE specification style. The column types, contents
and order are identical to those defined for the <samp class="codeph">SQLPrimaryKeys()</samp> result
set in ODBC.</div>
</td>
</tr>
</tbody>
</table>
</div>
<p>If the specified table does not contain a primary key, an empty
result set is returned. </p>
</div>
<div class="section"><h4 class="sectiontitle">Return codes</h4><div class="p"> <ul><li>SQL_SUCCESS</li>
<li>SQL_SUCCESS_WITH_INFO</li>
<li>SQL_STILL_EXECUTING</li>
<li>SQL_ERROR</li>
<li>SQL_INVALID_HANDLE</li>
</ul>
</div>
</div>
<div class="section"><h4 class="sectiontitle">Error conditions</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="rows"><caption>Table 3. SQLPrimaryKeys SQLSTATEs</caption><thead align="left"><tr><th align="left" valign="bottom" width="12.962962962962962%" id="d0e267">SQLSTATE </th>
<th align="left" valign="bottom" width="29.074074074074076%" id="d0e269">Description </th>
<th align="left" valign="bottom" width="57.96296296296296%" id="d0e271">Explanation </th>
</tr>
</thead>
<tbody><tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>24</strong>000 </td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">Cursor state that is not valid</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">A cursor is already opened on the statement
handle.</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>40</strong>003 <strong>08</strong>S01</td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">Communication link failure</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">The communication link between the application
and data source fails before the function is completed.</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>001 </td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">Memory allocation failure</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">DB2 UDB CLI is unable to allocate memory
required to support the processing or completion of the function.</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>008</td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">Operation canceled</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">&nbsp;</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>010 </td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">Function sequence error</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">The function is called while in a data-at-processing
(<samp class="codeph">SQLParamData()</samp>, <samp class="codeph">SQLPutData()</samp>) operation.</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>014 </td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">No more handles</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">DB2 UDB CLI is unable to allocate a handle
due to internal resources.</td>
</tr>
<tr><td valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>021</td>
<td valign="top" width="29.074074074074076%" headers="d0e269 ">Internal descriptor that is not valid </td>
<td valign="top" width="57.96296296296296%" headers="d0e271 ">The internal descriptor cannot be addressed or allocated,
or it contains a value that is not valid .</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>090 </td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">String or buffer length that is not valid</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">The value of one of the name length arguments
is less than 0, but not equal to SQL_NTS.</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>C00 </td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">Driver not capable</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">DB2 UDB CLI does not support <span class="synph"><span class="var">catalog</span></span> as
a qualifier for table name.</td>
</tr>
<tr><td align="left" valign="top" width="12.962962962962962%" headers="d0e267 "><strong>HY</strong>T00</td>
<td align="left" valign="top" width="29.074074074074076%" headers="d0e269 ">Timeout expired</td>
<td align="left" valign="top" width="57.96296296296296%" headers="d0e271 ">&nbsp;</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section"><h4 class="sectiontitle">Restrictions</h4><p>None.</p>
</div>
<div class="section"><h4 class="sectiontitle">References</h4><div class="p"> <ul><li><a href="rzadpfnfkey.htm#rzadpfnfkey">SQLForeignKeys - Get the list of foreign key columns</a></li>
<li><a href="rzadpfnstats.htm#rzadpfnstats">SQLStatistics - Get index and statistics information for a base table</a></li>
</ul>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzadphdapi.htm" title="This topic provides a description of each CLI function.">DB2 UDB CLI functions</a></div>
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