php-doc-en/reference/pdo_sqlsrv/constants.xml

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<section xml:id="pdo-sqlsrv.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.constants;
 &pdo.driver-constants;
 <variablelist>
  <varlistentry xml:id="pdo.constants.sqlsrv-txn-read-uncommitted">
   <term>
    <constant>PDO::SQLSRV_TXN_READ_UNCOMMITTED</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     This constant is an acceptable value for the SQLSRV DSN key TransactionIsolation. 
     This constant sets the transaction isolation level for the connection to 
     Read Uncommitted.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-txn-read-committed">
   <term>
    <constant>PDO::SQLSRV_TXN_READ_COMMITTED</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     This constant is an acceptable value for the SQLSRV DSN key TransactionIsolation. 
     This constant sets the transaction isolation level for the connection to 
     Read Committed.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-txn-repeatable-read">
   <term>
    <constant>PDO::SQLSRV_TXN_REPEATABLE_READ</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     This constant is an acceptable value for the SQLSRV DSN key TransactionIsolation. 
     This constant sets the transaction isolation level for the connection to 
     Repeateable Read.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-txn-snapshot">
   <term>
    <constant>PDO::SQLSRV_TXN_SNAPSHOT</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     This constant is an acceptable value for the SQLSRV DSN key TransactionIsolation. 
     This constant sets the transaction isolation level for the connection to Snapshot.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-txn-serializable">
   <term>
    <constant>PDO::SQLSRV_TXN_SERIALIZABLE</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     This constant is an acceptable value for the SQLSRV DSN key TransactionIsolation. 
     This constant sets the transaction isolation level for the connection to 
     Serializable.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-encoding-binary">
   <term>
    <constant>PDO::SQLSRV_ENCODING_BINARY</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     Specifies that data is sent/retrieved as a raw byte stream to/from the server 
     without performing encoding or translation. This constant can be passed to 
     PDOStatement::setAttribute, PDO::prepare, PDOStatement::bindColumn, and 
     PDOStatement::bindParam.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-encoding-system">
   <term>
    <constant>PDO::SQLSRV_ENCODING_SYSTEM</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     Specifies that data is sent/retrieved to/from the server as 8-bit characters 
     as specified in the code page of the Windows locale that is set on the system. 
     Any multi-byte characters or characters that do not map into this code page 
     are substituted with a single byte question mark (?) character. This constant 
     can be passed to PDOStatement::setAttribute, PDO::setAttribute, PDO::prepare, 
     PDOStatement::bindColumn, and PDOStatement::bindParam.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-encoding-utf8">
   <term>
    <constant>PDO::SQLSRV_ENCODING_UTF8</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     Specifies that data is sent/retrieved to/from the server in UTF-8 encoding. 
     This is the default encoding. This constant can be passed to 
     PDOStatement::setAttribute, PDO::setAttribute, PDO::prepare, 
     PDOStatement::bindColumn, and PDOStatement::bindParam.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-encoding-default">
   <term>
    <constant>PDO::SQLSRV_ENCODING_DEFAULT</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     Specifies that data is sent/retrieved to/from the server according to 
     PDO::SQLSRV_ENCODING_SYSTEM if specified during connection. The connection's 
     encoding is used if specified in a prepare statement. This constant can be 
     passed to PDOStatement::setAttribute, PDO::setAttribute, PDO::prepare, 
     PDOStatement::bindColumn, and PDOStatement::bindParam.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-attr-query-timeout">
   <term>
    <constant>PDO::SQLSRV_ATTR_QUERY_TIMEOUT</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     A non-negative integer representing the timeout period, in seconds. Zero (0) 
     is the default and means no timeout. This constant can be passed to 
     PDOStatement::setAttribute, PDO::setAttribute, and PDO::prepare.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="pdo.constants.sqlsrv-attr-direct-query">
   <term>
    <constant>PDO::SQLSRV_ATTR_DIRECT_QUERY</constant>
     (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     Indicates that a query should be executed directly, without being prepared. 
     This constant can be passed to PDO::setAttribute, and PDO::prepare. For more 
     information, see 
     <link xlink:href="&url.sqlsrv.direct.execution;">Direct and Prepared Statement Execution</link>.
    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
</section>

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