# db2_set_option

(PECL ibm_db2 >= 1.0.0)

db2_set_option — Set options for connection or statement resources

### 说明

db2_set_option ( resource `$resource` , array `$options` , int `$type` ) : bool

Sets options for a statement resource or a connection resource. You cannot set options for result set resources.

### 参数

`resource`

  A valid statement resource as returned from db2_prepare() or a valid connection resource as returned from db2_connect() or db2_pconnect().

`options`

  An associative array containing valid statement or connection options. This parameter can be used to change autocommit values, cursor types (scrollable or forward), and to specify the case of the column names (lower, upper, or natural) that will appear in a result set.

  `autocommit`

    Passing DB2_AUTOCOMMIT_ON turns autocommit on for the specified connection resource.

    Passing DB2_AUTOCOMMIT_OFF turns autocommit off for the specified connection resource.

  `cursor`

    Passing DB2_FORWARD_ONLY specifies a forward-only cursor for a statement resource. This is the default cursor type, and is supported by all database servers.

    Passing DB2_SCROLLABLE specifies a scrollable cursor for a statement resource. Scrollable cursors enable result set rows to be accessed in non-sequential order, but are only supported by IBM DB2 Universal Database databases.

  `binmode`

    Passing DB2_BINARY specifies that binary data will be returned as is. This is the default mode. This is the equivalent of setting ibm_db2.binmode=1 in php.ini.

    Passing DB2_CONVERT specifies that binary data will be converted to hexadecimal encoding, and will be returned as such. This is the equivalent of setting ibm_db2.binmode=2 in php.ini.

    Passing DB2_PASSTHRU specifies that binary data will be converted to `NULL`. This is the equivalent of setting ibm_db2.binmode=3 in php.ini.

  `db2_attr_case`

    Passing DB2_CASE_LOWER specifies that column names of the result set are returned in lower case.

    Passing DB2_CASE_UPPER specifies that column names of the result set are returned in upper case.

    Passing DB2_CASE_NATURAL specifies that column names of the result set are returned in natural case.

  `deferred_prepare`

    Passing DB2_DEFERRED_PREPARE_ON turns deferred prepare on for the specified statement resource.

    Passing DB2_DEFERRED_PREPARE_OFF turns deferred prepare off for the specified statement resource.

  The following new i5/OS options are available in ibm_db2 version 1.5.1 and later. These options apply only when running PHP and ibm_db2 natively on i5 systems.

  `i5_fetch_only`

    DB2_I5_FETCH_ON - Cursors are read-only and cannot be used for positioned updates or deletes. This is the default unless SQL_ATTR_FOR_FETCH_ONLY environment has been set to SQL_FALSE.

    DB2_I5_FETCH_OFF - Cursors can be used for positioned updates and deletes.

  The following new option is available in ibm_db2 version 1.8.0 and later.

  `rowcount`

    DB2_ROWCOUNT_PREFETCH_ON - Client can request the full row count prior to fetching, which means that db2_num_rows() returns the number of rows selected even when a ROLLFORWARD_ONLY cursor is used.

    DB2_ROWCOUNT_PREFETCH_OFF - Client cannot request the full row count prior to fetching.

  The following new options are available in ibm_db2 version 1.7.0 and later.

  `trusted_user`

    To switch the user to a trusted user, pass the User ID (String) of the trusted user as the value of this key. This option can be set on a connection resource only. To use this option, trusted context must be enabled on the connection resource.

  `trusted_password`

    The password (String) that corresponds to the user specified by the trusted_user key.

  The following new options are available in ibm_db2 version 1.6.0 and later. These options provide useful tracking information that can be accessed during execution with db2_get_option().

  > Note:

  > When the value in each option is being set, some servers might not handle the entire length provided and might truncate the value.

  > To ensure that the data specified in each option is converted correctly when transmitted to a host system, use only the characters A through Z, 0 through 9, and the underscore (_) or period (.).

  `userid`

    SQL_ATTR_INFO_USERID - A pointer to a null-terminated character string used to identify the client user ID sent to the host database server when using DB2 Connect.

    > Note:

    > DB2 for z/OS and OS/390 servers support up to a length of 16 characters. This user-id is not to be confused with the authentication user-id, it is for identification purposes only and is not used for any authorization.

  `acctstr`

    SQL_ATTR_INFO_ACCTSTR - A pointer to a null-terminated character string used to identify the client accounting string sent to the host database server when using DB2 Connect.

    > Note:

    > DB2 for z/OS and OS/390 servers support up to a length of 200 characters.

  `applname`

    SQL_ATTR_INFO_APPLNAME - A pointer to a null-terminated character string used to identify the client application name sent to the host database server when using DB2 Connect.

    > Note:

    > DB2 for z/OS and OS/390 servers support up to a length of 32 characters.

  `wrkstnname`

    SQL_ATTR_INFO_WRKSTNNAME - A pointer to a null-terminated character string used to identify the client workstation name sent to the host database server when using DB2 Connect.

    > Note:

    > DB2 for z/OS and OS/390 servers support up to a length of 18 characters.

`type`

  An integer value that specifies the type of resource that was passed into the function. The type of resource and this value must correspond.

  Passing 1 as the value specifies that a connection resource has been passed into the function.

  Passing any integer not equal to 1 as the value specifies that a statement resource has been passed into the function.

The following table specifies which options are compatible with the available resource types:

Resource-Parameter Matrix
Key | Value | Resource Type
--- | --- | ---
|  | Connection | Statement | Result Set
autocommit | DB2_AUTOCOMMIT_ON | X | - | -
autocommit | DB2_AUTOCOMMIT_OFF | X | - | -
cursor | DB2_SCROLLABLE | - | X | -
cursor | DB2_FORWARD_ONLY | - | X | -
binmode | DB2_BINARY | X | X | -
binmode | DB2_CONVERT | X | X | -
binmode | DB2_PASSTHRU | X | X | -
db2_attr_case | DB2_CASE_LOWER | X | X | -
db2_attr_case | DB2_CASE_UPPER | X | X | -
db2_attr_case | DB2_CASE_NATURAL | X | X | -
deferred_prepare | DB2_DEFERRED_PREPARE_ON | - | X | -
deferred_prepare | DB2_DEFERRED_PREPARE_OFF | - | X | -
i5_fetch_only | DB2_I5_FETCH_ON | - | X | -
i5_fetch_only | DB2_I5_FETCH_OFF | - | X | -
rowcount | DB2_ROWCOUNT_PREFETCH_ON | - | X | -
rowcount | DB2_ROWCOUNT_PREFETCH_OFF | - | X | -
trusted_user | <USER NAME> (String) | X | - | -
trusted_password | <PASSWORD> (String) | X | - | -
userid | SQL_ATTR_INFO_USERID | X | X | -
acctstr | SQL_ATTR_INFO_ACCTSTR | X | X | -
applname | SQL_ATTR_INFO_APPLNAME | X | X | -
wrkstnname | SQL_ATTR_INFO_WRKSTNNAME | X | X | -

### 返回值

成功时返回 `TRUE`， 或者在失败时返回 `FALSE`。

### 范例

Example #1 Setting one parameter with a connection resource

    <?php
    /* Database Connection Parameters */
    $database = 'SAMPLE';
    $hostname = 'localhost';
    $port = 50000;
    $protocol = 'TCPIP';
    $username = 'db2inst1';
    $password = 'ibmdb2';

    /* Connection String */
    $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;";
    $conn_string .= "HOSTNAME=$hostname;PORT=$port;PROTOCOL=$protocol;";
    $conn_string .= "UID=$username;PWD=$password;";

    /* Obtain Connection Resource */
    $conn = db2_connect($conn_string, '', '');

    /* Create the associative options array with valid key-value pairs */
    $options = array('autocommit' => DB2_AUTOCOMMIT_ON);

    /* Call the function using the correct resource, options array, and type values */
    $result = db2_set_option($conn, $options, 1);

    /* Check if all options could be set correctly */
    if($result)
    {
      echo 'Options Set Successfully';
    }
    else
    {
      echo 'Could Not Set Options';
    }
    ?>

以上例程会输出：

    Options Set Successfully

Example #2 Setting multiple parameters with a connection resource

    <?php
    /* Database Connection Parameters */
    $database = 'SAMPLE';
    $hostname = 'localhost';
    $port = 50000;
    $protocol = 'TCPIP';
    $username = 'db2inst1';
    $password = 'ibmdb2';

    /* Connection String */
    $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;";
    $conn_string .= "HOSTNAME=$hostname;PORT=$port;PROTOCOL=$protocol;";
    $conn_string .= "UID=$username;PWD=$password;";

    /* Obtain Connection Resource */
    $conn = db2_connect($conn_string, '', '');

    /* Create the associative options array with valid key-value pairs */
    $options = array('autocommit' => DB2_AUTOCOMMIT_OFF,
                        'binmode' => DB2_PASSTHRU,
                  'db2_attr_case' => DB2_CASE_UPPER,
                         'cursor' => DB2_SCROLLABLE);

    /* Call the function using the correct resource, options array, and type values */
    $result = db2_set_option($conn, $options, 1);

    /* Check if all options could be set correctly */
    if($result)
    {
      echo 'Options Set Successfully';
    }
    else
    {
      echo 'Could Not Set Options';
    }
    ?>

以上例程会输出：

    Options Set Successfully

Example #3 Setting multiple parameters with an invalid key

    <?php
    /* Database Connection Parameters */
    $database = 'SAMPLE';
    $hostname = 'localhost';
    $port = 50000;
    $protocol = 'TCPIP';
    $username = 'db2inst1';
    $password = 'ibmdb2';

    /* Connection String */
    $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;";
    $conn_string .= "HOSTNAME=$hostname;PORT=$port;PROTOCOL=$protocol;";
    $conn_string .= "UID=$username;PWD=$password;";

    /* Obtain Connection Resource */
    $conn = db2_connect($conn_string, '', '');

    /* Create the associative options array with valid key-value pairs */
    $options = array('autocommit' => DB2_AUTOCOMMIT_OFF,
                 'MY_INVALID_KEY' => DB2_PASSTHRU,
                  'db2_attr_case' => DB2_CASE_UPPER,
                         'cursor' => DB2_SCROLLABLE);

    /* Call the function using the correct resource, options array, and type values */
    $result = db2_set_option($conn, $options, 1);

    /* Check if all options could be set correctly */
    if($result)
    {
      echo 'Options Set Successfully';
    }
    else
    {
      echo 'Could Not Set Options';
    }
    ?>

以上例程会输出：

    Could Not Set Options

Example #4 Setting multiple parameters with an invalid value

    <?php
    /* Database Connection Parameters */
    $database = 'SAMPLE';
    $hostname = 'localhost';
    $port = 50000;
    $protocol = 'TCPIP';
    $username = 'db2inst1';
    $password = 'ibmdb2';

    /* Connection String */
    $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;";
    $conn_string .= "HOSTNAME=$hostname;PORT=$port;PROTOCOL=$protocol;";
    $conn_string .= "UID=$username;PWD=$password;";

    /* Obtain Connection Resource */
    $conn = db2_connect($conn_string, '', '');

    /* Create the associative options array with valid key-value pairs */
    $options = array('autocommit' => DB2_AUTOCOMMIT_OFF,
                        'binmode' => 'INVALID_VALUE',
                  'db2_attr_case' => DB2_CASE_UPPER,
                         'cursor' => DB2_SCROLLABLE);

    /* Call the function using the correct resource, options array, and type values */
    $result = db2_set_option($conn, $options, 1);

    /* Check if all options could be set correctly */
    if($result)
    {
      echo 'Options Set Successfully';
    }
    else
    {
      echo 'Could Not Set Options';
    }
    ?>

以上例程会输出：

    Could Not Set Options

Example #5 Setting multiple parameters with a connection resource and the wrong type

    <?php
    /* Database Connection Parameters */
    $database = 'SAMPLE';
    $hostname = 'localhost';
    $port = 50000;
    $protocol = 'TCPIP';
    $username = 'db2inst1';
    $password = 'ibmdb2';

    /* Connection String */
    $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;";
    $conn_string .= "HOSTNAME=$hostname;PORT=$port;PROTOCOL=$protocol;";
    $conn_string .= "UID=$username;PWD=$password;";

    /* Obtain Connection Resource */
    $conn = db2_connect($conn_string, '', '');

    /* Create the associative options array with valid key-value pairs */
    $options = array('autocommit' => DB2_AUTOCOMMIT_OFF,
                        'binmode' => DB2_PASSTHRU,
                  'db2_attr_case' => DB2_CASE_UPPER,
                         'cursor' => DB2_SCROLLABLE);

    /* Call the function using the correct resource, options array, and the wrong type value */
    $result = db2_set_option($conn, $options, 2);

    /* Check if all options could be set correctly */
    if($result)
    {
      echo 'Options Set Successfully';
    }
    else
    {
      echo 'Could Not Set Options';
    }
    ?>

以上例程会输出：

    Could Not Set Options

Example #6 Setting multiple parameters with the wrong resource

    <?php
    /* Database Connection Parameters */
    $database = 'SAMPLE';
    $hostname = 'localhost';
    $port = 50000;
    $protocol = 'TCPIP';
    $username = 'db2inst1';
    $password = 'ibmdb2';

    /* Connection String */
    $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;";
    $conn_string .= "HOSTNAME=$hostname;PORT=$port;PROTOCOL=$protocol;";
    $conn_string .= "UID=$username;PWD=$password;";

    /* Obtain Connection Resource */
    $conn = db2_connect($conn_string, '', '');

    /* Create the associative options array with valid key-value pairs */
    $options = array('autocommit' => DB2_AUTOCOMMIT_OFF,
                        'binmode' => DB2_PASSTHRU,
                  'db2_attr_case' => DB2_CASE_UPPER,
                         'cursor' => DB2_SCROLLABLE);

    $stmt = db2_prepare($conn, 'SELECT * FROM EMPLOYEE');

    /* Call the function using the wrong resource, and the correct options array, and type values */
    $result = db2_set_option($stmt, $options, 1);

    /* Check if all options could be set correctly */
    if($result)
    {
      echo 'Options Set Successfully';
    }
    else
    {
      echo 'Could Not Set Options';
    }
    ?>

以上例程会输出：

    Could Not Set Options

Example #7 Putting it all together

    <?php
    /* Database Connection Parameters */
    $database = 'SAMPLE';
    $hostname = 'localhost';
    $port = 50000;
    $protocol = 'TCPIP';
    $username = 'db2inst1';
    $password = 'ibmdb2';

    /* Connection String */
    $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;";
    $conn_string .= "HOSTNAME=$hostname;PORT=$port;PROTOCOL=$protocol;";
    $conn_string .= "UID=$username;PWD=$password;";

    /* Obtain Connection Resource */
    $conn = db2_connect($conn_string, '', '');

    /* Create the associative options array with valid key-value pairs */
    $options = array('db2_attr_case' => DB2_CASE_LOWER,
                            'cursor' => DB2_SCROLLABLE);

    $stmt = db2_prepare($conn, 'SELECT * FROM EMPLOYEE WHERE EMPNO = ? OR EMPNO = ?');

    /* Call the function using the correct resource, options array, and type values */
    $option_result = db2_set_option($stmt, $options, 2);
    $result = db2_execute($stmt, array('000130', '000140'));

    /* Get Row 2 before Row 1 since Scrollable Cursor */
    print_r(db2_fetch_assoc($stmt, 2));
    print '<br /><br />';
    print_r(db2_fetch_assoc($stmt, 1));

    ?>

以上例程会输出：

    Array
    (
        [empno] => 000140
        [firstnme] => HEATHER
        [midinit] => A
        [lastname] => NICHOLLS
        [workdept] => C01
        [phoneno] => 1793
        [hiredate] => 1976-12-15
        [job] => ANALYST
        [edlevel] => 18
        [sex] => F
        [birthdate] => 1946-01-19
        [salary] => 28420.00
        [bonus] => 600.00
        [comm] => 2274.00
    )

    Array
    (
        [empno] => 000130
        [firstnme] => DELORES
        [midinit] => M
        [lastname] => QUINTANA
        [workdept] => C01
        [phoneno] => 4578
        [hiredate] => 1971-07-28
        [job] => ANALYST
        [edlevel] => 16
        [sex] => F
        [birthdate] => 1925-09-15
        [salary] => 23800.00
        [bonus] => 500.00
        [comm] => 1904.00
    )

Example #8 i5/OS cursors are read-only

    <?php
      $conn = db2_connect("", "", "", array("i5_lib"=>"nobody"));
      $stmt = db2_prepare($conn, 'select * from names where first = ?');
      $name = "first2";
      db2_bind_param($stmt, 1, "name", DB2_PARAM_IN);
      $options = array("i5_fetch_only"=>DB2_I5_FETCH_ON);
      db2_set_option($stmt,$options,0);
      if (db2_execute($stmt)) {
        while ($row = db2_fetch_array($stmt)) {
          echo "{$row[0]} {$row[1]}";
        }
      }
    ?>

以上例程会输出：

    first2 last2

### 参见

- db2_connect() - Returns a connection to a database
- db2_pconnect() - Returns a persistent connection to a database
- db2_exec() - Executes an SQL statement directly
- db2_prepare() - Prepares an SQL statement to be executed
- db2_cursor_type() - Returns the cursor type used by a statement resource