# db2_exec

(PECL ibm_db2 >= 1.0.0)

db2_exec — Executes an SQL statement directly

### 说明

db2_exec ( resource `$connection` , string `$statement` [, array `$options` ] ) : resource

Executes an SQL statement directly.

If you plan to interpolate PHP variables into the SQL statement, understand that this is one of the more common security exposures. Consider calling db2_prepare() to prepare an SQL statement with parameter markers for input values. Then you can call db2_execute() to pass in the input values and avoid SQL injection attacks.

If you plan to repeatedly issue the same SQL statement with different parameters, consider calling db2_prepare() and db2_execute() to enable the database server to reuse its access plan and increase the efficiency of your database access.

### 参数

`connection`

  A valid database connection resource variable as returned from db2_connect() or db2_pconnect().

`statement`

  An SQL statement. The statement cannot contain any parameter markers.

`options`

  An associative array containing statement options. You can use this parameter to request a scrollable cursor on database servers that support this functionality.

  For a description of valid statement options, see db2_set_option().

### 返回值

Returns a statement resource if the SQL statement was issued successfully, or `FALSE` if the database failed to execute the SQL statement.

### 范例

Example #1 Creating a table with db2_exec()

The following example uses db2_exec() to issue a set of DDL statements in the process of creating a table.

    <?php
    $conn = db2_connect($database, $user, $password);

    // Create the test table
    $create = 'CREATE TABLE animals (id INTEGER, breed VARCHAR(32),
        name CHAR(16), weight DECIMAL(7,2))';
    $result = db2_exec($conn, $create);
    if ($result) {
        print "Successfully created the table.\n";
    }

    // Populate the test table
    $animals = array(
        array(0, 'cat', 'Pook', 3.2),
        array(1, 'dog', 'Peaches', 12.3),
        array(2, 'horse', 'Smarty', 350.0),
        array(3, 'gold fish', 'Bubbles', 0.1),
        array(4, 'budgerigar', 'Gizmo', 0.2),
        array(5, 'goat', 'Rickety Ride', 9.7),
        array(6, 'llama', 'Sweater', 150)
    );

    foreach ($animals as $animal) {
        $rc = db2_exec($conn, "INSERT INTO animals (id, breed, name, weight)
          VALUES ({$animal[0]}, '{$animal[1]}', '{$animal[2]}', {$animal[3]})");
        if ($rc) {
            print "Insert... ";
        }
    }
    ?>

以上例程会输出：

    Successfully created the table.
    Insert... Insert... Insert... Insert... Insert... Insert... Insert...

Example #2 Executing a SELECT statement with a scrollable cursor

The following example demonstrates how to request a scrollable cursor for an SQL statement issued by db2_exec().

    <?php
    $conn = db2_connect($database, $user, $password);
    $sql = "SELECT name FROM animals
        WHERE weight < 10.0
        ORDER BY name";
    if ($conn) {
        require_once('prepare.inc');
        $stmt = db2_exec($conn, $sql, array('cursor' => DB2_SCROLLABLE));
        while ($row = db2_fetch_array($stmt)) {
            print "$row[0]\n";
        }
    }
    ?>

以上例程会输出：

    Bubbles
    Gizmo
    Pook
    Rickety Ride

Example #3 Returning XML data as an SQL ResultSet

The following example demonstrates how to work with documents stored in a XML column using the SAMPLE database. Using some pretty simple SQL/XML, this example returns some of the nodes in a XML document in an SQL ResultSet format that most users are familiar with.

    <?php

    $conn = db2_connect("SAMPLE", "db2inst1", "ibmdb2");

    $query = 'SELECT * FROM XMLTABLE(
        XMLNAMESPACES (DEFAULT \'http://posample.org\'),
        \'db2-fn:xmlcolumn("CUSTOMER.INFO")/customerinfo\'
        COLUMNS
        "CID" VARCHAR (50) PATH \'@Cid\',
        "NAME" VARCHAR (50) PATH \'name\',
        "PHONE" VARCHAR (50) PATH \'phone [ @type = "work"]\'
        ) AS T
        WHERE NAME = \'Kathy Smith\'
        ';
    $stmt = db2_exec($conn, $query);

    while($row = db2_fetch_object($stmt)){
        printf("$row->CID     $row->NAME     $row->PHONE\n");
    }
    db2_close($conn);

    ?>

以上例程会输出：

    1000     Kathy Smith     416-555-1358
    1001     Kathy Smith     905-555-7258

Example #4 Performing a "JOIN" with XML data

The following example works with documents stored in 2 different XML columns in the SAMPLE database. It creates 2 temporary tables from the XML documents from 2 different columns and returns an SQL ResultSet with information regarding shipping status for the customer.

    <?php

    $conn = db2_connect("SAMPLE", "db2inst1", "ibmdb2");

    $query = '
        SELECT A.CID, A.NAME, A.PHONE, C.PONUM, C.STATUS
        FROM
        XMLTABLE(
        XMLNAMESPACES (DEFAULT \'http://posample.org\'),
        \'db2-fn:xmlcolumn("CUSTOMER.INFO")/customerinfo\'
        COLUMNS
        "CID" BIGINT PATH \'@Cid\',
        "NAME" VARCHAR (50) PATH \'name\',
        "PHONE" VARCHAR (50) PATH \'phone [ @type = "work"]\'
        ) as A,
        PURCHASEORDER AS B,
        XMLTABLE (
        XMLNAMESPACES (DEFAULT \'http://posample.org\'),
        \'db2-fn:xmlcolumn("PURCHASEORDER.PORDER")/PurchaseOrder\'
        COLUMNS
        "PONUM"  BIGINT PATH \'@PoNum\',
        "STATUS" VARCHAR (50) PATH \'@Status\'
        ) as C
        WHERE A.CID = B.CUSTID AND
        B.POID = C.PONUM AND
        A.NAME = \'Kathy Smith\'
    ';

    $stmt = db2_exec($conn, $query);

    while($row = db2_fetch_object($stmt)){
        printf("$row->CID     $row->NAME     $row->PHONE     $row->PONUM     $row->STATUS\n");
    }

    db2_close($conn);

    ?>

以上例程会输出：

    1001     Kathy Smith     905-555-7258     5002     Shipped

Example #5 Returning SQL data as part of a larger XML document

The following example works with a portion of the PRODUCT.DESCRIPTION documents in the SAMPLE database. It creates a XML document containing product description (XML data) and pricing info (SQL data).

    <?php

    $conn = db2_connect("SAMPLE", "db2inst1", "ibmdb2");

    $query = '
    SELECT
    XMLSERIALIZE(
    XMLQUERY(\'
        declare boundary-space strip;
        declare default element namespace "http://posample.org";
        <promoList> {
        for $prod in $doc/product
        where $prod/description/price < 10.00
        order by $prod/description/price ascending
        return(
            <promoitem> {
            $prod,
            <startdate> {$start} </startdate>,
            <enddate> {$end} </enddate>,
            <promoprice> {$promo} </promoprice>
            } </promoitem>
        )
        } </promoList>
    \' passing by ref DESCRIPTION AS "doc",
    PROMOSTART as "start",
    PROMOEND as "end",
    PROMOPRICE as "promo"
    RETURNING SEQUENCE)
    AS CLOB (32000))
    AS NEW_PRODUCT_INFO
    FROM PRODUCT
    WHERE PID = \'100-100-01\'
    ';

    $stmt = db2_exec($conn, $query);

    while($row = db2_fetch_array($stmt)){
        printf("$row[0]\n");
    }
    db2_close($conn);

    ?>

以上例程会输出：

    <promoList xmlns="http://posample.org">
        <promoitem>
        <product pid="100-100-01">
            <description>
                <name>Snow Shovel, Basic 22 inch</name>
                <details>Basic Snow Shovel, 22 inches wide, straight handle with D-Grip</details>
                <price>9.99</price>
                <weight>1 kg</weight>
            </description>
        </product>
        <startdate>2004-11-19</startdate>
        <enddate>2004-12-19</enddate>
        <promoprice>7.25</promoprice>
        </promoitem>
    </promoList>

### 参见

- db2_execute() - Executes a prepared SQL statement
- db2_prepare() - Prepares an SQL statement to be executed