db2_lob_read

    (PECL ibm_db2 >= 1.6.0)

    db2_lob_read — Gets a user defined size of LOB files with each invocation

    说明

    db2_lob_read(resource$stmt, int$colnum, int$length): string|false

    Use db2_lob_read() to iterate through a specified column of a result set and retrieve a user defined size of LOB data.

    参数

    stmt

    A valid stmt resource containing LOB data.

    colnum

    A valid column number in the result set of the stmt resource.

    length

    The size of the LOB data to be retrieved from the stmt resource.

    返回值

    Returns the amount of data the user specifies. Returns false if the data cannot be retrieved.

    示例

    示例 #1 Iterating through different types of data

    <?php


    $db = 'SAMPLE';
    $username = 'db2inst1';
    $password = 'ibmdb2';


    $conn = db2_connect($db,$username,$password);

    if (    $conn) {
    $drop = 'DROP TABLE clob_stream';
    $result = @db2_exec( $conn, $drop );

    $create = 'CREATE TABLE clob_stream (id INTEGER, my_clob CLOB)';
    $result = db2_exec( $conn, $create );

    $variable = "";
    $stmt = db2_prepare($conn, "INSERT INTO clob_stream (id,my_clob) VALUES (1, ?)");
    $variable = "THIS IS A CLOB TEST. THIS IS A CLOB TEST.";
    db2_bind_param($stmt, 1, "variable", DB2_PARAM_IN);
    db2_execute($stmt);

    $sql = "SELECT id,my_clob FROM clob_stream";
    $result = db2_prepare($conn, $sql);
    db2_execute($result);
    db2_fetch_row($result);
    $i = 0;

    while ($data = db2_lob_read($result, 2, 6)) {
    echo     "Loop $i: $data\n";
    $i = $i + 1;
    }

    $drop = 'DROP TABLE blob_stream';
    $result = @db2_exec( $conn, $drop );

    $create = 'CREATE TABLE blob_stream (id INTEGER, my_blob CLOB)';
    $result = db2_exec( $conn, $create );

    $variable = "";
    $stmt = db2_prepare($conn, "INSERT INTO blob_stream (id,my_blob) VALUES (1, ?)");
    $variable = "THIS IS A BLOB TEST. THIS IS A BLOB TEST.";
    db2_bind_param($stmt, 1, "variable", DB2_PARAM_IN);
    db2_execute($stmt);

    $sql = "SELECT id,my_blob FROM blob_stream";
    $result = db2_prepare($conn, $sql);
    db2_execute($result);
    db2_fetch_row($result);
    $i = 0;

    while ($data = db2_lob_read($result, 2, 6)) {
    echo     "Loop $i: $data\n";
    $i = $i + 1;
    }
    } else {
    echo     'no connection: ' . db2_conn_errormsg();
    }

    ?>

    以上示例会输出：

    Loop 0: THIS I Loop 1: S A CL Loop 2: OB TES Loop 3: T. THI Loop 4: S IS A Loop 5: CLOB Loop 6: TEST. Loop 0: THIS I Loop 1: S A BL Loop 2: OB TES Loop 3: T. THI Loop 4: S IS A Loop 5: BLOB Loop 6: TEST.

    参见

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