db2_bind_param
(PECL)
db2_bind_param --
Binds a PHP variable to an SQL statement parameter
Description
bool
db2_bind_param ( resource stmt, int parameter-number, string variable-name [, int parameter-type [, int data-type [, int precision [, int scale]]]] )
Binds a PHP variable to an SQL statement parameter in a statement resource
returned by db2_prepare(). This function gives you more
control over the parameter type, data type, precision, and scale for the
parameter than simply passing the variable as part of the optional input
array to db2_execute().
Parameters
- stmt
A prepared statement returned from db2_prepare().
- parameter-number
Specifies the 1-indexed position of the parameter in the prepared
statement.
- variable-name
A string specifying the name of the PHP variable to bind to the
parameter specified by parameter-number.
- parameter-type
A constant specifying whether the PHP variable should be bound to the
SQL parameter as an input parameter (DB2_PARAM_IN),
an output parameter (DB2_PARAM_OUT), or as a
parameter that accepts input and returns output
(DB2_PARAM_INOUT). To avoid memory overhead, you can
also specify DB2_PARAM_FILE to bind the PHP variable
to the name of a file that contains large object (BLOB, CLOB, or DBCLOB)
data.
- data-type
A constant specifying the SQL data type that the PHP variable should be
bound as: one of DB2_BINARY,
DB2_CHAR, DB2_DOUBLE, or
DB2_LONG .
- precision
Specifies the precision with which the variable should be bound to the
database.
- scale
Specifies the scale with which the variable should be bound to the
database.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example 1. Binding PHP variables to a prepared statement
The SQL statement in the following example uses two input parameters in
the WHERE clause. We call db2_bind_param() to bind two
PHP variables to the corresponding SQL parameters. Notice that the PHP
variables do not have to be declared or assigned before the call to
db2_bind_param(); in the example,
$lower_limit is assigned a value before the call to
db2_bind_param(), but $upper_limit
is assigned a value after the call to
db2_bind_param(). The variables must be bound and, for
parameters that accept input, must have any value assigned, before calling
db2_execute().
<?php
$sql = 'SELECT name, breed, weight FROM animals
WHERE weight > ? AND weight < ?';
$conn = db2_connect($database, $user, $password);
$stmt = db2_prepare($conn, $sql);
// We can declare the variable before calling db2_bind_param()
$lower_limit = 1;
db2_bind_param($stmt, 1, "lower_limit", DB2_PARAM_IN);
db2_bind_param($stmt, 2, "upper_limit", DB2_PARAM_IN);
// We can also declare the variable after calling db2_bind_param()
$upper_limit = 15.0;
if (db2_execute($stmt)) {
while ($row = db2_fetch_array($stmt)) {
print "{$row[0]}, {$row[1]}, {$row[2]}\n";
}
}
?>
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The above example will output: Pook, cat, 3.2
Rickety Ride, goat, 9.7
Peaches, dog, 12.3 |
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Example 2. Calling stored procedures with IN and OUT parameters
The stored procedure match_animal in the following example accepts
three different parameters:
an input (IN) parameter that accepts the name of the first animal as
input
an input-output (INOUT) parameter that accepts the name of the second
animal as input and returns the string TRUE if an
animal in the database matches that name
an output (OUT) parameter that returns the sum of the weight of the
two identified animals
In addition, the stored procedure returns a result set consisting of the
animals listed in alphabetic order starting at the animal corresponding
to the input value of the first parameter and ending at the animal
corresponding to the input value of the second parameter.
<?php
$sql = 'CALL match_animal(?, ?, ?)';
$conn = db2_connect($database, $user, $password);
$stmt = db2_prepare($conn, $sql);
$name = "Peaches";
$second_name = "Rickety Ride";
$weight = 0;
db2_bind_param($stmt, 1, "name", DB2_PARAM_IN);
db2_bind_param($stmt, 2, "second_name", DB2_PARAM_INOUT);
db2_bind_param($stmt, 3, "weight", DB2_PARAM_OUT);
print "Values of bound parameters _before_ CALL:\n";
print " 1: {$name} 2: {$second_name} 3: {$weight}\n\n";
if (db2_execute($stmt)) {
print "Values of bound parameters _after_ CALL:\n";
print " 1: {$name} 2: {$second_name} 3: {$weight}\n\n";
print "Results:\n";
while ($row = db2_fetch_array($stmt)) {
print " {$row[0]}, {$row[1]}, {$row[2]}\n";
}
}
?>
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The above example will output: Values of bound parameters _before_ CALL:
1: Peaches 2: Rickety Ride 3: 0
Values of bound parameters _after_ CALL:
1: Peaches 2: TRUE 3: 22
Results:
Peaches, dog, 12.3
Pook, cat, 3.2
Rickety Ride, goat, 9.7 |
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Example 3. Inserting a binary large object (BLOB) directly from a file
The data for large objects are typically stored in files, such as XML
documents or audio files. Rather than reading an entire file into a PHP
variable, and then binding that PHP variable into an SQL statement, you
can avoid some memory overhead by binding the file directly to the input
parameter of your SQL statement. The following example demonstrates how
to bind a file directly into a BLOB column.
<?php
$stmt = db2_prepare($conn, "INSERT INTO animal_pictures(picture) VALUES (?)");
$picture = "/opt/albums/spook/grooming.jpg";
$rc = db2_bind_param($stmt, 1, "picture", DB2_PARAM_FILE);
$rc = db2_execute($stmt);
?>
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