03-07-2011
SQL - is it possible
I have a table with the following structure:
trxNo expiryDate remoteTrxNo
445455 2011-06-26 0
445455 2011-02-26 0
445999 2011-07-30 0
445999 2011-03-28 0
There are other columns that make the records unique but they are not relevant to my question, however, they are always in pairs.
I would like to update the remoteTrxNo in all the records in the table with the following logic:
If the expiryDate is the largest of the two possible values, write 'FAR' in the remotetrxNo column, when it is the smallest, write 'NEAR'.
Can this be done in a massive insert? Do I need to split the query in two to do the MAX once, and the MIN on the other update?
I've tried without success to write a query (or two) to accomplish this. I want to avoid writing code that will loop through a resultset one by one.
Any help would be appreciated.
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LEARN ABOUT PHP
sqlsrv_query
SQLSRV_QUERY(3) SQLSRV_QUERY(3)
sqlsrv_query - Prepares and executes a query.
SYNOPSIS
mixed sqlsrv_query (resource $conn, string $sql, [array $params], [array $options])
DESCRIPTION
Prepares and executes a query.
PARAMETERS
o $conn
- A connection resource returned by sqlsrv_connect(3).
o $sql
- The string that defines the query to be prepared and executed.
o $params
- An array specifying parameter information when executing a parameterized query. Array elements can be any of the following:
oA literal value
oA PHP variable
oAn array with this structure: array($value [, $direction [, $phpType [, $sqlType]]])
The following table describes the elements in the array structure above:
Array structure
+----------------------+---------------------------------------------------+
| Element | |
| | |
| | Description |
| | |
+----------------------+---------------------------------------------------+
| $value | |
| | |
| | A literal value, a PHP variable, or a PHP by-ref- |
| | erence variable. |
| | |
|$direction (optional) | |
| | |
| | One of the following SQLSRV constants used to |
| | indicate the parameter direction: SQL- |
| | SRV_PARAM_IN, SQLSRV_PARAM_OUT, SQL- |
| | SRV_PARAM_INOUT. The default value is SQL- |
| | SRV_PARAM_IN. |
| | |
| $phpType (optional) | |
| | |
| | A SQLSRV_PHPTYPE_* constant that specifies PHP |
| | data type of the returned value. |
| | |
| $sqlType (optional) | |
| | |
| | A SQLSRV_SQLTYPE_* constant that specifies the |
| | SQL Server data type of the input value. |
| | |
+----------------------+---------------------------------------------------+
o $options
- An array specifing query property options. The supported keys are described in the following table:
Query Options
+-----------------------+--------------------------------------+---+
| Key | | |
| | | |
| | Values | |
| | | |
| | Description | |
| | | |
+-----------------------+--------------------------------------+---+
| QueryTimeout | | |
| | | |
| | A positive integer value. | |
| | | |
| | Sets the query timeout in seconds. | |
| | By default, the driver will wait | |
| | indefinitely for results. | |
| | | |
|SendStreamParamsAtExec | | |
| | | |
| | | |
| | TRUE or FALSE (the default is TRUE) | |
| | | |
| | Configures the driver to send all | |
| | stream data at execution ( TRUE), or | |
| | to send stream data in chunks ( | |
| | FALSE). By default, the value is set | |
| | to TRUE. For more information, see | |
| | sqlsrv_send_stream_data(3). | |
| | | |
| Scrollable | | |
| | | |
| | SQLSRV_CURSOR_FORWARD, SQLSRV_CUR- | |
| | SOR_STATIC, SQLSRV_CURSOR_DYNAMIC, | |
| | or SQLSRV_CURSOR_KEYSET | |
| | | |
| | See Specifying a Cursor Type and | |
| | Selecting Rows in the Microsoft SQL- | |
| | SRV documentation. | |
| | | |
+-----------------------+--------------------------------------+---+
RETURN VALUES
Returns a statement resource on success and FALSE if an error occurred.
EXAMPLES
Example #1
sqlsrv_query(3) example
<?php
$serverName = "serverNamesqlexpress";
$connectionInfo = array( "Database"=>"dbName", "UID"=>"username", "PWD"=>"password" );
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if( $conn === false ) {
die( print_r( sqlsrv_errors(), true));
}
$sql = "INSERT INTO Table_1 (id, data) VALUES (?, ?)";
$params = array(1, "some data");
$stmt = sqlsrv_query( $conn, $sql, $params);
if( $stmt === false ) {
die( print_r( sqlsrv_errors(), true));
}
?>
NOTES
For statements that you plan to execute only once, use sqlsrv_query(3). If you intend to re-execute a statement with different parameter
values, use the combination of sqlsrv_prepare(3) and sqlsrv_execute(3).
SEE ALSO
sqlsrv_prepare(3), sqlsrv_execute(3).
PHP Documentation Group SQLSRV_QUERY(3)