PHP CUBRID MySQL 兼容性函数 Send a CUBRID query

说明

cubrid_query ( string $query [, resource $conn_identifier ] ) : resource

cubrid_query() sends a unique query (multiple queries are not supported) to the currently active database on the server that's associated with the specified conn_identifier.

参数

query

An SQL query

Data inside the query should be properly escaped.

conn_identifier

The CUBRID connection. If the connection identifier is not specified, the last connection opened by cubrid_connect() is assumed.

返回值

For SELECT, SHOW, DESCRIBE, EXPLAIN and other statements returning resultset, cubrid_query() returns a resource on success, or FALSE on error.

For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc, cubrid_query() returns TRUE on success or FALSE on error.

The returned result resource should be passed to cubrid_fetch_array(), and other functions for dealing with result tables, to access the returned data.

Use cubrid_num_rows() to find out how many rows were returned for a SELECT statement or cubrid_affected_rows() to find out how many rows were affected by a DELETE, INSERT, REPLACE, or UPDATE statement.

cubrid_query() will also fail and return FALSE if the user does not have permission to access the table(s) referenced by the query.

范例

Example #1 Invalid Query

The following query is syntactically invalid, so cubrid_query() fails and returns FALSE.

 <?php
$conn = cubrid_connect('localhost', 33000, 'demodb');

$result = cubrid_query('SELECT * WHERE 1=1');
if (!$result) {
    die('Invalid query: ' . cubrid_error());
}

?>

Example #2 Valid Query

The following query is valid, so cubrid_query() returns a resource.

 <?php
// This could be supplied by a user, for example
$firstname = 'fred';
$lastname  = 'fox';

$conn = cubrid_connect('localhost', 33000, 'demodb');

cubrid_execute($conn,"DROP TABLE if exists friends");
cubrid_execute($conn,"create table friends(firstname varchar,lastname varchar,address char(24),age int)");
cubrid_execute($conn,"insert into friends values('fred','fox','home-1','20')");
cubrid_execute($conn,"insert into friends values('blue','cat','home-2','21')");
// Formulate Query
// This is the best way to perform an SQL query
// For more examples, see cubrid_real_escape_string()
$query = sprintf("SELECT firstname, lastname, address, age FROM friends WHERE firstname='%s' AND lastname='%s'",
cubrid_real_escape_string($firstname),
cubrid_real_escape_string($lastname));

// Perform Query
$result = cubrid_query($query);

// Check result
// This shows the actual query sent to CUBRID, and the error. Useful for debugging.
if (!$result) {
    $message  = 'Invalid query: ' . cubrid_error() . "\n";
    $message .= 'Whole query: ' . $query;
    die($message);
}

// Use result
// Attempting to print $result won't allow access to information in the resource
// One of the cubrid result functions must be used
// See also cubrid_result(), cubrid_fetch_array(), cubrid_fetch_row(), etc.
while ($row = cubrid_fetch_assoc($result)) {
    echo $row['firstname'];
    echo $row['lastname'];
    echo $row['address'];
    echo $row['age'];
}

// Free the resources associated with the result set
// This is done automatically at the end of the script
cubrid_free_result($result);
?>

参见

cubrid_connect() - Open a connection to a CUBRID Server
cubrid_error() - Get the error message
cubrid_real_escape_string() - Escape special characters in a string for use in an SQL statement
cubrid_result() - Return the value of a specific field in a specific row
cubrid_fetch_assoc() - Return the associative array that corresponds to the fetched row
cubrid_unbuffered_query() - Perform a query without fetching the results into memory