Php/docs/function.cubrid-query
cubrid_query
(PECL CUBRID >= 8.3.1)
cubrid_query — Send a CUBRID query
说明
cubrid_query
( string $query
[, resource $conn_identifier
] ) : resource
cubrid_query() sends a unique query (multiple queries are not supported) to the
currently active database on the server that's associated with the specified conn_identifier.
参数
queryAn SQL query
Data inside the query should be properly escaped.
conn_identifierThe CUBRID connection. If the connection identifier is not specified, the last connection opened by cubrid_connect() is assumed.
返回值
For SELECT, SHOW, DESCRIBE, EXPLAIN and other statements returning resultset,
cubrid_query() returns a resource on success, or false on error.
For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc,
cubrid_query() returns true on success or false on error.
The returned result resource should be passed to cubrid_fetch_array(), and other functions for dealing with result tables, to access the returned data.
Use cubrid_num_rows() to find out how many rows were returned for a SELECT statement or cubrid_affected_rows() to find out how many rows were affected by a DELETE, INSERT, REPLACE, or UPDATE statement.
cubrid_query() will also fail and return false
if the user does not have permission to access the table(s) referenced by the query.
范例
Example #1 Invalid Query
The following query is syntactically invalid, so cubrid_query() fails and returns false.
<?php$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 $row['age'];}// Free the resources associated with the result set// This is done automatically at the end of the scriptcubrid_free_result($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
