cubrid_query

(PECL CUBRID >= 8.3.1)

cubrid_query — Send a CUBRID query

说明

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

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