# 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

`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