dbx_query

(PHP 4 >= 4.0.6, PHP 5 < 5.1.0, PECL dbx >= 1.1.0)

dbx_querySend a query and fetch all results (if any)

说明

dbx_query ( object $link_identifier , string $sql_statement [, int $flags ] ) : mixed

Sends a query and fetch all results.

参数

link_identifier

The DBX link object returned by dbx_connect()

sql_statement

SQL statement.

Data inside the query should be properly escaped.

flags

The flags parameter is used to control the amount of information that is returned. It may be any combination of the following constants with the bitwise OR operator (|). The DBX_COLNAMES_* flags override the dbx.colnames_case setting from php.ini.

DBX_RESULT_INDEX
It is always set, that is, the returned object has a data property which is a 2 dimensional array indexed numerically. For example, in the expression data[2][3] 2 stands for the row (or record) number and 3 stands for the column (or field) number. The first row and column are indexed at 0. If DBX_RESULT_ASSOC is also specified, the returning object contains the information related to DBX_RESULT_INFO too, even if it was not specified.
DBX_RESULT_INFO
It provides info about columns, such as field names and field types.
DBX_RESULT_ASSOC
It effects that the field values can be accessed with the respective column names used as keys to the returned object's data property. Associated results are actually references to the numerically indexed data, so modifying data[0][0] causes that data[0]['field_name_for_first_column'] is modified as well.
DBX_RESULT_UNBUFFERED
This flag will not create the data property, and the rows property will initially be 0. Use this flag for large datasets, and use dbx_fetch_row() to retrieve the results row by row. The dbx_fetch_row() function will return rows that are conformant to the flags set with this query. Incidentally, it will also update the rows each time it is called.
DBX_COLNAMES_UNCHANGED
The case of the returned column names will not be changed.
DBX_COLNAMES_UPPERCASE
The case of the returned column names will be changed to uppercase.
DBX_COLNAMES_LOWERCASE
The case of the returned column names will be changed to lowercase.
Note that DBX_RESULT_INDEX is always used, regardless of the actual value of flags parameter. This means that only the following combinations are effective:
  • DBX_RESULT_INDEX
  • DBX_RESULT_INDEX | DBX_RESULT_INFO
  • DBX_RESULT_INDEX | DBX_RESULT_INFO | DBX_RESULT_ASSOC - this is the default, if flags is not specified.

返回值

dbx_query() returns an object or 1 on success, and 0 on failure. The result object is returned only if the query given in sql_statement produces a result set (i.e. a SELECT query, even if the result set is empty).

The returned object has four or five properties depending on flags:

handle

It is a valid handle for the connected database, and as such it can be used in module specific functions (if required).

<?php
$result 
dbx_query($link"SELECT id FROM table");
mysql_field_len($result->handle0);
?>

cols and rows

These contain the number of columns (or fields) and rows (or records) respectively.

<?php
$result 
dbx_query($link'SELECT id FROM table');
echo 
$result->rows// number of records
echo $result->cols// number of fields 
?>

info (optional)
It is returned only if either DBX_RESULT_INFO or DBX_RESULT_ASSOC is specified in the flags parameter. It is a 2 dimensional array, that has two named rows (name and type) to retrieve column information.

Example #1 lists each field's name and type

<?php
$result 
dbx_query($link'SELECT id FROM table',
                     
DBX_RESULT_INDEX DBX_RESULT_INFO);

for (
$i 0$i $result->cols$i++ ) {
    echo 
$result->info['name'][$i] . "\n";
    echo 
$result->info['type'][$i] . "\n";  
}
?>
data
This property contains the actual resulting data, possibly associated with column names as well depending on flags. If DBX_RESULT_ASSOC is set, it is possible to use $result->data[2]["field_name"].

Example #2 outputs the content of data property into HTML table

<?php
$result 
dbx_query($link'SELECT id, parentid, description FROM table');

echo 
"<table>\n";
foreach (
$result->data as $row) {
    echo 
"<tr>\n";
    foreach (
$row as $field) {
        echo 
"<td>$field</td>";
    }
    echo 
"</tr>\n";
}
echo 
"</table>\n";
?>

Example #3 How to handle UNBUFFERED queries

<?php

$result 
dbx_query ($link'SELECT id, parentid, description FROM table'DBX_RESULT_UNBUFFERED);

echo 
"<table>\n";
while (
$row dbx_fetch_row($result)) {
    echo 
"<tr>\n";
    foreach (
$row as $field) {
        echo 
"<td>$field</td>";
    }
    echo 
"</tr>\n";
}
echo 
"</table>\n";

?>

更新日志

版本 说明
5.0.0 Introduced DBX_RESULT_UNBUFFERED.
4.3.0 Introduced DBX_COLNAMES_UNCHANGED, DBX_COLNAMES_UPPERCASE, and DBX_COLNAMES_LOWERCASE.

范例

Example #4 How to handle the returned value

<?php
$link   
dbx_connect(DBX_ODBC"""db""username""password")
    or die(
"Could not connect");

$result dbx_query($link'SELECT id, parentid, description FROM table');

if (
is_object($result) ) {
    
// ... do some stuff here, see detailed examples below ...
    // first, print out field names and types 
    // then, draw a table filled with the returned field values
} else {
    exit(
"Query failed");
}

dbx_close($link);
?>

注释

Note:

Always refer to the module-specific documentation as well.

Column names for queries on an Oracle database are returned in lowercase.

参见

相关文章
php cubrid mysql 兼容性函数 send a cubrid queryphp cubrid mysql 兼容性函数 perform a query without fetching the results into memoryphp dbx 函数 send a query and fetch all results if any php enchant 函数 will return a list of values if any of those pre conditions are not metphp frontbase 函数 send a frontbase queryphp frontbase 函数 send a frontbase queryphp informix 函数 send informix queryphp ingres 函数 send an sql query to ingresphp maxdb 函数 check if there any more query results from a multi queryphp snmp 函数 fetch all the snmp objects from an agentphp svn 函数 copies a file or a directory returns true if all is ok false otherwisephp svn 函数 deletes a file or a directory return true if all is ok false otherwisephp sybase 函数 send a sybase query and do not blockphp gearmanclient send data to all job servers to see if they echo it backphp mongocursor if this query should fetch partial results from mongos if a shard is downphp mysqlnduhconnection check if there are any more query results from a multi queryphp sdo das relational 函数 executes an sql query passed as a prepared statement with a list of values to substitute for placeholders and return the results as a normalised data graphphp sdo das relational 函数 executes a given sql query against a relational database and returns the results as a normalised data graphphp solrquery if true solr includes the number of groups that have matched the query in the resultsphp swish 函数 execute a query and return results object
关注编程学问公众号