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Improve dba

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- Add dba::count
- Add support for LIMIT X,X
This commit is contained in:
Hypolite Petovan 2017-12-01 00:34:54 -05:00
parent 3cebdee867
commit 84418860bd
1 changed files with 73 additions and 12 deletions
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85
include/dba.php
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@ -1104,7 +1104,8 @@ class dba {
* *
* $data = dba::select($table, $fields, $condition, $params); * $data = dba::select($table, $fields, $condition, $params);
*/ */
public static function select($table, $fields = array(), $condition = array(), $params = array()) { public static function select($table, array $fields = [], array $condition = [], array $params = [])
{
if ($table == '') { if ($table == '') {
return false; return false;
} }
@ -1115,17 +1116,7 @@ class dba {
$select_fields = "*"; $select_fields = "*";
} }
if (count($condition) > 0) { $condition_string = self::buildCondition($condition);
$array_element = each($condition);
$array_key = $array_element['key'];
if (is_int($array_key)) {
$condition_string = " WHERE ".array_shift($condition);
} else {
$condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
}
} else {
$condition_string = "";
}
$param_string = ''; $param_string = '';
$single_row = false; $single_row = false;
@ -1147,6 +1138,11 @@ class dba {
$single_row = ($params['limit'] == 1); $single_row = ($params['limit'] == 1);
} }
if (isset($params['limit']) && is_array($params['limit'])) {
$param_string .= " LIMIT ".intval($params['limit'][0]).", ".intval($params['limit'][1]);
$single_row = ($params['limit'][1] == 1);
}
if (isset($params['only_query']) && $params['only_query']) { if (isset($params['only_query']) && $params['only_query']) {
$single_row = !$params['only_query']; $single_row = !$params['only_query'];
} }
@ -1164,6 +1160,71 @@ class dba {
} }
} }
/**
* @brief Counts the rows from a table satisfying the provided condition
*
* @param string $table Table name
* @param array $condition array of fields for condition
*
* @return int
*
* Example:
* $table = "item";
*
* $condition = ["uid" => 1, "network" => 'dspr'];
* or:
* $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
*
* $count = dba::count($table, $condition);
*/
public static function count($table, array $condition = [])
{
if ($table == '') {
return false;
}
$condition_string = self::buildCondition($condition);
$sql = "SELECT COUNT(*) AS `count` FROM `".$table."`".$condition_string;
$row = self::fetch_first($sql, $condition);
return $row['count'];
}
/**
* @brief Returns the SQL condition string built from the provided condition array
*
* This function operates with two modes.
* - Supplied with a filed/value associative array, it builds simple strict
* equality conditions linked by AND.
* - Supplied with a flat list, the first element is the condition string and
* the following arguments are the values to be interpolated
*
* $condition = ["uid" => 1, "network" => 'dspr'];
* or:
* $condition = ["`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'];
*
* In either case, the provided array is left with the parameters only
*
* @param array $condition
* @return string
*/
private static function buildCondition(array &$condition = [])
{
$condition_string = '';
if (count($condition) > 0) {
$array_element = each($condition);
$array_key = $array_element['key'];
if (is_int($array_key)) {
$condition_string = " WHERE ".array_shift($condition);
} else {
$condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?";
}
}
return $condition_string;
}
/** /**
* @brief Fills an array with data from a query * @brief Fills an array with data from a query