此方法获取搜索关键字和解析的 mysql 查询,并重写 where 表达式以包含 LIKE %keyword%。
它运作良好,但我不知道有这么多循环的方法是好还是坏......
private function build_where($query_array, $options)
{
//add WHERE starting point
$where = '';
if(!empty($query_array['WHERE']))
{
//build where array
$where_array = $query_array['WHERE'];
//start the where
$where .= 'WHERE ';
//get columns array
$columns_array = $this->build_columns_array($query_array);
//if there is a search string
if(!empty($options['sSearch']))
{
//check for enabled columns
$i = 0;
$columns_length = count($columns_array);
for($i; $i < intval($columns_length); $i++)
{
//create the options boolean array
$searchable_columns['bSearchable_'.$i] = $options['bSearchable_'.$i];
}
//loop through searchable_columns for true values
foreach($searchable_columns as $searchable_column_key => $searchable_column_val)
{
if($searchable_column_val == true)
{
//get an integer from the searchable_column key
$column_id = preg_replace("/[^0-9]/", '', $searchable_column_key);
//lookup column name by index
foreach($columns_array as $columns_array_key => $columns_array_val)
{
//if the $columns_array_key matches the $column_id
if($columns_array_key == $column_id)
{
//loop to build where foreach base expression
$i = 0;
$where_length = count($where_array);
for($i; $i < intval($where_length); $i++)
{
//append the existing WHERE Expressions
$where .= $where_array[$i]['base_expr'];
}
//append the LIKE '%$options['sSearch'])%'
$where .= ' AND '.$columns_array_val." LIKE '%".$options['sSearch']."%' OR ";
}
}
}
}
//remove the last OR
$where = substr_replace($where, "", -3);
}
else
{
//loop to build where
$i = 0;
$where_length = count($where_array);
for($i; $i < intval($where_length); $i++)
{
$where .= $where_array[$i]['base_expr'];
}
}
}
//print_r($where_length);
return $where;
}