init library

composer.json

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+{
+    "name": "monken/tablesigniter",
+    "description": "This library will help you use jQuery Datatables based on CodeIgniter4.",
+    "type": "library",
+    "keywords": [
+		"codeigniter",
+		"codeigniter4",
+		"Datatables"
+	],
+    "authors": [
+        {
+            "name": "monkenWu",
+            "email": "[email protected]"
+        }
+    ],
+    "minimum-stability": "stable",
+    "require": {
+        "php" : "^7.1"
+    },
+    "license": "MIT",
+    "autoload": {
+		"psr-4": {
+			"monken\\": "src/"
+		}
+	}
+}

src/TablesIgniter.php

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+<?php namespace monken;
+/**
+ * TablesIgniter
+ *
+ * TablesIgniter 基於 CodeIgniter4 。它將可以幫助你在 使用 server side mode 中使用 jQuery Datatables。 
+ * TablesIgniter based on CodeIgniter4. This  library will help you use jQuery Datatables in server side mode.
+ * @package    CodeIgniter
+ * @subpackage libraries
+ * @category   library
+ * @version    1.0.0
+ * @author    monkenWu <[email protected]>
+ * @link      https://github.com/monkenWu/TablesIgniter
+ *        
+ */
+
+use Closure;
+
+class TablesIgniter{
+
+    protected $db;
+    protected $builder;
+    protected $outputColumn;
+    protected $defaultOrder = [];
+    protected $searchLike = false;
+
+    public function __construct(&$db){
+        $this->db =& $db;
+    }
+
+    public function setTable(Closure $fun){
+        $this->builder = $fun($this->db);
+        return $this;
+    }
+
+    public function setSearch(array $like){
+        $this->searchLike = $like;
+        return $this;
+    }
+
+    /**
+     * 設定預設排序項目
+     * 
+     * @param string $item
+     * @param string $type
+     * @return mixed
+     */
+    public function setDefaultOrder($item,$type="ASC"){
+        $this->defaultOrder[] = array($item, $type);
+        return $this;
+    }
+
+    /**
+     * 設定實際輸出的序列
+     * @param array $columns
+     * @return mixed
+     */
+    public function setOutput(array $column){
+        $this->outputColumn = $column;
+        return $this;
+    }
+
+    /**
+     * 搜索總筆數
+     */
+    private function getFiltered(){
+        $bui = $this->extraConfig($this->builder);
+        $query = $bui->countAll();  
+        return $query; 
+    }
+
+    /**
+     * 總筆數
+     */
+    private function getTotal(){
+        //$this->extra_config();
+        $bui = $this->builder;
+        $query = $bui->countAllResults();  
+        return $query;  
+    }
+
+    /**
+     * 執行查詢
+     * 在此停止ci->db類別紀錄規則
+     * @return  array
+     */
+    private function getQuery(){
+        $bui = $this->extraConfig($this->builder);
+        if(isset($_POST["length"])){
+            if($_POST["length"] != -1) {  
+                $bui->limit($_POST['length'], $_POST['start']);
+            }
+        }
+        $query = $bui->get();
+        return $query;
+    }
+
+    /**
+     * 合成每列資料的內容。
+     * 
+     * @param array $row
+    * @return array     
+    */
+    private function getOutputData($row){
+        $subArray = array();
+        foreach ($this->outputColumn as $colKey => $data) {
+            if(gettype($data) != "string"){
+                $subArray[] = $data($row);
+            }else{
+                $subArray[] = $row[$data];
+            }
+        }
+        return $subArray;
+    }
+
+     /**
+     * 查詢是否有有排序或搜索的要求
+     */
+    private function extraConfig($bui){
+        if(!empty($_POST["search"]["value"])){  
+            foreach ($this->searchLike as $field) {
+                $bui->orLike($field,$_POST["search"]["value"]);
+            }
+        }
+        if(isset($_POST["order"])){  
+            $bui->orderby($_POST['order']['0']['column'], $_POST['order']['0']['dir']);  
+        }else{
+            if(count($this->defaultOrder)!=0){
+                foreach ($this->defaultOrder as $value) {
+                    $bui->orderby($value[0], $value[1]); 
+                }
+            }
+        }
+        return $bui;
+    }
+
+    /**
+     * 取得完整的Datatable Json字串
+     * @return string
+     */
+    public function getDatatable(){
+        if($result = $this->getQuery()){
+            $data = array();
+            //print_r($result->getResult('array'));
+            foreach ($result->getResult('array') as $row){
+                $data[] = $this->getOutputData($row);
+            }
+            $output = array(
+                "draw" => (int)$_POST["draw"] ?? -1,
+                "recordsTotal" => $this->getTotal(),
+                "recordsFiltered" => $this->getFiltered(),
+                "data" => $data
+            );
+            return json_encode($output);
+        }
+        return $data;
+    }
+
+}