PHP通过（PDO）Mysql表字段一键生成创建sqlite的SQL_PHP教程

 1     /**
 2      * Mysql表字段一键生成创建sqlite的SQL
 3      * $db 数据库
 4      * $tbname 表名
 5      * $is_blob 需要保存的图片二进制数组 array("img1","img2","img3")形式，默认为false
 6      * $retbname 自定义生成sqlite的表名
 7      * return SQL的语句形式
 8      */
 9      
10     public function creat_sqlite($db, $tbname, $is_blob = false, $retbname = false){
11         
12         $runsql1 = $db->query("SELECT * FROM `$tbname` limit 1");
13         $fields_rows = $runsql1->columnCount();
14         
15         $tb_fields_info = array();
16         $tb_string = "";
17         $dot = "";
18         
19         for ($i = 0; $i < $fields_rows; $i++) {  
20             if ($i == 1) {
21                 $dot = ", ";
22             }
23             
24             $tb_meta = $runsql1->getColumnMeta($i);
25             $tb_string .= $dot.$tb_meta['name'];
26             //var_dump($tb_meta);
27             
28             //如果存在数据且字段存在需要取消的字段中
29             if ($is_blob && in_array($tb_meta['name'], $is_blob)) {
30                 $tb_string .= " "."blob";
31             } else {
32                 //如果不需要保存为二进制
33                 switch($tb_meta['native_type']){
34                     case "VAR_STRING":
35                         $tb_string .= " "."varchar";
36                         break;
37                         
38                     case "LONG":
39                         $tb_string .= " "."integer";
40                         break; 
41                         
42                     case "BLOB":
43                         $tb_string .= " "."text";
44                         break;
45                     case "TINY":
46                         $tb_string .= " "."smallint";
47                         break;
48                 }
49             }
50             
51             if (isset($tb_meta['flags'][1]) && ($tb_meta['flags'][1] === "primary_key")) {
52                 $tb_string .= " "."PRIMARY KEY";
53             }
54             
55             if (isset($tb_meta['flags'][0]) && ($tb_meta['flags'][0] === "not_null")) {
56                 $tb_string .= " "."NOT NULL";
57             }    
58 
59             //var_dump($tb_meta);
60         }
61 
62         //生成的sqlite表名
63         $retbname = $retbname == true ? $retbname : $tbname;
64         
65         //创建数据的SQL语句
66         $creat_data = "CREATE TABLE  IF NOT EXISTS {$retbname} ($tb_string);";  
67                
68         return $creat_data;      
69     }

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