ThinkPHP Mysql表结构修改类
- WBOYoriginal
- 2016-06-07 11:41:141433parcourir
基于ThinkPHP的Mysql表结构更改类，可以创建数据表，添加，编辑删除字段<?php <br />
/*<br>
* mysql表结构处理类<br>
* 创建数据表，增加，编辑，删除表中字段<br>
*<br>
*/<br>
class MysqlManage{<br>
/*<br>
* 创建数据库，并且主键是aid<br>
* table 要查询的表名<br>
*/<br>
function createTable($table){<br>
$sql="CREATE TABLE IF NOT EXISTS `$table` (`aid` INT NOT NULL primary key)ENGINE = InnoDB;";<br>
M()->execute($sql);<br>
$this->checkTable($table);<br>
}<br>
/*<br>
* 检测表是否存在，也可以获取表中所有字段的信息<br>
* table 要查询的表名<br>
* return 表里所有字段的信息<br>
*/<br>
function checkTable($table){<br>
$sql="desc `$table`";<br>
$info=M()->execute($sql);<br>
return $info;<br>
}<br>
<br>
/*<br>
* 检测字段是否存在，也可以获取字段信息(只能是一个字段)<br>
* table 表名<br>
* field 字段名<br>
*/<br>
function checkField($table,$field){<br>
$sql='desc `$table` $field';<br>
$info=M()->execute($sql);<br>
return $info;<br>
}<br>
<br>
/*<br>
* 添加字段<br>
* table 表名<br>
* info 字段信息数组 array<br>
* return 字段信息 array<br>
*/<br>
function addField($table,$info){<br>
$sql="alter table `$table` add column";<br>
$sql.=$this->filterFieldInfo();<br>
M()->execute($sql);<br>
$this->checkField($table,$info['name']);<br>
}<br>
<br>
/*<br>
* 修改字段<br>
* 不能修改字段名称，只能修改<br>
*/<br>
function editField($table,$info){<br>
$sql="alter table `$table` modify ";<br>
$sql.=$this->filterFieldInfo($info);<br>
M()->execute($sql);<br>
$this->checkField($table,$info['name']);<br>
}<br>
<br>
/*<br>
* 字段信息数组处理，供添加更新字段时候使用<br>
* info[name] 字段名称<br>
* info[type] 字段类型<br>
* info[length] 字段长度<br>
* info[isNull] 是否为空<br>
* info['default'] 字段默认值<br>
* info['comment'] 字段备注<br>
*/<br>
private function filterFieldInfo($info){<br>
if(!is_array($info))<br>
return<br>
$newInfo=array();<br>
$newInfo['name']=$info['name'];<br>
$newInfo['type']=$info['type'];<br>
switch($info['type']){<br>
case 'varchar':<br>
case 'char':<br>
$newInfo['length']=empty($info['length'])?100:$info['length'];<br>
$newInfo['isNull']=$info['isNull']==1?'NULL':'NOT NULL';<br>
$newInfo['default']=empty($info['default'])?'':'DEFAULT '.$info['default'];<br>
$newInfo['comment']=empty($info['comment'])?'':'COMMENT '.$info['comment'];<br>
break;<br>
case 'int':<br>
$newInfo['length']=empty($info['length'])?7:$info['length'];<br>
$newInfo['isNull']=$info['isNull']==1?'NULL':'NOT NULL';<br>
$newInfo['default']=empty($info['default'])?'':'DEFAULT '.$info['default'];<br>
$newInfo['comment']=empty($info['comment'])?'':'COMMENT '.$info['comment'];<br>
break;<br>
case 'text':<br>
$newInfo['length']='';<br>
$newInfo['isNull']=$info['isNull']==1?'NULL':'NOT NULL';<br>
$newInfo['default']='';<br>
$newInfo['comment']=empty($info['comment'])?'':'COMMENT '.$info['comment'];<br>
break;<br>
}<br>
$sql=$newInfo['name']." ".$newInfo['type'];<br>
$sql.=(!empty($newInfo['length']))?($newInfo['length']) .' ':' ';<br>
$sql.=$newInfo['isNull'].' ';<br>
$sql.=$newInfo['default'];<br>
$sql.=$newInfo['comment'];<br>
return $sql;<br>
}<br>
<br>
/*<br>
* 删除字段<br>
* 如果返回了字段信息则说明删除失败，返回false，则为删除成功<br>
*/<br>
function dropField($table,$field){<br>
$sql="alter table `$table` drop column $field";<br>
M()->execute($sql);<br>
$this->checkField($table,$filed);<br>
}<br>
<br>
/*<br>
* 获取指定表中指定字段的信息(多字段)<br>
*/<br>
function getFieldInfo($table,$field){<br>
$info=array();<br>
if(is_string($field)){<br>
$this->checkField($table,$field);<br>
}else{<br>
foreach($field as $v){<br>
$info[$v]=$this->checkField($table,$v);<br>
}<br>
}<br>
return $info;<br>
}<br>
}转载请注明出处:http://a3147972.blog.51cto.com/2366547/1543179
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