/*

*mysql表结构处理类

*创建数据表，增加，编辑，删除表中字段

*

*/

classMysqlManage{

/*

*创建数据库，并且主键是aid

*table要查询的表名

*/

functioncreateTable($table){

$sql="CREATETABLEIFNOTEXISTS`$table`(`aid`INTNOTNULLprimarykey)ENGINE=InnoDB;";

M()->execute($sql);

$this->checkTable($table);

}

/*

*检测表是否存在，也可以获取表中所有字段的信息

*table要查询的表名

*return表里所有字段的信息

*/

functioncheckTable($table){

$sql="desc`$table`";

$info=M()->execute($sql);

return$info;

}

/*

*检测字段是否存在，也可以获取字段信息(只能是一个字段)

*table表名

*field字段名

*/

functioncheckField($table,$field){

$sql='desc`$table`$field';

$info=M()->execute($sql);

return$info;

}

/*

*添加字段

*table表名

*info字段信息数组array

*return字段信息array

*/

functionaddField($table,$info){

$sql="altertable`$table`add";

$sql.=$this->filterFieldInfo();

M()->execute($sql);

$this->checkField($table,$info['name']);

}

/*

*修改字段

*不能修改字段名称，只能修改

*/

functioneditField($table,$info){

$sql="altertable`$table`modify";

$sql.=$this->filterFieldInfo($info);

M()->execute($sql);

$this->checkField($table,$info['name']);

}

/*

*字段信息数组处理，供添加更新字段时候使用

*info[name]字段名称

*info[type]字段类型

*info[length]字段长度

*info[isNull]是否为空

*info['default']字段默认值

*info['comment']字段备注

*/

privatefunctionfilterFieldInfo($info){

if(!is_array($info))

return

$newInfo=array();

$newInfo['name']=$info['name'];

$newInfo['type']=$info['type'];

switch($info['type']){

case'varchar':

case'char':

$newInfo['length']=empty($info['length'])?100:$info['length'];

$newInfo['isNull']=$info['isNull']==1?'NULL':'NOTNULL';

$newInfo['default']=empty($info['default'])?'':'DEFAULT'.$info['default'];

$newInfo['comment']=empty($info['comment'])?'':'COMMENT'.$info['comment'];

case'int':

$newInfo['length']=empty($info['length'])?7:$info['length'];

$newInfo['isNull']=$info['isNull']==1?'NULL':'NOTNULL';

$newInfo['default']=empty($info['default'])?'':'DEFAULT'.$info['default'];

$newInfo['comment']=empty($info['comment'])?'':'COMMENT'.$info['comment'];

case'text':

$newInfo['length']='';

$newInfo['isNull']=$info['isNull']==1?'NULL':'NOTNULL';

$newInfo['default']='';

$newInfo['comment']=empty($info['comment'])?'':'COMMENT'.$info['comment'];

}

$sql=$newInfo['name'].''.$newInfo['type'];

$sql.=(!empty($newInfo['length']))?($newInfo['length'])."":'';

$sql.=$newInfo['isNull'].'';

$sql.=$newInfo['default'];

$sql.=$newInfo['comment'];

return$sql;

}

/*

*删除字段

*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

*/

functiondropField($table,$field){

$sql="altertable`$table`dropcolumn$field";

M()->execute($sql);

$this->checkField($table,$filed);

}

/*

*获取指定表中指定字段的信息(多字段)

*/

functiongetFieldInfo($table,$field){

$info=array();

if(is_string($field)){

$this->checkField($table,$field);

}else{

foreach($fieldas$v){

$info[$v]=$this->checkField($table,$v);

}

}

return$info;

}

}