对数据的读取 Read
$m=new Model('User');
$m=M('User');
select
$m->select();//获取所有数据,以数组形式返回
find
$m->find($id);//获取单条数据
getField(字段名)//获取一个具体的字段值
$arr=$m->where('id=2')->getField('username');
三、ThinkPHP 3 创建数据 (重点)
对数据的添加 Create
$m=new Model('User');
$m=M('User');
$m->字段名=值
$m->add();
返回值是新增的id号
四、ThinkPHP 3 删除数据 (重点)
$m=M('User');
$m->delete(2); //删除id为2的数据
$m->where('id=2')->delete(); //与上面效果相同,也是删除id为2的数据
返回值是受影响行数
五、ThinkPHP 3 更新数据 (重点)
$m=M('User');
$data['id']=1;
$data['username']='ztz2';
$m->save($data);
返回值是受影响行数
============================================
一、普通查询方式
二、表达式查询方式
三、区间查询
四、统计查询
五、SQL直接查询
一、普通查询方式
a、字符串
$arr=$m->where("sex=0 and username='gege'")->find();
b、数组
$data['sex']=0;
$data['username']='gege';
$arr=$m->where($data)->find();
注意:这种方式默认是and的关系,如果使用or关系,需要添加数组值
$data['sex']=0;
$data['username']='gege';
$data['_logic']='or';
二、表达式查询方式
$data['id']=array('lt',6);
$arr=$m->where($data)->select();
EQ 等于
NEQ不等于
GT 大于
EGT大于等于
LT 小于
ELT小于等于
LIKE 模糊查询
$data['username']=array('like','%ge');
$arr=$m->where($data)->select();
NOTLIKE
$data['username']=array('notlike','%ge%'); //notlike中间没有空格
$arr=$m->where($data)->select();
注意:如果一个字段要匹配多个通配符
$data['username']=array('like',array('%ge%','%2%','%五%'),'and');//如果没有第三个值,默认关系是or关系
$arr=$m->where($data)->select();
BETWEEN
$data['id']=array('between',array(5,7));
$arr=$m->where($data)->select();
//SELECT * FROM `tp_user` WHERE ( (`id` BETWEEN 5 AND 7 ) )
$data['id']=array('not between',array(5,7));//注意,not 和 between中间一定要有空格
$arr=$m->where($data)->select();
IN
$data['id']=array('in',array(4,6,7));
$arr=$m->where($data)->select();
//SELECT * FROM `tp_user` WHERE ( `id` IN (4,6,7) )
$data['id']=array('not in',array(4,6,7));
$arr=$m->where($data)->select();
//SELECT * FROM `tp_user` WHERE ( `id` NOT IN (4,6,7) )
三、区间查询
$data['id']=array(array('gt',4),array('lt',10));//默认关系是 and 的关系
//SELECT * FROM `tp_user` WHERE ( (`id` > 4) AND (`id`
$data['id']=array(array('gt',4),array('lt',10),'or') //关系就是or的关系
$data['name']=array(array('like','%2%'),array('like','%五%'),'gege','or');
四、统计查询
count //获取个数
max //获取最大数
min //获取最小数
avg //获取平均数
sum //获取总和
五、SQL直接查询
a、query 主要数处理读取数据的
成功返回数据的结果集
失败返回boolean false
$m=M();
$result=$m->query("select * from t_user where id >50");
var_dump($result);
b、execute 用于更新个写入操作
成功返回影响行数
失败返回boolean false
$m=M();
$result=$m->execute("insert into t_user(`username`) values('ztz3')");
var_dump($result);

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