thinkphp's CURD and query methods_PHP tutorial

Reading of data Read

$m=new Model('User');

$m=M('User');

select

$m->select();//Get all data and return it in array form

find

$m->find($id);//Get a single piece of data

getField(field name)//Get a specific field value

$arr=$m->where('id=2')->getField('username');

3. Create data in ThinkPHP 3 (Key points)

Adding data Create

$m=new Model('User');

$m=M('User');

$m->field name=value

$m->add();

The return value is the new id number

4. Delete data in ThinkPHP 3 (Key points)

$m=M('User');

$m->delete(2); //Delete the data with id 2

$m->where('id=2')->delete(); //Same effect as above, also deletes the data with id 2

The return value is the number of affected rows

5. ThinkPHP 3 update data (key points)

$m=M('User');

$data['id']=1;

$data['username']='ztz2';

$m->save($data);

The return value is the number of affected rows

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1. Ordinary query methods

2. Expression query method

3. Interval query

4. Statistical query

5. SQL direct query

1. Ordinary query methods

a. String

$arr=$m->where("sex=0 and username='gege'")->find();

b. Array

$data['sex']=0;

$data['username']='gege';

$arr=$m->where($data)->find();

Note: This method defaults to an and relationship. If you use an or relationship, you need to add an array value

$data['sex']=0;

$data['username']='gege';

$data['_logic']='or';

2. Expression query method

$data['id']=array('lt',6);

$arr=$m->where($data)->select();

EQ equals

NEQ is not equal to

GT is greater than

EGT is greater than or equal to

LT is less than

ELT is less than or equal to

LIKE fuzzy query

$data['username']=array('like','%ge');

$arr=$m->where($data)->select();

NOTLIKE

$data['username']=array('notlike','%ge%'); //There is no space in the middle of notlike

$arr=$m->where($data)->select();

Note: If a field needs to match multiple wildcard characters

$data['username']=array('like',array('%ge%','%2%','%五%'),'and');//If there is no third value, the default The relationship is or relationship

$arr=$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));//Note, there must be a space between not and between

$arr=$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) )

3. Interval query

$data['id']=array(array('gt',4),array('lt',10));//The default relationship is the relationship of and

//SELECT * FROM `tp_user` WHERE ( (`id` > 4) AND (`id`

$data['id']=array(array('gt',4),array('lt',10),'or') //The relationship is the relationship of or

$data['name']=array(array('like','%2%'),array('like','%五%'),'gege','or');

4. Statistical query

count //Get the number

max //Get the maximum number

min //Get the minimum number

avg //Get the average

sum //Get the sum

5. SQL direct query

a. Query is mainly used for data processing

Result set of successfully returned data

Returns boolean false

on failure

$m=M();

$result=$m->query("select * from t_user where id >50");

var_dump($result);

b. execute is used to update a write operation

Successfully returns the number of affected rows

Returns boolean false

on failure

$m=M();

$result=$m->execute("insert into t_user(`username`) values('ztz3')");

var_dump($result);

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