A standard website must be inseparable from database operations. In this set of courses, I will work with you to uncover the mystery of ThinkPHP5 data operations, and happily use ThinkPHP5 to operate the database with you, making database operations more changeable. Pleasure.

Basic usage

Query operation

Db::query('select?*?from?think_user?where?id=?',[8]);

Write operation

Db::execute('insert?into?think_user?(id,?name)?values?(?,??)',[8,'thinkphp']);

Query constructor

Query data

find returns a record, and the result returned is a one-dimensional array. If the result does not exist, NULL is returned.

Db::table('think_user')->where('id',1)->find();

select returns all records, and the result returned is a two-dimensional array. If the result does not exist, NULL is returned. Exists, returns an empty array

Db::table('think_user')->where('status',1)->select();

Assistant function

The system provides a db assistant function for more convenient query:

db('user')->where('id',1)->find();
db('user')->where('status',1)->select();

Note: Using the db assistant function will reconnect to the database every time by default, while using the Db::name or Db::table method is a singleton. If the db function needs to use the same link, you can pass in the third parameter, for example

db('user',[],false)->where('id',1)->find();
db('user',[],false)->where('status',1)->select();

Add data

Use Db The insert method of the class submits data to the database

$data?=?['foo'?=>?'bar',?'bar'?=>?'foo'];
Db::table('think_user')->insert($data);

Add multiple pieces of data

Add multiple pieces of data and pass it directly to the insertAll method of the Db class The data that needs to be added can be

$data?=?[????['foo'?=>?'bar',?'bar'?=>?'foo'],
????['foo'?=>?'bar1',?'bar'?=>?'foo1'],
????['foo'?=>?'bar2',?'bar'?=>?'foo2']
];
Db::name('user')->insertAll($data);

insertAll method adds data successfully and returns the number of successfully added items

Assistant function

//?添加單條數(shù)據(jù)
db('user')->insert($data);

//?添加多條數(shù)據(jù)
db('user')->insertAll($list);

Update data

update method returns the number of affected data, no data is modified and returns 0

Db::table('think_user')->where('id',?1)->update(['name'?=>?'thinkphp']);

Update the value of a certain field: setField method returns the number of affected data, no data is modified The data field returns 0

Db::table('think_user')->where('id',1)->setField('name',?'thinkphp');

自增或自減一個(gè)字段的值
//?score?字段加?1
Db::table('think_user')->where('id',?1)->setInc('score');
//?score?字段加?5
Db::table('think_user')->where('id',?1)->setInc('score',?5);
//?score?字段減?1
Db::table('think_user')->where('id',?1)->setDec('score');
//?score?字段減?5
Db::table('think_user')->where('id',?1)->setDec('score',?5);

Delayed update

Db::table('think_user')->where('id',?1)->setInc('score',?1,?10);

Delete data

//?根據(jù)主鍵刪除
Db::table('think_user')->delete(1);
Db::table('think_user')->delete([1,2,3]);

//?條件刪除????
Db::table('think_user')->where('id',1)->delete();
Db::table('think_user')->where('id','<&#39;,10)->delete();

Conditional query method

where

You can use the where method to query AND conditions:

Db::table('think_user')
????->where('name','like','%thinkphp')
????->where('status',1)
????->find();

whereOr method

Db::table('think_user')
????->where('name','like','%thinkphp')
????->whereOr('title','like','%thinkphp')
????->find();

Mixed query

where method and whereOr method often need to be mixed together in complex query conditions. Here is an example:

$result?=?Db::table('think_user')->where(function?($query)?{
????$query->where('id',?1)->whereor('id',?2);
})->whereOr(function?($query)?{
????$query->where('name',?'like',?'think')->whereOr('name',?'like',?'thinkphp');
})->select();

Query expression

Query expression supports most SQL query syntax and is also the essence of ThinkPHP query language. The usage format of query expression is:

where('字段名','表達(dá)式','查詢條件');
whereOr('字段名','表達(dá)式','查詢條件');

表達(dá)式?含義
EQ、=?等于（=）
NEQ、<>?不等于（<>）
GT、>?大于（>）
EGT、>=?大于等于（>=）
LT、< 小于（<）
ELT、<= 小于等于（<=）
LIKE 模糊查詢
[NOT] BETWEEN （不在）區(qū)間查詢
[NOT] IN （不在）IN 查詢
[NOT] NULL 查詢字段是否（不）是NULL
[NOT] EXISTS EXISTS查詢
EXP 表達(dá)式查詢，支持SQL語(yǔ)法
>?time?時(shí)間比較
<?time?時(shí)間比較
between?time?時(shí)間比較
notbetween?time?時(shí)間比較

[Related tutorial recommendations: thinkphp framework]

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