Let's talk about Thinkphp 5.0's operation of database (key code)

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

// 添加单条数据
db('user')->insert($data);

// 添加多条数据
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');

自增或自减一个字段的值
// 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 字段减 1
Db::table('think_user')->where('id', 1)->setDec('score');
// score 字段减 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

// 根据主键删除
Db::table('think_user')->delete(1);
Db::table('think_user')->delete([1,2,3]);

// 条件删除    
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','表达式','查询条件');
whereOr('字段名','表达式','查询条件');

表达式 含义
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
[NOT] BETWEEN （不在）区间查询
[NOT] IN （不在）IN 查询
[NOT] NULL 查询字段是否（不）是NULL
[NOT] EXISTS EXISTS查询
EXP 表达式查询，支持SQL语法
> time 时间比较
< time 时间比较
between time 时间比较
notbetween time 时间比较

[Related tutorial recommendations: thinkphp framework]

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