Database Db operation
One, database configuration
There is a database.php file in the config directory by default, and the default database information is configured here:
<?php
return [
// 默认使用的数据库连接配置
'default' => env('database.driver', 'mysql'),
// 自定义时间查询规则
'time_query_rule' => [],
// 自动写入时间戳字段
// true为自动识别类型 false关闭
// 字符串则明确指定时间字段类型 支持 int timestamp datetime date
'auto_timestamp' => true,
// 时间字段取出后的默认时间格式
'datetime_format' => 'Y-m-d H:i:s',
// 数据库连接配置信息
'connections' => [
'mysql' => [
// 数据库类型
'type' => env('database.type', 'mysql'),
// 服务器地址
'hostname' => env('database.hostname', '127.0.0.1'),
// 数据库名
'database' => env('database.database', ''),
// 用户名
'username' => env('database.username', 'root'),
// 密码
'password' => env('database.password', ''),
// 端口
'hostport' => env('database.hostport', '3306'),
// 数据库连接参数
'params' => [],
// 数据库编码默认采用utf8
'charset' => env('database.charset', 'utf8'),
// 数据库表前缀
'prefix' => env('database.prefix', ''),
// 数据库部署方式:0 集中式(单一服务器),1 分布式(主从服务器)
'deploy' => 0,
// 数据库读写是否分离 主从式有效
'rw_separate' => false,
// 读写分离后 主服务器数量
'master_num' => 1,
// 指定从服务器序号
'slave_no' => '',
// 是否严格检查字段是否存在
'fields_strict' => true,
// 是否需要断线重连
'break_reconnect' => false,
// 监听SQL
'trigger_sql' => env('app_debug', true),
// 开启字段缓存
'fields_cache' => false,
],
// 更多的数据库配置信息
],
];
You can see mysql
that the database is used by default here , and the database configuration information is first env
read from the environment configuration file. If not, the default parameters are used.
.env
File database configuration (modified according to your own database information):
[DATABASE]
TYPE = mysql
HOSTNAME = 127.0.0.1
DATABASE = tp6_test
USERNAME = root
PASSWORD = root
HOSTPORT = 3307
CHARSET = utf8
DEBUG = true
Second, access the database
1. Db class using facade mode
When creating a new Data
controller, what needs to be noted here is the facade\Db
class used, which is think\Db
different from the one used by TP5 :
<?php
namespace app\controller;
use app\BaseController;
use think\facade\Db;
class Data extends BaseController
{
public function index(){
$result = Db::table("demo")->where("id",1)->find();
dump($result);
}
}
2. Using the container method
$result = app("db")->table("demo")->where("id",1)->find();
Third, the database returns abnormal data debugging
1. Open APP_DEBUG
.env
Set in file
APP_DEBUG = true
Then the browser access page will have a debug button in the lower right corner, click it to see the SQL statement, if there is a problem with the returned data, you can check whether the generated SQL statement is wrong, or you can run it in the visual database management tool:
2. Print SQL statements
fetchSql()
You can return SQL statements:
$result = Db::table("demo")->where("id",1)->fetchSql()->find();
dump($result);
You can also use getLastSql
static methods to get SQL statements:
$result = Db::table("demo")->where("id",1)->find();
dump(Db::getLastSql());
The print result is the same as above.
Fourth, add, delete, check and modify CURD operations
1. Add
public function add(){
$data = [
"username" => "wangwu",
"password" => "789"
];
$result = Db::table("demo")->insert($data);
dump(Db::getLastSql());
dump($result);
}
2. Delete
public function delete(){
$result = Db::table("demo")->delete(1);
dump(Db::getLastSql());
dump($result);
}
3. Update
public function update(){
$result = Db::table("demo")->where("id","2")->update(["password"=>"abc"]);
dump(Db::getLastSql());
dump($result);
}