DDL

數(shù)據(jù)庫模式定義語言DDL(Data Definition Language)，是用于描述數(shù)據(jù)庫中要存儲的現(xiàn)實(shí)世界實(shí)體的語言。Easyswoole提供了一個(gè)DDL庫，方便用戶用于定義一個(gè)數(shù)據(jù)庫表結(jié)構(gòu)。

組件要求

• easyswoole / spl：^ 1.2

安裝方法

composer require easyswoole/ddl

倉庫地址

easyswoole/ddl

基本使用

創(chuàng)建表(CreateTable)

use EasySwoole\DDL\Blueprint\Create\Table as CreateTable;
use EasySwoole\DDL\DDLBuilder;
use EasySwoole\DDL\Enum\Character;
use EasySwoole\DDL\Enum\Engine;

$scoreSql = DDLBuilder::create('score', function (CreateTable $table) {
    $table->setIfNotExists()->setTableComment('成績表');          //設(shè)置表名稱
    $table->setTableCharset(Character::UTF8MB4_GENERAL_CI);     //設(shè)置表字符集
    $table->setTableEngine(Engine::INNODB);                     //設(shè)置表引擎
    $table->int('id')->setIsUnsigned()->setIsAutoIncrement()->setIsPrimaryKey()->setColumnComment('自增ID');
    $table->int('stu_id')->setIsUnsigned()->setColumnComment('學(xué)生id');
    $table->int('course_id')->setIsUnsigned()->setZeroFill()->setColumnComment('課程id');
    $table->float('score', 3, 1)->setColumnComment('成績');
    $table->int('created_at', 10)->setColumnComment('創(chuàng)建時(shí)間');
    $table->foreign(null,'stu_id','student','stu_id')
        ->setOnDelete(Foreign::CASCADE)->setOnUpdate(Foreign::CASCADE);
});
echo $scoreSql;

//結(jié)果如下：

CREATE TABLE IF NOT EXISTS `score` (
  `id` int UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID',
  `stu_id` int UNSIGNED NOT NULL COMMENT '學(xué)生id',
  `course_id` int UNSIGNED ZEROFILL NOT NULL COMMENT '課程id',
  `score` float(3,1) NOT NULL COMMENT '成績',
  `created_at` int(10) NOT NULL COMMENT '創(chuàng)建時(shí)間',
  FOREIGN KEY (`stu_id`) REFERENCES `student` (`stu_id`) ON DELETE CASCADE ON UPDATE CASCADE
)
ENGINE = INNODB DEFAULT COLLATE = 'utf8mb4_general_ci' COMMENT = '成績表';

修改表(AlterTable)

use EasySwoole\DDL\Blueprint\Alter\Table as AlterTable;
use EasySwoole\DDL\DDLBuilder;

$alterStuScoreSql = DDLBuilder::alter('score', function (AlterTable $table) {
    $table->setRenameTable('student_score')->setTableComment('學(xué)生成績表');
    $table->modifyIndex('ind_score')->normal('ind_score', 'score')->setIndexComment('學(xué)生成績--普通索引');
    $table->modifyForeign('fk_stu_id')->foreign('fk_stu_id', 'stu_id', 'student_info', 'stu_id');
});
echo $alterStuScoreSql;

//結(jié)果如下：

ALTER TABLE `score` RENAME TO `student_score`;
ALTER TABLE `student_score` 
COMMENT = '學(xué)生成績表',
DROP INDEX `ind_score`,
ADD INDEX `ind_score` (`score`) COMMENT '學(xué)生成績--普通索引';
ALTER TABLE `student_score` DROP FOREIGN KEY `fk_stu_id`;
ALTER TABLE `student_score` ADD CONSTRAINT `fk_stu_id` FOREIGN KEY (`stu_id`) REFERENCES `student_info` (`stu_id`);

刪除表(DropTable)

use EasySwoole\DDL\DDLBuilder;

$dropStuScoreSql = DDLBuilder::drop('student_score');
echo $dropStuScoreSql;

//結(jié)果如下：

DROP TABLE `student`;