ddal-demos

• This project lists some useful demos to show how to use DDAL in different scenes. If you want to know more about DDAL see DDAL wiki.

Demo0

• 0. design a scene

Assume that you need to route 'base' schema and 'user' table,
and the schema's route rule is "{#scName}_{#format('%02d', #sdValue % 2)}",
the table's route rule is "{#tbName}_{#format('%04d', #sdValue % 8)}"

By useing the route rule, we can get the following physical tables:
base_00.user_0000;
base_00.user_0002;
base_00.user_0004;
base_00.user_0005;
base_01.user_0001;
base_01.user_0003;
base_01.user_0005;
base_01.user_0007;

• 1. initialize database and table

use InitDatabaseSqlBuilder to build the following sql

CREATE DATABASE IF NOT EXISTS `base_00` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
use base_00;
CREATE TABLE sequence (
  id bigint(20) NOT NULL AUTO_INCREMENT,
  schema_name varchar(32) NOT NULL,
  table_name varchar(64) NOT NULL,
  begin_value bigint(20) NOT NULL,
  next_value bigint(20) NOT NULL,
  end_value bigint(20) DEFAULT NULL,
  step int(11),
  skip_n_steps int(11),
  select_order int(11) NOT NULL,
  version bigint(20) NOT NULL DEFAULT '0',
  deleted tinyint(1) NOT NULL DEFAULT '0',
  PRIMARY KEY (id),
  KEY idx_table_name_schema_name_deleted_select_order (table_name,schema_name,deleted,select_order) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO sequence(id,schema_name,table_name,begin_value,next_value,end_value,step,skip_n_steps,select_order,version,deleted)
  VALUES(1, 'base', 'user', 0, 0, NULL, NULL, NULL, 0, 0, 0);
CREATE TABLE `user_0000`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;
CREATE TABLE `user_0002`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;
CREATE TABLE `user_0004`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;
CREATE TABLE `user_0006`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;

CREATE DATABASE IF NOT EXISTS `base_01` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
use base_01;
CREATE TABLE `user_0001`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;
CREATE TABLE `user_0003`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;
CREATE TABLE `user_0005`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;
CREATE TABLE `user_0007`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;

• 2. modify database config in file 'db.properties'

jdbc.url=jdbc:mysql://127.0.0.1:3306/base_00?verifyServerCertificate=false&useSSL=true
jdbc.w.username=w_base
jdbc.w.password=password
jdbc.r0.username=r_base
jdbc.r0.password=password

• 3. run and check test cases

org.hellojavaer.ddal.demos.demo0.UserDaoTest.testForCRUD
org.hellojavaer.ddal.demos.demo0.UserDaoTest.scanQueryAll
org.hellojavaer.ddal.demos.demo0.UserDaoTest.groupRouteInfo

Demo1

• 0. initialize database and table

CREATE DATABASE `acl` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
use acl;
CREATE TABLE `role`(`id` bigint(20) NOT NULL, `name` varchar(32) NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY `idx_name` (`name`) USING BTREE ) ENGINE=InnoDB;

• 2. modify database config in file 'db.properties'

jdbc.url=jdbc:mysql://127.0.0.1:3306/base_00?verifyServerCertificate=false&useSSL=true
jdbc.w.username=w_base
jdbc.w.password=password
jdbc.r0.username=r_base
jdbc.r0.password=password

• 3. run and check test cases

org.hellojavaer.ddal.demos.demo1.RoleDaoTest.testForCRUD
org.hellojavaer.ddal.demos.demo1.RoleDaoTest.testLoadBalance

License

ddal-demos is licensed under MIT License.