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前言
Visor（http://www.visor.com.cn) 是一个基于HTML5 Canvas 开发的IDE 框架和设计开发平台，有关Visor的设计架构和技术应用，在以后的文章里会逐渐跟大家分享，今天主要是分享一下它的数据库设计功能和SQL生成功能。在众多的软件项目里面，权限管理基本上都是必备的，看到有网友甚至为权限管理单独做了一套框架，目的都是为了很快的应用到不同的项目里面，减少开发的成本。本人也做过很多类似的工作，不论多好的框架都只能解决80%的用户，总有20%的用户会让你花80%的精力重复做过的事情，下边就说说在Visor 中如何完成数据库设计，并且通过模板生成数据库DDL SQL 和实体对象。
1. 建模设计，在Visor 里面，现在提供三种设计器，流程设计，ER设计和JPA实体设计，只有ER设计里面完成的ER图可以生成数据库需要的DDL SQL。
2. 设计模板
在文档菜单里面可以下载建模生成的数据表对象关系数据文件，数据文件是JSON格式的，然后用你熟悉的模板语言去生成想要的SQL代码和实体代码，在项目有严格规范的情况下，可以生成更多的对象，如DAO，Service，resultful api 等。可以说一劳永逸。 在Visor里面，默认使用的是Jsrender ，而且已经提供了生成ORACLE，SQL Server 和MYSQL 对应的ＤＤＬ的模板。完成建模以后，点击相应的模板，可以下载对应数据库的DDL SQL文件. 里面会包含唯一索引和非空约束， 如果你要在数据库里面建立更多的约束和索引，这还需要手动完成。但是这些对象是否要创建在数据库里都还有争议。
{ "tables": [ { "name": "Users", "text": "Users", "auditable": false, "prefix": "", "abbreviation": "", "annotation": "", "cachable": false, "namespace": "", "strategy": "seqence", "sequenceName": "", "owner": "", "fields": [ { "name": "id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": false, "reftable": "", "refield": "", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "name", "text": "name", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "email", "text": "email", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "password", "text": "password", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "active", "text": "active", "abbreviation": "", "datatype": "boolean", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ], "pks": [ { "name": "id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": false, "reftable": "", "refield": "", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ] }, { "name": "Roles", "text": "Roles", "auditable": false, "prefix": "", "abbreviation": "", "annotation": "", "cachable": false, "namespace": "", "strategy": "seqence", "sequenceName": "", "owner": "", "fields": [ { "name": "id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": false, "reftable": "", "refield": "", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "name", "text": "name", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "description", "text": "description", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ], "pks": [ { "name": "id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": false, "reftable": "", "refield": "", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ] }, { "name": "User_Role", "text": "User_Role", "auditable": false, "prefix": "", "abbreviation": "", "annotation": "", "cachable": false, "namespace": "", "strategy": "seqence", "sequenceName": "", "owner": "", "fields": [ { "name": "User_id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": true, "reftable": "Users", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "Role_id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": true, "reftable": "Roles", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ], "pks": [ { "name": "User_id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": true, "reftable": "Users", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "Role_id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": true, "reftable": "Roles", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ] }, { "name": "privileges", "text": "table1", "auditable": false, "prefix": "", "abbreviation": "", "annotation": "", "cachable": false, "namespace": "", "strategy": "seqence", "sequenceName": "", "owner": "", "fields": [ { "name": "id", "text": "id", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": true, "isfk": false, "reftable": "", "refield": "", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "name", "text": "name", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "description", "text": "description", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": false, "isfk": false, "reftable": "", "refield": "", "nullable": true, "unique": false, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ], "pks": [ { "name": "id", "text": "id", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": true, "isfk": false, "reftable": "", "refield": "", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ] }, { "name": "Role_Privilege", "text": "table1", "auditable": false, "prefix": "", "abbreviation": "", "annotation": "", "cachable": false, "namespace": "", "strategy": "seqence", "sequenceName": "", "owner": "", "fields": [ { "name": "Roles_id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": true, "reftable": "Roles", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "privilege_id", "text": "id", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": true, "isfk": true, "reftable": "privilege", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ], "pks": [ { "name": "Roles_id", "text": "id", "abbreviation": "", "datatype": "number", "precision": 0, "ispk": true, "isfk": true, "reftable": "Roles", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 }, { "name": "privilege_id", "text": "id", "abbreviation": "", "datatype": "varchar", "precision": 0, "ispk": true, "isfk": true, "reftable": "privilege", "refield": "id", "nullable": false, "unique": true, "annotation": "", "defaultvalue": "", "length": 255, "integer": 19, "decimal": 0 } ] } ], "connections": [ { "name": "R1", "identifying": true, "nullable": false, "source_owner": "", "source_prefix": "", "source": "Users", "target_owner": "", "target_prefix": "", "target": "User_Role", "elements": [ { "key": "id", "value": "User_id" } ] }, { "name": "R2", "identifying": true, "nullable": false, "source_owner": "", "source_prefix": "", "source": "Roles", "target_owner": "", "target_prefix": "", "target": "User_Role", "elements": [ { "key": "id", "value": "Role_id" } ] }, { "name": "R3", "identifying": true, "nullable": false, "source_owner": "", "source_prefix": "", "source": "Roles", "target_owner": "", "target_prefix": "", "target": "Role_Privilege", "elements": [ { "key": "id", "value": "Roles_id" } ] }, { "name": "R4", "identifying": true, "nullable": false, "source_owner": "", "source_prefix": "", "source": "privileges", "target_owner": "", "target_prefix": "", "target": "Role_Privilege", "elements": [ { "key": "id", "value": "privilege_id" } ] } ], "option": { "datetime": "2015-05-25T04:32:51.916Z" } }
3. 完善建模设计和模板
项目需求会不停的改变，不同项目也有可能会应用不同的技术和语言。而我们要做的只是完善建模和制作新的模板。 而那些重复的工作，就让Visor 替你去完成吧。
Visor 应用之一 通过ER 设计生成数据库脚本和实体对象
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原文地址：http://www.cnblogs.com/zhouto/p/4527627.html
