A orm database Flutter plugin.之前发了一篇文章《手把手教你在Flutter项目优雅的使用ORM数据库》，很多人咨询使用也提了一些宝贵的意见，说不希望要写lua，这样不够优雅，也增加了学习成本。细想了一下，确实是，对flutter项目开发来讲，最好就是纯flutter版的orm框架，于是我就写了一个flutter版的 orm插件flutter_orm_plugin ，使用的demo我放到github上了，大家可以下载来玩玩。下面我介绍一下flutter_orm_plugin提供的所有api。添加orm表flutter_orm_plugin中一个orm对应一个表，例如demo中Student表，它所在的db名字叫School，表名叫Student，它包含如下四个字段：studentId 在数据库中是Integer类型，主键，自增的。name 在数据库中是Text类型class 在数据库中是Text类型，是外键，关联的表是另一个表Class表score 在数据库中是Real类型创建这样的表的代码在demo的main.dart中 Map<String , Field> fields = new Map<String , Field>(); fields[“studentId”] = Field(FieldType.Integer, primaryKey: true , autoIncrement: true); fields[“name”] = Field(FieldType.Text); fields[“class”] = Field(FieldType.Text, foreignKey: true, to: “School_Class”); fields[“score”] = Field(FieldType.Real); FlutterOrmPlugin.createTable(“School”,“Student”,fields);数据库中某一列的数据通过Field类定义，我们先看看Field的定义就可以知道我们的orm对象支持哪些属性了class Field { final FieldType type;//类型包括Integer、Real、Blob、Char、Text、Boolean bool unique;//是否惟一 int maxLength; bool primaryKey;//是否主键 bool foreignKey;//是否外键 bool autoIncrement;//是否自增 String to;//关联外键表，以DBName_TableName命名 bool index;//是否有索引}插入数据单条插入 Map m = {“name”:“william”, “class”:“class1”, “score”:96.5}; FlutterOrmPlugin.saveOrm(“Student”, m);批量插入 List orms = new List(); for(int i = 0 ; i < 100 ; i++) { Map m = {“name”:name, “class”:className, “score”:score}; orms.add(m); } FlutterOrmPlugin.batchSaveOrms(“Student”, orms); 查询数据全部查询 Query(“Student”).all().then((List l) { }); 查询第一条 Query(“Student”).first().then((Map m) { }); 根据主键查询 Query(“Student”).primaryKey([1,3,5]).all().then((List l) { }); where条件查询 Query(“Student”).whereByColumFilters([WhereCondiction(“score”, WhereCondictionType.EQ_OR_MORE_THEN, 90)]).all().then((List l) { }); where sql 语句查询 Query(“Student”).whereBySql(“class in (?,?) and score > ?”, [“class1”,“class2”,90]).all().then((List l) { }); where 查询并排序 Query(“Student”).orderBy([“score desc”,]).all().then((List l) { }); 查询指定列 Query(“Student”).needColums([“studentId”,“name”]).all().then((List l) { }); group by 、having 查询 Query(“Student”).needColums([“class”]).groupBy([“class”]).havingByBindings(“avg(score) > ?”, [40]).orderBy([“avg(score)”]).all().then((List l) { }); 更新数据全部更新 Query(“Student”).update({“name”:“test all update”}); 根据主键更新 Query(“Student”).primaryKey([11]).update({“name”:“test update by primary key”}); 根据特定条件更新 Query(“Student”).whereByColumFilters([WhereCondiction(“studentId”, WhereCondictionType.LESS_THEN, 5),WhereCondiction(“score”, WhereCondictionType.EQ_OR_MORE_THEN, 0)]).update({“score”:100}); 根据自定义where sql更新 Query(“Student”).whereBySql(“studentId <= ? and score <= ?”, [5,100]).update({“score”:0}); 删除数据全部删除 Query(“Student”).delete(); 根据主键删除 Query(“Student”).primaryKey([1,3,5]).delete(); 根据条件删除 Query(“Student”).whereByColumFilters([WhereCondiction(“studentId”, WhereCondictionType.IN, [1,3,5])]).delete();根据自定义where sql删除 Query(“Student”).whereBySql(“studentId in (?,?,?)”, [1,3,5]).delete();联表查询inner join JoinCondiction c = new JoinCondiction(“Match”); c.type = JoinType.INNER; c.matchColumns = {“studentId”: “winnerId”}; Query(“Student”).join(c).all().then((List l) { }); left join JoinCondiction c = new JoinCondiction(“Match”); c.type = JoinType.LEFT; c.matchColumns = {“studentId”: “winnerId”}; Query(“Student”).join(c).all().then((List l) { }); 利用外键联表 JoinCondiction c = new JoinCondiction(“Class”); c.type = JoinType.INNER; Query(“Student”).join(c).all().then((List l) { }); where sql 联表 JoinCondiction c = new JoinCondiction(“Match”); c.type = JoinType.INNER; c.matchColumns = {“studentId”: “winnerId”}; Query(“Student”).join(c).whereBySql(“Student.score > ?”,[60]).all().then((List l) { }); 部分column 联表查询 JoinCondiction c = new JoinCondiction(“Match”); c.type = JoinType.INNER; c.matchColumns = {“studentId”: “winnerId”}; Query(“Student”).join(c).needColums([“name”,“score”]).all().then((List l) { }); group by 、having 联表查询 JoinCondiction c = new JoinCondiction(“Class”); c.type = JoinType.INNER; Query(“Student”).join(c).needColums([“class”]).groupBy([“Student.class”]).havingByBindings(“avg(Student.score) > ?”, [40]).all().then((List l) { }); order by 联表查询 JoinCondiction c = new JoinCondiction(“Class”); c.type = JoinType.INNER; Query(“Student”).join(c).orderBy([“Student.score desc”]).all().then((List l) { }); 使用介绍flutter_orm_plugin 已经发布到flutter 插件仓库。只要简单配置即可使用，在yaml文件中加上flutter_orm_plugin依赖以及orm框架所需要的lua源文件，flutter_orm_plugin会对所有lua代码进行封装，最终使用只需要关心dart接口，对lua是无感的。 flutter_orm_plugin: ^1.0.0 . . . assets: - packages/flutter_orm_plugin/lua/DB.lua - packages/flutter_orm_plugin/lua/orm/model.lua - packages/flutter_orm_plugin/lua/orm/cache.lua - packages/flutter_orm_plugin/lua/orm/dbData.lua - packages/flutter_orm_plugin/lua/orm/tools/fields.lua - packages/flutter_orm_plugin/lua/orm/tools/func.lua - packages/flutter_orm_plugin/lua/orm/class/fields.lua - packages/flutter_orm_plugin/lua/orm/class/global.lua - packages/flutter_orm_plugin/lua/orm/class/property.lua - packages/flutter_orm_plugin/lua/orm/class/query.lua - packages/flutter_orm_plugin/lua/orm/class/query_list.lua - packages/flutter_orm_plugin/lua/orm/class/select.lua - packages/flutter_orm_plugin/lua/orm/class/table.lua - packages/flutter_orm_plugin/lua/orm/class/type.lua 在ios项目podfile加上luakit 依赖source ‘https://github.com/williamwen1986/LuakitPod.git'source ‘https://github.com/williamwen1986/curl.git'...pod ‘curl’, ‘> 1.0.0’pod ‘LuakitPod’, ‘> 1.0.17’在android项目app的build.gradle加上luakit依赖repositories { maven { url “https://jitpack.io” }}…implementation ‘com.github.williamwen1986:LuakitJitpack:1.0.9’完成配置即可使用。
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