描述

这是一个简易的ORM工具,只需要几步就可以完成对单表的CRUD操作.

建立模型

@interface Users : FMDTObject

@property (nonatomic, assign) NSInteger userId;
@property (nonatomic, strong) NSString *nickname;
@property (nonatomic, strong) NSString *sex;
@property (nonatomic, strong) NSDictionary *other;

@end

@interface Message : FMDTObject

@property (nonatomic, strong) NSString *mid;
@property (nonatomic, strong) NSString *text;
@property (nonatomic, strong) NSDate *createdAt;

@end

设置FMDTContext管理类

@interface DBSet : FMDTManager

@property (nonatomic, strong, readonly) FMDTContext *user;

- (FMDTContext *)dynamicTable:(NSString *)name;

@end


@implementation DBSet

- (FMDTContext *)user {
    /**
     *  缓存FMDTContext对象,第一次创建时会自动生成表结构
     *  默认存储在默认会存储在沙盒下的Library/Caches/{Bundle Identifier}.db,
     *  如果想要对每一个用户生成一个库,可以自定义Path,
     *  使用[self cacheWithClass: dbPath:]方法
     */
    return [self cacheWithClass:[Users class]];
}

- (FMDTContext *)dynamicTable:(NSString *)name {
    
    /**
     *  设置将对象映射到不同的数据表
     */
    return [self cacheWithClass:[Message class] tableName:name];
}

@end

#添加数据

//创建插入对象
FMDTInsertCommand *icmd = [[DBSet shared].user createInsertCommand];
//添加要插入的对象集合
[icmd addWithArray:userArray];
//设置添加操作是否使用replace语句
[icmd setRelpace:YES];
//执行插入操作
[icmd saveChangesInBackground:^{
    NSLog(@"批量数据提交完成");
}];

#更新数据

//通过对象更新数据
FMDTUpdateObjectCommand *ucmd1 = [[DBSet shared].user createUpdateObjectCommand];

//添加要更新的对象
[ucmd1 add:userObjct];
//执行更新操作
[ucmd1 saveChangesInBackground:^{
    NSLog(@"更新完成");
}];

//通过条件更新数据
FMDTUpdateCommand *ucmd2 = [[DBSet shared].user createUpdateCommand];
//设置要更新的字段与值
[ucmd2 fieldWithKey:@"nickname" val:@"小红"];
//设置更新条件
[ucmd2 where:@"userId" equalTo:@(2)];
//执行更新操作
[ucmd2 saveChanges];

#删除数据

FMDTDeleteCommand *dcmd = FMDT_DELETE([DBSet shared].user);
//设置条件
[dcmd where:@"userId" greaterThan:@"50"];
//执行删除操作
[dcmd saveChanges];

#查询数据

//查询数据
FMDTSelectCommand *cmd = [[DBSet shared].user createSelectCommand];

//单一条件查询
//SQL:select * from [Users] where sex = '男'
[cmd where:@"sex" equalTo:@"男"];
[cmd fetchArray];

//多条件And查询
//SQL:select * from [Users] where sex = '男' and nickname like '%1%'
[cmd where:@"sex" equalTo:@"男"];
[cmd where:@"nickname" containsString:@"%1%"];
[cmd fetchArray];

//多条件Or查询
//SQL:select * from [Users] where nickname like '%1%' or sex = '男'
[cmd where:@"nickname" containsString:@"%1%"];
[cmd whereOr:@"sex" equalTo:@"男"];
[cmd fetchArray];

//In
//SQL:select count(*) from Users where sex in ('女','男')
[cmd where:@"sex" containedIn:@[ @"女", @"男"]];
[cmd fetchArray];

//Not In
//SQL:select count(*) from Users where sex not in ('女','男')
[cmd where:@"sex" notContainedIn:@[ @"女", @"男"]];
[cmd fetchArray];

//Like
//SQL:select * from [Users] where nickname like '%1%'
[cmd where:@"nickname" containsString:@"%1%"];
[cmd fetchArray];

//Not Like
//SQL:select * from [Users] where nickname not like '%1%'
[cmd where:@"nickname" notContainsString:@"%1%"];
[cmd fetchArray];

// <
//SQL:select * from Users where  userId < '30'
[cmd where:@"userId" lessThan:@(30)];
[cmd fetchArray];

// <=
//SQL:select * from Users where  userId <= '30'
[cmd where:@"userId" lessThanOrEqualTo:@(30)];
[cmd fetchArray];

// >
//SQL:select * from Users where  userId > '30'
[cmd where:@"userId" greaterThan:@(30)];
[cmd fetchArray];

// >=
//SQL:select * from Users where  userId >= '30'
[cmd where:@"userId" greaterThanOrEqualTo:@(30)];
[cmd fetchArray];

//排序 ascending.
//SQL:select * from Users order by userId asc
[cmd orderByAscending:@"userId"];
[cmd fetchArray];

//排序 descending.
//SQL:select * from Users order by userId desc
[cmd orderByDescending:@"userId"];
[cmd fetchArray];

//获取前10条
//SQL:select * from Users limit 10
[cmd setLimit:10];
[cmd fetchArray];

//分页获取数据
//SQL:select * from Users limit 10 offset 10
[cmd setLimit:10];
[cmd setSkip:10];
[cmd fetchArray];

Installation

pod 'FMDBDataTable', '~> 2.0.2'