基于Swift使用FMDB实现(增删改查+搜索+聊天置顶+分页读取)

Pod引入FMDB框架(记得加use_frameworks!),引入头文件import FMDB

写一个DBManager类

class DBManager: NSObject { static let shareManager = DBManager() var dbQueue: FMDatabaseQueue? func openDB() { let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first let userPath = documentDirectory?.stringByAppendingPathComponent(path: "data10001") if !FileManager.default.fileExists(atPath: userPath!) { guard ((try? FileManager.default.createDirectory(atPath: userPath!, withIntermediateDirectories: false, attributes: nil)) != nil) else { return } } let fileName = userPath?.stringByAppendingPathComponent(path: "person.db") dbQueue = FMDatabaseQueue(path: fileName) } } extension String { //给String扩展一个stringByAppendingPathComponent方法 func stringByAppendingPathComponent(path: String) -> String { let nsString = self as NSString return nsString.appendingPathComponent(path) } }

每一张表写一个DAO(Data Access Object),写sql语句操作数据库,暴露接口,例如TABLE_LIST表的ListDAO的部分代码

/// 单例 static let shareDAO = ListDAO() /// 创建表 func creatTable() { let sqlString = "CREATE TABLE IF NOT EXISTS TABLE_LIST('personId' Integer Integer PRIMARY KEY NOT NULL, 'name' Text, 'isTop' Integer)" //字段的单引号可有可没有,添加主键防止重复添加 DBManager.shareManager.dbQueue?.inDatabase({ (db) in guard (db?.executeUpdate(sqlString, withArgumentsIn: [])) != nil else { return } }) } /// 删除表 func dropTable() { let sqlString = "DROP TABLE TABLE_LIST" DBManager.shareManager.dbQueue?.inDatabase({ (db) in guard (db?.executeUpdate(sqlString, withArgumentsIn: [])) != nil else { return } }) } /// 插入数据 func insertData(model: ListModel) { let sqlString = "INSERT OR REPLACE INTO TABLE_LIST(personId, name, isTop) values (?,?,?)" DBManager.shareManager.dbQueue?.inDatabase({ (db) in guard (db?.executeUpdate(sqlString, withArgumentsIn: [model.personId, model.name, model.isTop]))! else { return } }) } /// 获取数据(已经置顶) func getDataList() -> Array<ListModel> { var resultArray = Array<Any>() DBManager.shareManager.dbQueue?.inDatabase({ (db) in //无条件全量查找 //let sqlString = "SELECT * FROM TABLE_LIST"; //根据isTop字段降序输出 let sqlString = "SELECT * FROM TABLE_LIST ORDER BY isTop DESC"; guard let set = try? db?.executeQuery(sqlString, values: []) else { return } while (set?.next())! { let model = ListModel() model.personId = Int((set?.int(forColumn: "personId"))!) model.name = set?.string(forColumn: "name") model.isTop = (set?.bool(forColumn: "isTop"))! resultArray.append(model) } set?.close() }) return resultArray as! Array<ListModel> } /// 删除单条数据 func deleteDataOfDataList(personId: Int) -> Bool { var result: Bool = false DBManager.shareManager.dbQueue?.inDatabase({ (db) in let sqlString = "DELETE FROM TABLE_LIST WHERE personId = ?" result = (db?.executeUpdate(sqlString, withArgumentsIn: [personId]))! }) return result } /// 置顶操作 func setTopWithPersonId(personId: Int, isTop: Bool) -> Bool { var result: Bool = false DBManager.shareManager.dbQueue?.inDatabase({ (db) in let sqlString = "UPDATE TABLE_LIST SET isTop = ? WHERE personId = ?" result = (db?.executeUpdate(sqlString, withArgumentsIn: [isTop,personId]))! }) return result }

TABLE_DETAIL表的DetailDAO的部分代码

/// 查询数据(全量获取) func getDataListWithString(string: String) -> Array<Any> { var resultArray = Array<Any>() DBManager.shareManager.dbQueue?.inDatabase({ (db) in // LIKE '%Java%'查询des字段中包含Java的, LIKE 'Java*' 查询以Java开头的, '*Java查询以Java结尾的' // 查询 TABLE_DETAIL 表中包含string的model let sqlString = "SELECT * FROM TABLE_DETAIL WHERE des LIKE '%" + string + "%'" guard let set = try? db?.executeQuery(sqlString, values: []) else { return } while (set?.next())! { let model = DetailModel() model.desId = Int((set?.int(forColumn: "desId"))!) model.des = set?.string(forColumn: "des") resultArray.append(model) } set?.close() }) return resultArray } /// 分页获取数据(分页读取,每次20条) func pageReadDataListWith(page: Int) -> Array<Any> { var resultArray = Array<Any>() DBManager.shareManager.dbQueue?.inDatabase({ (db) in var sqlString = String() if page != 1 { // TABLE_DETAIL AS TD: 为TABLE_DETAIL起个别名TD // TD.desId>\(page * 20): 查询TD.desId大于当前的数据 // ORDER BY TD.desId ASC: 根据TD.desId升序 // LIMIT 0,20: 每次获取20条数据 sqlString = "SELECT * FROM TABLE_DETAIL AS TD WHERE TD.desId>\(page * 20) ORDER BY TD.desId ASC LIMIT 0,20" } else { // ASC 升序(默认) DESC 降序 sqlString = "SELECT * FROM TABLE_DETAIL AS TD ORDER BY TD.desId ASC LIMIT 1,20" } guard let set = try? db?.executeQuery(sqlString, values: []) else { return } while (set?.next())! { let model = DetailModel() model.desId = Int((set?.int(forColumn: "desId"))!) model.des = set?.string(forColumn: "des") resultArray.append(model) } set?.close() }) return resultArray }

DEMO效果

DEMO地址