使用第三方类库FMDB封装数据请求类，实现数据分页请求，上拉刷新下拉加载####
- 实现功能：添加问题和答案，删除问题，查询问题
- 实现方法：使用SQLite，建三个键值letter（大写字母）、question(问题)、answer（答案）。
FMDBDataBase.h代码如下：
@class QuestionsAndAnswers;
@interface FMDBDataBase : NSObject
singleton_interface(FMDBDataBase)
//打开数据库
- (void)openDataBase;
//关闭数据库
- (void)closeDataBase;
//增
- (void)insertData:(QuestionsAndAnswers *)QuestionsAndAnswers;
// 加强版增加
- (void)insertData:(QuestionsAndAnswers * _Nonnull)questionsandanswers
success:(nullable void (^)(id _Nullable responseObject))success
failure:(nullable void (^)(id _Nullable errorObject))failure
fromClassName:(NSString * _Nonnull)className;
//删
- (void)deleteData:(NSString *)question;
// 删除增强版
- (void)deleteData:(NSString *_Nonnull)question
success:(nullable void (^)(id _Nullable responseObject))success
failure:(nullable void (^)(id _Nullable errorObject))failure
fromClassName:(NSString * _Nonnull)className;
//查
- (NSArray *)queryData;
// 查询增强版
- (void)queryDataWithPram:(NSDictionary *_Nonnull)dict
success:(nullable void (^)(id _Nullable responseObject))success
failure:(nullable void (^)(id _Nullable errorObject))failure
fromClassName:(NSString * _Nonnull)className;
//改
//- (void)updateData:(NSString *)question name:(NSString *)answer;
FMDBDataBase.m代码如下：
#import "QuestionsAndAnswers.h"
@implementation FMDBDataBase
singleton_implementation(FMDBDataBase)
//创建数据库对象
static FMDatabase *db = nil;
//打开数据库
- (void)openDataBase{
//创建文件路径
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
documentPath = [documentPath stringByAppendingString:@"/questionsandanswers.sqlite"];
NSLog(@"%@",documentPath);
//创建数据库
db = [FMDatabase databaseWithPath:documentPath];
//打开数据库，并判断是否打开了数据库 open 的返回类型是BOOL
if ([db open]) {
NSLog(@"数据库打开成功");
NSString *sql = @"CREATE TABLE IF NOT EXISTS questionsandanswers (question_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE, letter TEXT NOT NULL, question TEXT NOT NULL, answer TEXT NOT NULL)";
BOOL result = [db executeUpdate:sql];
if (result) {
NSLog(@"创表成功");
[KVNProgress showSuccessWithStatus:@"打开数据库并创建表成功"];
}else{
NSLog(@"创表失败");
}
}else{
NSLog(@"数据库打开失败");
}
}
//关闭数据库
- (void)closeDataBase{
//关闭数据库
NSLog(@"关闭数据库");
[db close];
}
//增
- (void)insertData:(QuestionsAndAnswers *)questionsandanswers{
[db open];
NSMutableArray *array = [NSMutableArray array];
FMResultSet *set = [db executeQuery:@"select *from questionsandanswers"];
while ([set next]) {
NSString *question = [set stringForColumn:@"question"];
NSLog(@"%@",question);
[array addObject:question];
}
// 如果数据库已经包含了这条数据，就不增加
if ([array containsObject:questionsandanswers.question]) {
return;
}else{
// 获取问题的拼音
NSString *str = [FMDBDataBase transform:questionsandanswers.question];
str = [str substringToIndex:1];
NSString *letter = [str uppercaseString]; // 取拼音的首字符大写
NSLog(@"首字母：%@，问题：%@，答案：%@",letter,questionsandanswers.question,questionsandanswers.answer);
[db executeUpdate:@"insert into questionsandanswers (letter,question,answer) values(?,?,?)",letter,questionsandanswers.question,questionsandanswers.answer];
}
}
// 加强版增加
- (void)insertData:(QuestionsAndAnswers * _Nonnull)questionsandanswers
success:(nullable void (^)(id _Nullable responseObject))success
failure:(nullable void (^)(id _Nullable errorObject))failure
fromClassName:(NSString * _Nonnull)className{
BOOL openData = [db open];
if (openData) {
NSMutableArray *array = [NSMutableArray array];
FMResultSet *set = [db executeQuery:@"select *from questionsandanswers"];
while ([set next]) {
NSString *question = [set stringForColumn:@"question"];
NSLog(@"%@",question);
[array addObject:question];
}
if ([array containsObject:questionsandanswers.question]) {
if (failure) {
failure(@"数据库中此问题已存在！");
}
return;
}else{
NSString *str = [FMDBDataBase transform:questionsandanswers.question];
str = [str substringToIndex:1];
NSString *letter = [str uppercaseString];
NSLog(@"首字母：%@，问题：%@，答案：%@",letter,questionsandanswers.question,questionsandanswers.answer);
BOOL suc = [db executeUpdate:@"insert into questionsandanswers (letter,question,answer) values(?,?,?)",letter,questionsandanswers.question,questionsandanswers.answer];
if (suc) {
if (success) {
NSDictionary *dict = @{@"status":@"0",@"info":@"数据添加成功！"};
NSLog(@"%@\\n传参：%@\\n回参：%@", className, questionsandanswers,dict);
success(dict);
}
}else{
if (success) {
NSDictionary *dict = @{@"status":@"1",@"msg":@"数据添加失败！"};
NSLog(@"%@\\n传参：%@\\n回参：%@", className, questionsandanswers,dict);
success(dict);
}
}
}
}else{
if (failure) {
failure(@"打开数据库失败！");
}
}
}
//删
- (void)deleteData:(NSString *)question{
[db open];
[db executeUpdate:@"delete from questionsandanswers where question = ?",question];
}
- (void)deleteData:(NSString *_Nonnull)question
success:(nullable void (^)(id _Nullable responseObject))success
failure:(nullable void (^)(id _Nullable errorObject))failure
fromClassName:(NSString * _Nonnull)className{
BOOL openData = [db open];
if (openData) {
BOOL suc = [db executeUpdate:@"delete from questionsandanswers where question = ?",question];
if (suc) {
if (success) {
NSDictionary *dict = @{@"status":@"0",@"info":@"数据删除成功！"};
NSLog(@"%@\\n传参：%@\\n回参：%@", className, question,dict);
success(dict);
}
}else{
if (success) {
NSDictionary *dict = @{@"status":@"1",@"msg":@"数据删除失败！"};
NSLog(@"%@\\n传参：%@\\n回参：%@", className, question,dict);
success(dict);
}
}
}else{
if (failure) {
failure(@"打开数据库失败！");
}
}
}
//查
- (NSArray *)queryData{
[db open];
NSMutableArray *array = [NSMutableArray array];
FMResultSet *set = [db executeQuery:@"select *from questionsandanswers"];
while ([set next]) {
QuestionsAndAnswers *questionsandanswers = [QuestionsAndAnswers new];
questionsandanswers.letter = [set stringForColumn:@"letter"];
questionsandanswers.question = [set stringForColumn:@"question"];
questionsandanswers.answer = [set stringForColumn:@"answer"];
// NSLog(@"%@",questionsandanswers);
[array addObject:questionsandanswers];
}
return array;
}
// 增强版查询数据，添加了分页，一页10条数据
- (void)queryDataWithPram:(NSDictionary *_Nonnull)dict
success:(nullable void (^)(id _Nullable responseObject))success
failure:(nullable void (^)(id _Nullable errorObject))failure
fromClassName:(NSString * _Nonnull)className{
BOOL openData = [db open];
if (openData) {
NSMutableArray *array = [NSMutableArray array];
NSMutableArray *allArray = [NSMutableArray array];
FMResultSet *set = [db executeQuery:@"select *from questionsandanswers"];
while ([set next]) {
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
[dictionary setObject:[set stringForColumn:@"letter"] forKey:@"letter"];
[dictionary setObject:[set stringForColumn:@"question"] forKey:@"question"];
[dictionary setObject:[set stringForColumn:@"answer"] forKey:@"answer"];
[allArray addObject:dictionary];
}
NSInteger allData = allArray.count;
for (int i = 0; i < allData; i++) {
NSInteger num = 10*[dict[@"page"] integerValue];
// 返回的数据要小于分页数据
if (array.count >= num) {
break;
}
[array addObject:allArray[i]];
}
NSInteger arrayCount = array.count;
// 当查询到所有数据之后的操作
if (array.count == allData) {
if (failure) {
failure(@"没有更多数据啦！");
}
}
// while ([set next]) {
//
// NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
//// QuestionsAndAnswers *questionsandanswers = [QuestionsAndAnswers new];
//// questionsandanswers.letter = [set stringForColumn:@"letter"];
//// questionsandanswers.question = [set stringForColumn:@"question"];
//// questionsandanswers.answer = [set stringForColumn:@"answer"];
//
// [dictionary setObject:[set stringForColumn:@"letter"] forKey:@"letter"];
// [dictionary setObject:[set stringForColumn:@"question"] forKey:@"question"];
// [dictionary setObject:[set stringForColumn:@"answer"] forKey:@"answer"];
//
//
//
// NSInteger num = 10*[dict[@"page"] integerValue];
// if (array.count >= num) {
//
// break;
// }
//
// [array addObject:dictionary];
//
// }
BOOL countMoreZero = array.count;
if (countMoreZero) {
// 拼接数据返回
if (success) {
NSMutableDictionary *responseOb = [NSMutableDictionary dictionary];
[responseOb setObject:@"0" forKey:@"status"];
[responseOb setObject:array forKey:@"info"];
[responseOb setObject:[NSString stringWithFormat:@"%ld",allData] forKey:@"allData"];
NSLog(@"%@\\n传参：%@\\n回参：%@", className, dict,responseOb);
success(responseOb);
}
}else{
if (success) {
NSDictionary *responseOb = @{@"status":@"1",@"msg":@"数据库没有数据！"};
NSLog(@"%@\\n传参：%@\\n回参：%@", className, dict,responseOb);
success(responseOb);
}
}
}else{
if (failure) {
failure(@"打开数据库失败！");
}
}
}
// 汉字转拼音
+ (NSString *)transform:(NSString *)chinese{
//将NSString装换成NSMutableString
NSMutableString *pinyin = [chinese mutableCopy];
//将汉字转换为拼音(带音标)
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformMandarinLatin, NO);
NSLog(@"%@", pinyin);
//去掉拼音的音标
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformStripCombiningMarks, NO);
NSLog(@"%@", pinyin);
//返回最近结果
return pinyin;
}
使用起来和AFNetWorking类似####
分页刷新
// 数据刷新
@property (assign, nonatomic) NSInteger page;
@property (assign, nonatomic) NSInteger totalNum;
@property (assign, nonatomic) NSInteger from;
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
NSLog(@"%@",documentPath);
self.from = 1;
self.dataArray = [NSMutableArray array];
// 打开数据库
[[FMDBDataBase sharedFMDBDataBase] openDataBase];
[self layoutViews]；
}
#pragma mark--------刷新--------
- (void)loadNewData
{
self.page = self.from;
[self loadData];
}
// 加载更多数据
- (void)loadMoreData
{
self.page++;
[self loadData];
}
- (void)loadData
{
NSDictionary *dict = @{@"page":[NSString stringWithFormat:@"%ld",self.page]};
[[FMDBDataBase sharedFMDBDataBase] queryDataWithPram:dict success:^(id _Nullable responseObject) {
if ([responseObject[@"status"] isEqualToString:@"0"]) {
// if ([self.showTableView.mj_header isRefreshing]) {
//
// [self.dataArray removeAllObjects];
// }
NSMutableArray *shoArr = [NSMutableArray array];
self.totalNum = [responseObject[@"allData"] integerValue];
NSArray *array = responseObject[@"info"];
for (NSDictionary *dicc in array) {
QuestionsAndAnswers *questAnser = [[QuestionsAndAnswers alloc]initWithDictionary:dicc];
if (shoArr.count >= self.totalNum) {
break;
}
[shoArr addObject:questAnser];
}
NSLog(@"dataArray:%@",self.dataArray);
self.dataArray = shoArr;
[self.showTableView reloadData];
[self.showTableView.mj_header endRefreshing];
[self.showTableView.mj_footer endRefreshing];
}else{
[KVNProgress showErrorWithStatus:responseObject[@"msg"]];
[self.showTableView.mj_header endRefreshing];
[self.showTableView.mj_footer endRefreshing];
}
} failure:^(id _Nullable errorObject) {
[KVNProgress showErrorWithStatus:errorObject];
[self.showTableView.mj_header endRefreshing];
[self.showTableView.mj_footer endRefreshing];
} fromClassName:NSStringFromClass([self class])];
}
- (void)setTotalNum:(NSInteger)totalNum
{
_totalNum = totalNum;
if (self.dataArray.count >= _totalNum) {
[self.showTableView.mj_footer endRefreshingWithNoMoreData];
}
else
[self.showTableView.mj_footer resetNoMoreData];
}
- (void)layoutViews{
self.showTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 64, k_width, k_height-64) style:UITableViewStylePlain];
[self.view addSubview:self.showTableView];
self.showTableView.delegate = self;
self.showTableView.dataSource = self;
[self.view addSubview:self.showTableView];
self.showTableView.mj_header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(loadNewData)];
self.showTableView.mj_footer = [MJRefreshBackNormalFooter footerWithRefreshingTarget:self refreshingAction:@selector(loadMoreData)];
[self.showTableView.mj_header beginRefreshing];
}
