首先
导入FMDB
并添加FMDB依赖库（labslite3.0）
创建model类 如图
紧接着创建业务处理层
如图
代码如下
+(instancetype)shareLoadData;
//创建表
-(void)createTable;
//添加数据
-(void)addData:(Student *)stu;
//修改数据
-(void)updateData:(Student *)stu;
//删除数据
-(void)deleteData:(NSInteger)idl;
//查询数据
-(NSMutableArray*)showAllData;
//查询第一个数据
-(NSMutableArray *)showTop1Data;
//查询理论分数最高分
-(NSMutableArray *)showTheoryMaxData;
//查询技能分数最高分
-(NSMutableArray *)showComputerMaxData;
//删除理论分数最低分
-(NSMutableArray *)deleteTheoryMinData;
接下来
#import "LoadData.h"
static LoadData *load;
@interface LoadData ()
@property (nonatomic, strong) FMDatabase *db;
@end
@implementation LoadData
+(instancetype)shareLoadData{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
load = [[LoadData alloc] init];
});
return load;
}
+(instancetype)allocWithZone:(struct _NSZone *)zone{
if (!load) {
load = [super allocWithZone:zone];
}
return load;
}
//创建表
-(void)createTable{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *dbPath = [path stringByAppendingString:@"/wx.db"];
_db = [[FMDatabase alloc] initWithPath:dbPath];
if ([_db open]) {
NSString *createTable = [NSString stringWithFormat:@"create table student(stuID integer primary key,stuName text,stuNumber text,stuTheory text,stuComputer text,stuRemarks text)"];
if ([_db executeUpdate:createTable]) {
NSLog(@"创建表成功!");
[_db close];
}
}
}
//添加数据
-(void)addData:(Student *)stu{
if ([_db open]) {
NSString *addData = [NSString stringWithFormat:@"insert into student(stuName,stuNumber,stuTheory,stuComputer,stuRemarks)values(%@,%@,%@,%@,%@)",stu.stuName,stu.stuNumber,stu.stuTheory,stu.stuComputer,stu.stuRemarks];
if ([_db executeUpdate:addData]) {
NSLog(@"数据添加成功");
[_db close];
}
}
}
//修改数据
-(void)updateData:(Student *)stu{
if ([_db open]) {
NSString *updateData = [NSString stringWithFormat:@"update student set stuName = %@,stuNumber = %@,stuTheory = %@,stuComputer = %@,stuRemarks = %@ where stuID = %ld",stu.stuName,stu.stuNumber,stu.stuTheory,stu.stuComputer,stu.stuRemarks,stu.stuID];
if ([_db executeUpdate:updateData]) {
NSLog(@"数据修改成功");
[_db close];
}
}
}
//删除数据
-(void)deleteData:(NSInteger)idl{
if ([_db open]) {
NSString *deleteData = [NSString stringWithFormat:@"delete from student where stuID = %ld",idl];
if ([_db executeUpdate:deleteData]) {
NSLog(@"数据删除成功");
[_db close];
}
}
}
//查询数据
-(NSMutableArray*)showAllData{
NSMutableArray *arr = [NSMutableArray array];
if ([_db open]) {
NSString *selectAllData = [NSString stringWithFormat:@"select * from student"];
FMResultSet *re = [_db executeQuery:selectAllData];
while ([re next]) {
Student *stu = [[Student alloc] init];
stu.stuID = [re intForColumn:@"stuID"];
stu.stuName = [re stringForColumn:@"stuName"];
stu.stuNumber = [re stringForColumn:@"stuNumber"];
stu.stuTheory = [re stringForColumn:@"stuTheory"];
stu.stuComputer = [re stringForColumn:@"stuComputer"];
stu.stuRemarks = [re stringForColumn:@"stuRemarks"];
[arr addObject:stu];
}
[_db close];
}
return arr;
}
//查询第一个数据
-(NSMutableArray *)showTop1Data{
NSMutableArray *arr = [NSMutableArray array];
if ([_db open]) {
NSString *selectAllData = [NSString stringWithFormat:@"select * from student where stuID = 1"];
FMResultSet *re = [_db executeQuery:selectAllData];
NSLog(@"%@",re);
while ([re next]) {
Student *stu = [[Student alloc] init];
stu.stuID = [re intForColumn:@"stuID"];
stu.stuName = [re stringForColumn:@"stuName"];
stu.stuNumber = [re stringForColumn:@"stuNumber"];
stu.stuTheory = [re stringForColumn:@"stuTheory"];
stu.stuComputer = [re stringForColumn:@"stuComputer"];
stu.stuRemarks = [re stringForColumn:@"stuRemarks"];
[arr addObject:stu];
}
[_db close];
NSLog(@"查询第一个数据成功");
}
return arr;
}
//查询理论分数最高分
-(NSMutableArray *)showTheoryMaxData{
NSMutableArray *arr = [NSMutableArray array];
if ([_db open]) {
NSString *selectAllData = [NSString stringWithFormat:@"select * from student where stuTheory in (select max(stuTheory) from student)"];
FMResultSet *re = [_db executeQuery:selectAllData];
while ([re next]) {
Student *stu = [[Student alloc] init];
stu.stuID = [re intForColumn:@"stuID"];
stu.stuName = [re stringForColumn:@"stuName"];
stu.stuNumber = [re stringForColumn:@"stuNumber"];
stu.stuTheory = [re stringForColumn:@"stuTheory"];
stu.stuComputer = [re stringForColumn:@"stuComputer"];
stu.stuRemarks = [re stringForColumn:@"stuRemarks"];
[arr addObject:stu];
}
[_db close];
NSLog(@"查询理论分数最高分成功");
}
return arr;
}
//查询技能分数最高分
-(NSMutableArray *)showComputerMaxData{
NSMutableArray *arr = [NSMutableArray array];
if ([_db open]) {
NSString *selectAllData = [NSString stringWithFormat:@"select * from student where stuComputer in (select max(stuComputer) from student)"];
FMResultSet *re = [_db executeQuery:selectAllData];
while ([re next]) {
Student *stu = [[Student alloc] init];
stu.stuID = [re intForColumn:@"stuID"];
stu.stuName = [re stringForColumn:@"stuName"];
stu.stuNumber = [re stringForColumn:@"stuNumber"];
stu.stuTheory = [re stringForColumn:@"stuTheory"];
stu.stuComputer = [re stringForColumn:@"stuComputer"];
stu.stuRemarks = [re stringForColumn:@"stuRemarks"];
[arr addObject:stu];
}
NSLog(@"查询技能分数最高分成功");
[_db close];
}
return arr;
}
//删除理论分数最低分
-(NSMutableArray *)deleteTheoryMinData{
NSMutableArray *arr = [NSMutableArray array];
if ([_db open]) {
NSString *selectAllData = [NSString stringWithFormat:@"select * from student where stuTheory in (select min(stuTheory) from student)"];
FMResultSet *re = [_db executeQuery:selectAllData];
Student *stu = [[Student alloc] init];
while ([re next]) {
stu.stuID = [re intForColumn:@"stuID"];
stu.stuName = [re stringForColumn:@"stuName"];
stu.stuNumber = [re stringForColumn:@"stuNumber"];
stu.stuTheory = [re stringForColumn:@"stuTheory"];
stu.stuComputer = [re stringForColumn:@"stuComputer"];
stu.stuRemarks = [re stringForColumn:@"stuRemarks"];
}
NSString *deleteTheoryMinData = [NSString stringWithFormat:@"delete from student where stuID = %ld",stu.stuID];
if ([_db executeUpdate:deleteTheoryMinData]) {
NSLog(@"删除理论成绩分数最低");
}
NSString *select1AllData = [NSString stringWithFormat:@"select * from student"];
FMResultSet *re1 = [_db executeQuery:select1AllData];
while ([re1 next]) {
Student *stu1 = [[Student alloc] init];
stu1.stuID = [re1 intForColumn:@"stuID"];
stu1.stuName = [re1 stringForColumn:@"stuName"];
stu1.stuNumber = [re1 stringForColumn:@"stuNumber"];
stu1.stuTheory = [re1 stringForColumn:@"stuTheory"];
stu1.stuComputer = [re1 stringForColumn:@"stuComputer"];
stu1.stuRemarks = [re1 stringForColumn:@"stuRemarks"];
[arr addObject:stu1];
}
[_db close];
}
return arr;
}
@end
-————————————————————————————
接下来用导航栏实现跳转
在APPDelegate里
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
MyTableViewController *vc = [[MyTableViewController alloc] initWithStyle:UITableViewStyleGrouped];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
self.window.rootViewController = nav;
return YES;
}
————————————————————————————
然后在现实界面写
Vi e w C o n t ro l l.m里写：
#import "MyTableViewController.h"
#import "AddViewController.h"
#import "LoadData.h"
@interface MyTableViewController ()
{
NSMutableArray *arr;
}
@end
@implementation MyTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
[[LoadData shareLoadData] createTable];
self.title = @"学生信心";
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"添加数据" style:UIBarButtonItemStylePlain target:self action:@selector(addClicked)];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"查询数据" style:UIBarButtonItemStylePlain target:self action:@selector(showAllData)];
}
-(void)viewDidAppear:(BOOL)animated{
arr =[[LoadData shareLoadData] showAllData];
[self.tableView reloadData];
}
-(void)addClicked{
AddViewController *vc = [[AddViewController alloc] init];
vc.idl = 0;
[self.navigationController pushViewController:vc animated:YES];
}
#if 0
-(void)showAllData{
//查询第一个数据
arr = [[LoadData shareLoadData] showTop1Data];
[self.tableView reloadData];
}
#elif 0
-(void)showAllData{
//查询理论成绩最高的学生
arr = [[LoadData shareLoadData] showTheoryMaxData];
[self.tableView reloadData];
}
#elif 0
-(void)showAllData{
//查询机试成绩最高的学生
arr = [[LoadData shareLoadData] showComputerMaxData];
[self.tableView reloadData];
}
#elif 0
-(void)showAllData{
//删除理论成绩最低分的纪录
arr = [[LoadData shareLoadData] deleteTheoryMinData];
[self.tableView reloadData];
}
#endif
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
#warning Incomplete implementation, return the number of sections
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
#warning Incomplete implementation, return the number of rows
return arr.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *str = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:str];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:str];
}
cell.textLabel.text = [arr[indexPath.row] stuName];
cell.detailTextLabel.text = [arr[indexPath.row] stuNumber];
return cell;
}
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
[[LoadData shareLoadData] deleteData:[arr[indexPath.row] stuID]];
[arr removeObjectAtIndex:indexPath.row];
[self.tableView reloadData];
}
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
AddViewController *vc = [[AddViewController alloc] init];
vc.idl = 1;
vc.st = arr[indexPath.row];
[self.navigationController pushViewController:vc animated:YES];
}
————————————————————————————
接下来在AddViewControl .h里
#import#import "Student.h"
#import "LoadData.h"
@interface AddViewController : UIViewController
@property (nonatomic, assign) NSInteger idl;
@property (nonatomic, strong) Student *st;
@end
————————————————————————————
.m里写
#import "AddViewController.h"
@interface AddViewController ()
@property (weak, nonatomic) IBOutlet UITextField *stuNameText;
@property (weak, nonatomic) IBOutlet UITextField *stuNumberText;
@property (weak, nonatomic) IBOutlet UITextField *stuTheoryText;
@property (weak, nonatomic) IBOutlet UITextField *stuComputerText;
@property (weak, nonatomic) IBOutlet UITextField *stuRemarksText;
@property (weak, nonatomic) IBOutlet UIButton *addButton;
@end
@implementation AddViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
if (self.idl == 0) {
[_addButton setTitle:@"添加数据" forState:UIControlStateNormal];
}else{
self.stuNameText.text = self.st.stuName;
self.stuNumberText.text = self.st.stuNumber;
self.stuTheoryText.text = self.st.stuTheory;
self.stuComputerText.text = self.st.stuComputer;
self.stuRemarksText.text = self.st.stuRemarks;
[_addButton setTitle:@"修改数据" forState:UIControlStateNormal];
}
}
- (IBAction)AddData:(id)sender {
if (self.idl == 0) {
Student *stu = [[Student alloc] init];
stu.stuName = self.stuNameText.text;
stu.stuNumber = self.stuNumberText.text;
stu.stuTheory = self.stuTheoryText.text;
stu.stuComputer = self.stuComputerText.text;
stu.stuRemarks = self.stuRemarksText.text;
[[LoadData shareLoadData] addData:stu];
[self.navigationController popViewControllerAnimated:YES];
}
else{
Student *stu = [[Student alloc] init];
stu.stuID = self.st.stuID;
stu.stuName = self.stuNameText.text;
stu.stuNumber = self.stuNumberText.text;
stu.stuTheory = self.stuTheoryText.text;
stu.stuComputer = self.stuComputerText.text;
stu.stuRemarks = self.stuRemarksText.text;
[[LoadData shareLoadData] updateData:stu];
[self.navigationController popViewControllerAnimated:YES];
}
}
xib如上
紧接着就完成了。
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