FMDB的简单实用，实现了基本的增删查改功能，需要复杂的功能话可以在此基础上进行延伸：
首先建立数据库管理类
DBManager.h文件
#import
@class TeacherModel;
@class ClassModel;
@interface DBManager : NSObject
/********
*
单例 数据库管理
*
********/
+ (DBManager *) sharedDBManager;
/***
*
添加老师
*
***/
- (void) addTeachder:(TeacherModel *) teacher;
/***
*
删除老师
*
***/
- (void) deleteTeachder:(TeacherModel *) teacher;
/***
*
查找老师
*
***/
- (TeacherModel *) searchTeacher:(TeacherModel *) teacher;
/***
*
更改老师信息
*
***/
- (void) updateTeachder:(TeacherModel *) teachder;
/***
*
打印所有老师信息
*
***/
- (NSMutableArray *) getAllTeacher;
DBManager.m文件
#import "DBManager.h"
#import "FMDB.h"
#import "TeacherModel.h"
#import "ClassModel.h"
static DBManager *dbManager = nil;
@interface DBManager(){
FMDatabase *_db;
}
@end
@implementation DBManager
+ (DBManager *)sharedDBManager {
// static dispatch_once_t onceToken;
// dispatch_once(&onceToken, ^{
// dbManager = [[DBManager alloc] init];
// [dbManager initDataBase];
// });
//
if (dbManager == nil) {
dbManager = [[DBManager alloc] init];
[dbManager initDataBase];
}
return dbManager;
}
+(instancetype)allocWithZone:(struct _NSZone *)zone{
if (dbManager == nil) {
dbManager = [super allocWithZone:zone];
}
return dbManager;
}
-(id)copy{
return self;
}
-(id)mutableCopy{
return self;
}
-(id)copyWithZone:(NSZone *)zone{
return self;
}
-(id)mutableCopyWithZone:(NSZone *)zone{
return self;
}
//初始化数据库
- (void) initDataBase {
//document路径
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
//文件路径
NSString *filePath = [documentPath stringByAppendingPathComponent:@"teacher.sqlite"];
//初始化FMDB对象
_db = [FMDatabase databaseWithPath:filePath];
//对数据库进行操作 打开
[_db open];
//初始化数据表
NSString *teacherSql = @"CREATE TABLE 'teacher' ('id' INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,'teacher_id' VARCHAR(255),'teacher_name' VARCHAR(255),'teacher_age' VARCHAR(255),'teacher_sex' VARCHAR(255))";
//创建数据表
[_db executeUpdate:teacherSql];
//关闭数据库
[_db close];
}
//添加老师
- (void)addTeachder:(TeacherModel *)teacher {
[_db open];
NSInteger mark = 0;
FMResultSet *result = [_db executeQuery:@"SELECT * FROM teacher"];
while ([result next]) {
if (mark < [[result stringForColumn:@"teacher_id"] integerValue]) {
mark = [[result stringForColumn:@"teacher_id"] integerValue];
}
}
mark++;
[_db executeUpdate:@"INSERT INTO teacher(teacher_id,teacher_name,teacher_age,teacher_sex)VALUES(?,?,?,?)",@(mark),teacher.name,@(teacher.age),teacher.sex];
[_db close];
}
//删除老师
- (void)deleteTeachder:(TeacherModel *)teacher {
[_db open];
[_db executeUpdate:@"DELETE FROM teacher where teacher_id = ?",teacher.ID];
[_db close];
}
- (TeacherModel *) searchTeacher:(TeacherModel *) teacher {
[_db open];
FMResultSet *result = [_db executeQuery:@"SELECT * FROM teacher"];
TeacherModel *tempTeacher;
while ([result next]) {
tempTeacher = [[TeacherModel alloc] init];
if ([teacher.name isEqualToString:@"HD"]) {
tempTeacher = teacher;
}
}
[_db close];
return tempTeacher;
}
- (void)updateTeachder:(TeacherModel *)teachder {
[_db open];
[_db executeUpdate:@"UPDATE 'teacher' SET teacher_name = ? where teacher_id = ?",teachder.name,teachder.ID];
[_db executeUpdate:@"UPDATE 'teacher' SET teacher_age = ? where teacher_id = ?",@(teachder.age),teachder.ID];
[_db executeUpdate:@"UPDATE 'teacher' SET teacher_sex = ? where teacher_id = ?",teachder.sex,teachder.ID];
[_db close];
}
- (NSMutableArray *)getAllTeacher{
[_db open];
NSMutableArray *dataArray = [NSMutableArray array];
FMResultSet *result = [_db executeQuery:@"SELECT * FROM teacher"];
while ([result next]) {
TeacherModel *teacher = [[TeacherModel alloc] init];
teacher.ID = @([[result stringForColumn:@"teacher_id"] integerValue]);
teacher.name = [result stringForColumn:@"teacher_name"];
teacher.age = [[result stringForColumn:@"teacher_age"] intValue];
teacher.sex = [result stringForColumn:@"teacher_sex"];
[dataArray addObject:teacher];
}
[_db close];
return dataArray;
}
使用
#import "FMDBViewController.h"
#import "DBManager.h"
#import "TeacherModel.h"
@interface FMDBViewController ()
@property (strong, nonatomic) UITableView *tableView;
@property (nonatomic, strong) NSMutableArray *dataArray;
@end
@implementation FMDBViewController
- (NSMutableArray *)dataArray {
if (!_dataArray) {
_dataArray = [NSMutableArray array];
}
return _dataArray;
}
- (UITableView *)tableView {
if (!_tableView) {
_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) style:UITableViewStylePlain];
_tableView.delegate = self;
_tableView.dataSource = self;
}
return _tableView;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addTeacher)];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"查询" style:UIBarButtonItemStylePlain target:self action:@selector(listTeacher)];
[self.view addSubview:self.tableView];
self.view.backgroundColor = [UIColor whiteColor];
self.dataArray = [[DBManager sharedDBManager] getAllTeacher];
[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.dataArray.count;
}
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
TeacherModel *teacher = self.dataArray[indexPath.row];
cell.textLabel.text = [NSString stringWithFormat:@"%@---%@---%d",teacher.name,teacher.sex,teacher.age];
return cell;
}
//设置删除按钮
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
TeacherModel *teacher = self.dataArray[indexPath.row];
[[DBManager sharedDBManager] deleteTeachder:teacher];
[self.dataArray removeObjectAtIndex:indexPath.row];
[self.tableView deleteRowsAtIndexPaths:[NSMutableArray arrayWithObject:indexPath] withRowAnimation:0];
[self.tableView reloadData];
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
TeacherModel *teacher = self.dataArray[indexPath.row];
teacher.age++;
[[DBManager sharedDBManager] updateTeachder:teacher];
self.dataArray = [[DBManager sharedDBManager] getAllTeacher];
[self.tableView reloadData];
}
- (void) addTeacher {
TeacherModel *teacher = [[TeacherModel alloc] init];
teacher.name = @"HD";
teacher.age = 18;
teacher.sex = @"girl";
[[DBManager sharedDBManager] addTeachder:teacher];
self.dataArray = [[DBManager sharedDBManager] getAllTeacher];
[self.tableView reloadData];
}
- (void) listTeacher {
self.dataArray = [[DBManager sharedDBManager] getAllTeacher];
for (TeacherModel *teacher in self.dataArray) {
if ([teacher.name isEqualToString:@"HD"]) {
NSLog(@"----teacher----- %@",teacher.name);
}
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end