iOS中 用FMDB封装一个SQLite数据库

建立一个单例：

DataBaseHandle.h

#import <Foundation/Foundation.h>
@class PersonModel;
@class FMDatabase;
@interface DataBaseHandle : NSObject
@property(nonatomic,retain)FMDatabase *db;
//创建单例的的接口
+ (DataBaseHandle *)shareDateBaseHandle;
//创建一个Person表格
- (void)creatPersonTable;
//插入person的方法
- (void)insertPersonTable : (PersonModel *)person;
//写一个删除人的接口
- (void)deletePersonByPerssonID : (NSString *)ID;
//写一个修改人的接口
- (void)uodatePerson : (NSString *)age ByPersonID : (NSString *)ID;
//写一个查询所有人的接口
- (NSMutableArray *)selectAllPersonFromPersonTable;
@end

DataBaseHandle.m

#import "DataBaseHandle.h"
#import "FMDB.h"
#import "PersonModel.h"
@implementation DataBaseHandle
- (void)dealloc
{
self.db = nil;
[super dealloc];
}

创建单例的的接口：

//创建单例对象使其存在于静态区
static DataBaseHandle *handle = nil;
//创建单例的的借口
+ (DataBaseHandle *)shareDateBaseHandle{

@synchronized(self){
if (handle == nil) {
handle = [[DataBaseHandle alloc]init];

}
}
return handle;
}

写一个私有的方法，返回数据库的路径

- (NSString *)dbpath{
return [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"db.sqlite"];

}

创建一个Person表格

//创建一个Person表格
- (void)creatPersonTable{
//初始化数据库对象
self.db = [FMDatabase databaseWithPath: [self dbpath]];
//打开数据库
BOOL isOpen = [self.db open];
if (isOpen) {
NSLog(@"打开成功");
//创建表
BOOL isCreat =   [self.db executeUpdate:@"create table if not exists Person(id integer primary key autoincrement,name text,gender text,age integer,salary integer)"];
NSLog(@"%@",isCreat ? @"创建成功":@"创建失败");

}else{
NSLog(@"打开失败");
}
}

四种方法：增、删、改、查；

//插入person的方法
- (void)insertPersonTable : (PersonModel *)person{
BOOL isInsert =  [self.db executeUpdate:@"insert into Person(name,age)values(?,?)",person.name,person.age];
NSLog(@"%@",isInsert ? @"插入成功":@"插入失败");

}

//写一个删除的接口
- (void)deletePersonByPerssonID : (NSString *)ID{
BOOL isDelete = [self.db executeUpdate:@"delete from Person where id = ?",ID];
NSLog(@"%@",isDelete ? @"删除成功":@"删除失败");
}

//写一个修改人的接口
- (void)uodatePerson : (NSString *)age ByPersonID : (NSString *)ID{
BOOL isUpdate = [self.db executeUpdate:@"update Person set age = ? where id = ?",age,ID];
NSLog(@"%@",isUpdate ? @"修改成功":@"修改失败");
}

//写一个查询所有人的接口
- (NSMutableArray *)selectAllPersonFromPersonTable{
FMResultSet *set = [self.db executeQuery:@"select * from Person"];
NSMutableArray *array = [NSMutableArray arrayWithCapacity:0];
while ([set next]) {
NSInteger ID = [set intForColumn:@"id"];
NSString *name = [set stringForColumn:@"name"];
NSInteger age = [set intForColumn:@"age"];
//创建Person对象存储信息
PersonModel *p = [[PersonModel alloc]init];
p.ID = [NSString stringWithFormat:@"%ld",ID];
p.name = name;
p.age = [NSString stringWithFormat:@"%ld",age];
//添加到数组
[array addObject:p];
[p release];
}
return array;
}

建一个model类

PersonModel.h
#import <Foundation/Foundation.h>
@interface PersonModel : NSObject
@property(nonatomic,copy)NSString *ID;
@property(nonatomic,copy)NSString *name;
@property(nonatomic,copy)NSString *age;
@end

PersonModel.m
#import "PersonModel.h"

@implementation PersonModel
- (void)dealloc
{
self.name = nil;
self.age = nil;
self.ID = nil;
[super dealloc];
}
@end

===============================测试调用===============================

#import "FirstViewController.h"
#import "DataBaseHandle.h"
#import "PersonModel.h"
@interface FirstViewController ()
@property(nonatomic,retain)NSMutableArray *dataSource;//接收查询的结果
@end

@implementation FirstViewController
- (void)dealloc
{
self.dataSource = nil;
[super dealloc];
}

//懒加载
- (NSMutableArray *)dataSource{
if (_dataSource == nil) {
self.dataSource = [NSMutableArray arrayWithCapacity:0];
}

return [[_dataSource retain]autorelease];
}

TEXT:

- (void)viewDidLoad {
[super viewDidLoad];
//调用并验证
[[DataBaseHandle shareDateBaseHandle]creatPersonTable];
NSLog(@"%@",NSHomeDirectory());
PersonModel *p = [[PersonModel alloc]init];
p.name = @"小韩哥";
p.age = @"20";
//调用插入person的方法
//    [[DataBaseHandle shareDateBaseHandle]insertPersonTable:p];

//接收数据库返回的查询结果
self.dataSource = [[DataBaseHandle shareDateBaseHandle]selectAllPersonFromPersonTable];

//调用删除人的方法
[[DataBaseHandle shareDateBaseHandle]deletePersonByPerssonID:@"9"];

}

配置显示：

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

// Return the number of sections.
return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

// Return the number of rows in the section.
return self.dataSource.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"firstcell" forIndexPath:indexPath];
PersonModel *p = self.dataSource[indexPath.row];
cell.textLabel.text = p.name;

return cell;
}

布局预览：



提示：重在封装SQLite思想，不在效果，能有效调用即可！