FMDB 的简单应用

iOS FMDB和简单的SQL语句运用

144  作者 iOS_愛OS 关注

2015.12.16 09:56 字数 753 阅读 3473评论 1喜欢 17

1.添加fmdb

点击这里下载fmdb

在项目中TARGETS->Build Phases ->Link Binary With Libraries 添加libsqlite3.tdb

导入fmdb库文件 添加依赖库 libsqlite3.tbd

把fmdb拖到自己的项目中 添加头文件 #import "DBManager.h"

TARGETS->Build Phases ->Compile Sources 中找到FMDatabaseQueue.m 和FMDatabasePool.m,改为非arc (-fno-objc-arc)

这下运行fmdb就不会报错了

2.SQL语句

我项目中使用的代码

//创建表格

-(void)initData

{

//1.获得数据库文件的路径

NSString *doc=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSString *fileName=[doc stringByAppendingString:@"/Test.db"];

//2.获得数据库

//        db=[FMDatabase databaseWithPath:fileName];

db = [[FMDatabase alloc]initWithPath:fileName];

//3.打开数据库

if ([db open]) {

//4.创表

NSString *str =[NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS student (stuID integer primary key autoincrement, stuName text,stuNumber text,stuAge text,stuScore text)"];

if ([db executeUpdate:str]) {

NSLog(@"创表成功");

[db close];

}else

{

NSLog(@"创表失败");

}

}

}

//添加数据

-(void)insertData:(Model*)stuInt

{

if ([db open]) {

NSString *str = [NSString stringWithFormat:@"insert into student  (stuName,stuNumber,stuAge,stuScore)values('%@','%@','%@','%@')",stuInt.stuName,stuInt.stuNumber,stuInt.stuAge,stuInt.stuScore];

if ([db executeUpdate:str]) {

NSLog(@"添加成功");

[db close];

}else{

NSLog(@"添加失败");

}

}

}

//删除数据

-(void)deleteData:(Model*)stuDele

{

if ([db open]) {

NSString *str = [NSString stringWithFormat:@"delete from student where stuID=%d",stuDele.stuID];

if ([db executeUpdate:str]) {

NSLog(@"删除成功");

[db close];

}else{

NSLog(@"删除失败");

}

}

}

//修改数据

-(void)upData:(Model*)stuUp

{

if ([db open]) {

NSString *str1 = [NSString stringWithFormat:@"update student set stuName = '%@' ,stuNumber = '%@' ,stuAge = '%@' ,stuScore = '%@'  where stuID = '%d'",stuUp.stuName,stuUp.stuNumber,stuUp.stuAge,stuUp.stuScore,stuUp.stuID];

if ([db executeUpdate:str1]) {

NSLog(@"修改数据成功");

[db close];

}else{

NSLog(@"修改失败");

}

}

}

//查询数据

-(NSMutableArray*)quertData

{

NSMutableArray *arr = [NSMutableArray array];

if ([db open]) {

NSString *quert = [NSString stringWithFormat:@"select *from student"];

FMResultSet *set = [db executeQuery:quert];

while ([set next]) {

Model *mo = [[Model alloc]init];

mo.stuID  = [set intForColumn:@"stuID"];

mo.stuName = [set stringForColumn:@"stuName"];

mo.stuNumber = [set stringForColumn:@"stuNumber"];

mo.stuAge = [set stringForColumn:@"stuAge"];

mo.stuScore = [set stringForColumn:@"stuScore"];

[arr addObject:mo];

}

NSLog(@"查询成功");

[db close];

}else{

NSLog(@"查询失败");

}

return arr;

}

浅宇

2楼 · 2017.03.22 17:15

- (nullable UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath;这个方法必须自己实现吗?我看了一些自定义layout的 没有写这个方法也正常运行 疑问????

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Felix灬泡泡

3楼 · 2017.04.06 16:45

你好,我用你的代码实现了想要的效果,但是我有几个疑问:

一、WaterFlowLayout文件实现了rowMarginInWaterflowLayout:等方法,但是没有看到设置minimumLineSpacing等属性值,请问,这是怎么达到效果的?

二、WaterFlowLayoutDelegate的几个代理方法中,设置WaterFlowLayout参数的意义是什么?

三、设置Header或Footer应该怎么设置?为什么我把该添加的都添加了,它还是不走collectionView: viewForSupplementaryElementOfKind: atIndexPath:方法?

四、-(instancetype)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

[self addSubview:self.table];

}

return self;

}

-(UITableView*)table

{

if (!_table) {

_table = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height) style:UITableViewStyleGrouped];

}

return _table;

}

新手初到,还望指点:blush:

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