UI数据库

#import "ViewController.h"

#import "LCDBManager.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

Student *s1 = [Student new];

s1.number = 1;

s1.name = @"宋立龙";

s1.gender = @"男";

s1.age = 23;

s1.score = 59.9;

Student *s2 = [Student new];

s2.number = 2;

s2.name = @"李金良";

s2.gender = @"男";

s2.age = 24;

s2.score = 60;

Student *s3 = [Student new];

s3.number = 3;

s3.name = @"去洪亮";

s3.gender = @"男";

s3.age = 25;

s3.score = 61;

LCDBManager *manager = [LCDBManager shareManager];

//打开数据库

[manager openDataBase];

//创建表

// [manager creatTable];

//

// //插入数据

// [manager insertDataFromStudent:s1];

// [manager insertDataFromStudent:s2];

// [manager insertDataFromStudent:s3];

//

//删除数据

[manager deleteDataWithNumber:3];

//修改书据

[manager updateDataForName:@"李聪" withAge:24];

//查找数据

NSArray *result = [manager selectedAllData];

NSLog(@"%@",result[1]);

//关闭数据库

[manager closeDataBase];

}

#import <Foundation/Foundation.h>

#import <CoreAudioKit/CoreAudioKit.h>

@interface Student : NSObject

@property(assign,nonatomic) NSUInteger number;

@property(strong,nonatomic) NSString *name;

@property(assign,nonatomic) NSUInteger age;

@property(strong,nonatomic) NSString *gender;

@property(assign,nonatomic) CGFloat score;

@end

#import "Student.h"

@implementation Student

-(NSString *)description {

return [NSString stringWithFormat:@"%@",_name];

}

@end

#import <Foundation/Foundation.h>

#import <sqlite3.h>

#import "Student.h"

@interface LCDBManager : NSObject<NSCopying,NSMutableCopying>

//创建单例得静态方法

+(instancetype)shareManager;

//打开数据库

-(void)openDataBase;

//关闭数据库

-(void)closeDataBase;

//创建表

-(void)creatTable;

//增

-(void)insertDataFromStudent:(Student *)student;

//删

-(void)deleteDataWithNumber:(NSUInteger )number;

//改

-(void)updateDataForName:(NSString *)name withAge:(NSUInteger)age;

//查

-(NSArray *)selectedAllData;

@end

#import "LCDBManager.h"

@implementation LCDBManager

static sqlite3 *db = nil;

static LCDBManager *manager = nil;

+(instancetype)shareManager {

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

manager = [self new];

});

return manager;

}

//完善单例

+(instancetype)allocWithZone:(struct _NSZone *)zone {

@synchronized(manager) {

if(!manager)

{

manager = [super allocWithZone:zone];

}

}

return manager;

}

-(instancetype)init {

@synchronized(self) {

self = [super init];

return self;

}

}

-(id)copyWithZone:(NSZone *)zone {

return self;

}

-(id)mutableCopyWithZone:(NSZone *)zone {

return self;

}

-(id)mutableCopy {

return self;

}

-(id)copy {

return self;

}

//数据库操作

-(void)openDataBase {

if(nil!=db) {

return;

}

//路径

NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];

path = [path stringByAppendingPathComponent:@"LCStudent.sqlite"];

//打开数据库

int result = sqlite3_open(path.UTF8String, &db);

if(result == SQLITE_OK) {

NSLog(@"打开成功 ");

}else {

NSLog(@"打开失败,失败代码是%d",result);

}

}

-(void)closeDataBase {

//关闭数据库

int result = sqlite3_close(db);

if(result == SQLITE_OK)

{

NSLog(@"关闭成功");

}else {

NSLog(@"关闭失败,错误代码e为%d",result);

}

}

//创建表

-(void)creatTable {

NSString *sqlWord = @"CREATE TABLE IF NOT EXISTS 's_student' ('number' INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE, 'name' TEXT NOT NULL, 'age' INTEGER DEFAULT 18,'gender' TEXT DEFAULT 男, 'score' REAL NOT NULL)";

//执行

int result = sqlite3_exec(db, sqlWord.UTF8String, NULL, NULL, NULL);

if(result == SQLITE_OK) {

NSLog(@"创建表成功");

}else {

NSLog(@"创建表失败,错误代码为%d",result);

}

}

//增

-(void)insertDataFromStudent:(Student *)student {

//准备

NSString *sqlWord = [NSString stringWithFormat:@"insert into 's_student' values (%lu,'%@',%lu,'%@',%lf)",student.number,student.name,student.age,student.gender,student.score];

//执行

int result = sqlite3_exec(db, sqlWord.UTF8String, NULL, NULL, NULL);

if(result == SQLITE_OK) {

NSLog(@"增加成功");

}else {

NSLog(@"增加失败,错误代码为%d",result);

}

}

//删

-(void)deleteDataWithNumber:(NSUInteger)number {

//准备sql语句

NSString *sqlWord = [NSString stringWithFormat:@"delete from s_student where number = %lu",number];

//执行

int result = sqlite3_exec(db, sqlWord.UTF8String, NULL, NULL, NULL);

if(result == SQLITE_OK) {

NSLog(@"删除成功");

}else {

NSLog(@"删除成功,错误代码%d",result);

}

}

//改

-(void)updateDataForName:(NSString *)name withAge:(NSUInteger)age {

NSString *sqlWord = [NSString stringWithFormat:@"update 's_student' set name = '%@' where age = %lu",name,age];

int result = sqlite3_exec(db, sqlWord.UTF8String, NULL, NULL, NULL);

//

if(result == SQLITE_OK ) {

NSLog(@"修改成功");

}else {

NSLog(@"修改失败%d",result);

}

}

//查//全部

-(NSArray *)selectedAllData {

//准备可变数组

NSMutableArray *dataArray = nil;

//创建伴随指针

sqlite3_stmt *stmt = nil;

//准备sql语句

NSString *sqlWord = @"select *from 's_student'";

//执行语句

int result = sqlite3_prepare(db, sqlWord.UTF8String, -1,&stmt, NULL);

if(result == SQLITE_OK) {

dataArray = [[NSMutableArray alloc] initWithCapacity:10];

while (sqlite3_step(stmt) == SQLITE_ROW) {

Student *student = [Student new];

student.number =sqlite3_column_int(stmt, 0);

student.name = [NSString stringWithUTF8String:(const char *)sqlite3_column_text(stmt, 1)];

student.age = sqlite3_column_int(stmt, 2);

student.gender = [NSString stringWithUTF8String:(const char *)sqlite3_column_text(stmt, 3)];

student.score = sqlite3_column_double(stmt, 4);

[dataArray addObject:student];

}

}else {

NSLog(@"查询失败");

}

//释放伴随指针

sqlite3_finalize(stmt);

return dataArray;

}

@end