UI - DataBase
<ViewController.h>
#import <UIKit/UIKit.h> @interface ViewController : UIViewController @end
<ViewController.m>
#import "ViewController.h"
#import "DataBaseManager.h"
#import "Student.h"
@interface ViewController ()
@property (retain, nonatomic) IBOutlet UITextField *numberTf;
@property (retain, nonatomic) IBOutlet UITextField *nameTf;
@property (retain, nonatomic) IBOutlet UITextField *sexTf;
@property (retain, nonatomic) IBOutlet UITextField *ageTf;
@end
@implementation ViewController
//插入
- (IBAction)insertData:(id)sender {
//获取学生对象
Student *stu = [[Student alloc]init];
stu.name = self.nameTf.text;
stu.number = [self.numberTf.text intValue];
stu.age = self.ageTf.text;
stu.sex = self.sexTf.text;
//数据库插入操作
//1.打开数据库
sqlite3 *db = [DataBaseManager openDataBase];
//2.创建指令集(伴随指针)
sqlite3_stmt *stmt = nil;
//3.设置 sql 语句
NSString *sqlStr = @"INSERT INTO Student(number,name,sex,age)VALUES(?,?,?,?)";
//4.语法检查(注意,此时仅仅进行语法的检查 没有执行任何数据库的操作)
//此语句中的参数说明
//sqlite3 *db , 数据库的地址
//const char *zSql , SQL 语句(C语言字符串)
//int nByte , SQL 语句长度,一般给-1 代表不限制长度
//sqlite3_stmt **ppStmt , 给指令集指针的地址,内部会为我们创建的指令集自动赋值
//const char **pzTail , 预留参数
int flag = sqlite3_prepare_v2( db, [sqlStr UTF8String], -1, &stmt, NULL);
//5.判定语法检查是否正确
if (flag == SQLITE_OK) {
//6.参数绑定
sqlite3_bind_int( stmt, 1, (int)stu.number);
sqlite3_bind_text(stmt, 2, [stu.name UTF8String], -1, nil);
sqlite3_bind_text(stmt, 3, [stu.sex UTF8String], -1, nil);
sqlite3_bind_text(stmt, 4, [stu.age UTF8String], -1, nil);
//7.执行语句
sqlite3_step(stmt);
}
[stu release];
//8.释放内存
sqlite3_finalize(stmt);
//9.关闭数据库
[DataBaseManager closeDataBase];
}
//更新
- (IBAction)updataData:(id)sender {
//1.打开数据库
sqlite3 *db = [DataBaseManager openDataBase];
//2.创建指令集
sqlite3_stmt *stmt = nil;
//3.设置 sql语句
NSString *sqlStr = @"UPDATE Student SET sex = '女汉子' WHERE name = ?";
//4.语法检查
int flag = sqlite3_prepare_v2(db,[sqlStr UTF8String], -1, &stmt, NULL);
//5.判断语法是否正确
if (flag == SQLITE_OK) {
//6.绑定
sqlite3_bind_text(stmt, 1, [self.nameTf.text UTF8String], -1, nil);
//7.执行
sqlite3_step(stmt);
}
//8.释放内存
sqlite3_finalize(stmt);
//9.关闭数据库
[DataBaseManager closeDataBase];
}
//查询
- (IBAction)selectData:(id)sender {
//1.打开数据库
sqlite3 *db = [DataBaseManager openDataBase];
//2.创建指令集
sqlite3_stmt *stmt = nil;
//3.设置 sql 语句
NSString *sqlStr = @"SELECT *FROM Student WHERE number = ?";
//4.语法检查
int result = sqlite3_prepare_v2(db, [sqlStr UTF8String], -1, &stmt, NULL);
//5.判定语法是否正确
if (result == SQLITE_OK) {
//6.参数绑定
sqlite3_bind_int(stmt, 1, (int)[self.numberTf.text intValue]);
//7.执行语句
//对于数据的查询获取的结果可能有多个,所以要进行数据逐条查询,每一次 while 循环读取一条数据
//每一次读取一条数据会判断是否有下一条(SQLITE_ROW)当没有数据时, SQLITE_DONE 表示数据读取结束
while (sqlite3_step(stmt) == SQLITE_ROW) {
//数据获取
int number = sqlite3_column_bytes(stmt, 1);
char *name = (char *)sqlite3_column_text(stmt, 2);
char *sex = (char *)sqlite3_column_text(stmt, 3);
char *age = (char *)sqlite3_column_text(stmt, 4);
//对象封装
Student *stu = [[Student alloc] init];
stu.number = number;
stu.name = [NSString stringWithUTF8String:name];
stu.sex = [NSString stringWithUTF8String:sex];
stu.age = [NSString stringWithUTF8String:age];
NSLog(@"%ld , %@ , %@ , %@",stu.number,stu.name,stu.sex,stu.age);
[stu release];
}
}
//8.释放内存
sqlite3_finalize(stmt);
//9.关闭数据库
[DataBaseManager closeDataBase];
}
//删除
- (IBAction)deleteData:(id)sender {
//1.打开数据库
sqlite3 *db = [DataBaseManager openDataBase];
//2.穿件指令集
sqlite3_stmt *stmt = nil;
//3.设置 sql 语句
NSString *sqlStr =@"DELETE FROM Student WHERE number = ?";
//4.语法检查
int flag = sqlite3_prepare_v2(db, [sqlStr UTF8String], -1, &stmt, NULL);
//5.判断语法是否正确
if (flag == SQLITE_OK) {
//6.参数绑定
sqlite3_bind_int(stmt, 1, (int)[self.numberTf.text intValue]);
//7.执行语句
sqlite3_step(stmt);
}
//8.释放内存
sqlite3_finalize(stmt);
//9.关闭数据库
[DataBaseManager closeDataBase];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)dealloc {
[_numberTf release];
[_nameTf release];
[_sexTf release];
[_ageTf release];
[super dealloc];
}
@end
<DataBaseManager.h>
#import <Foundation/Foundation.h> #import <sqlite3.h> /*对于数据库需要简单地配置 : 1.导入动态链接库 sqlite3.0.dylib //每一个导入的文件.0 和没有.0 的区别在于.0的是最新的 2.导入库文件 sqlite3.h */ @interface DataBaseManager : NSObject //对于数据库管理类 DataBaseManager 只需要具备两个功能 //1.打开数据库 +(sqlite3 *)openDataBase; //2.关闭数据库 +(void)closeDataBase; @end
<DataBaseManager.m>
#import "DataBaseManager.h"
@implementation DataBaseManager
//因为对于一个程序一个数据库足以 所以只需要一个对象
static sqlite3 *db = nil;
+(sqlite3 *)openDataBase
{
// @synchronized
if (db) {
return db;
}
//获取 Caches 文件路径
NSString *cacherPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
//拼接数据库文件路径
NSString *dbPath = [cacherPath stringByAppendingString:@"/DB.sqlite"];
NSLog(@"%@",cacherPath);
//打开数据库
//根据给定文件路径打开数据库 如果数据库文件不存在就先创建一个
int result = sqlite3_open([dbPath UTF8String], &db);//[string UTF8String] 把 OC字符串转化成 C语言字符串
if (result == SQLITE_OK) {
NSLog(@"成功打开数据库");
//sql 语句
NSString *sqlStr = @"CREATE TABLE Student (stu_ID INTEGER PRIMARY KEY NOT NULL,number INTEGER NOT NULL,name TEXT NOT NULL,sex TEXT NOT NULL DEFAULT 未知,age TEXT NOT NULL DEFAULT 0)";
//执行 sql 语句
sqlite3_exec(db, [sqlStr UTF8String], NULL, NULL, NULL);
}
return db;
}
+(void)closeDataBase
{
int result = sqlite3_close(db);
if (result == SQLITE_OK) {
NSLog(@"关闭数据库");
db = nil;
}
}
@end
<Student.h>
#import <Foundation/Foundation.h> @interface Student : NSObject @property (nonatomic,copy)NSString *name; @property (nonatomic)NSInteger number; @property (nonatomic,copy)NSString *sex; @property (nonatomic,copy)NSString *age; @end
<Student.m>
#import "Student.h" @implementation Student @end