//

//  DataBasehandle.m

//  Ui - 18 数据库

//

//  Created by dllo on 15/12/2.

//  Copyright (c) 2015年 dllo. All rights reserved.

//

#import "DataBasehandle.h"

#import "Student.h"

#import <sqlite3.h>

@implementation DataBasehandle

+(instancetype)sharedDatabase

{

static DataBasehandle *dataBase = nil;

if (nil == dataBase) {

dataBase = [[DataBasehandle alloc]init];

}

return dataBase;

}

static sqlite3  *DB = nil;

//sql指令(以Student举例):

//

//创建表单 : @"CREATE TABLE IF NOT EXISTS student(number integer PRIMARY KEY AUTOINCREMENT, name TEXT, sex TEXT, age integer)"

//

//删除表单 : @"DROP TABLE student"

//

//插入数据 : @"INSERT INTO student(name, sex, age) VALUES ('%@', '%@', '%ld')", stu.name, stu.sex, stu.age

//

//删除数据 : @"DELETE FROM student WHERE number = '%ld'", num

//

//修改数据(按num) : @"UPDATE student SET name = '%@', sex = '%@', age = '%ld' WHERE number = '%ld'", stu.name, stu.sex, stu.age, num

//

//查询所有数据 : SELECT * FROM student

//

//按分类查找(按sex) : @"SELECT * FROM student WHERE  sex LIKE '%%%@%%'", sex

- (void)openDB

{

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

NSString *filepath = [path stringByAppendingPathComponent:@"dataBase.db"];

//打开数据库

//注意将文件路径转为c语言识别的字符串类型

int ret = sqlite3_open(filepath.UTF8String, &DB);

if (SQLITE_OK == ret) {

NSLog(@"打开数据库成功");

} else {

NSLog(@"打开数据库失败");

}

}

- (void)closeDB

{

int ret = sqlite3_close(DB);

if (SQLITE_OK == ret) {

NSLog(@"关闭数据库成功");

} else {

NSLog(@"关闭数据库失败");

}

}

- (void)createTable

{

NSString *sqlStr = @"CREATE TABLE IF NOT EXISTS student(number integer PRIMARY KEY AUTOINCREMENT, name TEXT, sex TEXT, age integer)";

int ret = sqlite3_exec(DB, sqlStr.UTF8String, NULL, NULL, NULL);

if (SQLITE_OK == ret) {

NSLog(@"创建表单成功");

} else {

NSLog(@"创建表单失败");

}

}

- (void)deleteTable

{

NSString *sqlStr =  @"DROP TABLE student";

int ret = sqlite3_exec(DB, sqlStr.UTF8String, NULL, NULL, NULL);

if (SQLITE_OK == ret) {

NSLog(@"删除表单成功");

} else {

NSLog(@"删除表单失败");

}

}

- (void)insertDataWithStudent:(Student *)stu

{

NSString *sqlStr = [NSString stringWithFormat:@"INSERT INTO student(name, sex, age) VALUES ('%@', '%@', '%ld')", stu.name, stu.sex, stu.age];

int ret = sqlite3_exec(DB, sqlStr.UTF8String, NULL, NULL, NULL);

if (SQLITE_OK == ret) {

NSLog(@"插入数据成功");

} else {

NSLog(@"插入数据失败");

}

}

- (void)deleteDataWithNumber:(NSInteger)num

{

NSString *sqlstr = [NSString stringWithFormat: @"DELETE FROM student WHERE number = '%ld'", num];

int ret = sqlite3_exec(DB, sqlstr.UTF8String, NULL, NULL, NULL);

if (SQLITE_OK == ret) {

NSLog(@"删除数据成功");

} else {

NSLog(@"删除数据失败");

}

}

- (void)updataWithNumber:(NSInteger)num Student:(Student *)stu

{

NSString *sqlstr = [NSString stringWithFormat: @"UPDATE student SET name = '%@', sex = '%@', age = '%ld' WHERE number = '%ld'", stu.name, stu.sex, stu.age, num];

int ret = sqlite3_exec(DB, sqlstr.UTF8String, NULL, NULL, NULL);

if (SQLITE_OK == ret) {

NSLog(@"修改数据成功");

} else {

NSLog(@"修改数据失败");

}

}

- (NSMutableArray *)selectAllStudent

{

NSString *sqlstr = @"SELECT * FROM student";

sqlite3_stmt *stmt = nil;

int ret = sqlite3_prepare_v2(DB, sqlstr.UTF8String, -1, &stmt, NULL);

if (SQLITE_OK == ret) {

NSMutableArray *arr = [NSMutableArray array];

//判断是否还有有效数据

while (SQLITE_ROW == sqlite3_step(stmt)) {

//参数:列数

const unsigned char *name =  sqlite3_column_text(stmt, 1);

const unsigned char *sex =  sqlite3_column_text(stmt, 2);

sqlite3_int64 age = sqlite3_column_int(stmt, 3);

Student *stu = [[Student alloc]init];

//            stu.name = name;

stu.name = [NSString stringWithUTF8String:(const char *)name];

stu.sex = [NSString stringWithUTF8String:(const char *)sex];

//整型可以直接强转

stu.age = (NSInteger)age;

[arr addObject:stu];

[stu release];

}

return arr;

} else {

NSLog(@"获取数据失败");

return nil;

}

}

- (NSMutableArray *)selectBySexOfStudent:(NSString *)sex name:(NSString *)name

{

NSString *sqlstr = [NSString stringWithFormat:  @"SELECT * FROM student WHERE  sex LIKE '%%%@%%'    and name = '%@'", sex, name ];

sqlite3_stmt *stmt = nil;

int ret = sqlite3_prepare_v2(DB, sqlstr.UTF8String, -1, &stmt, NULL);

if (SQLITE_OK == ret) {

NSMutableArray *arr = [NSMutableArray array];

//判断是否还有有效数据

while (SQLITE_ROW == sqlite3_step(stmt)) {

//参数:列数

const unsigned char *name =  sqlite3_column_text(stmt, 1);

const unsigned char *sex =  sqlite3_column_text(stmt, 2);

sqlite3_int64 age = sqlite3_column_int(stmt, 3);

Student *stu = [[Student alloc]init];

//            stu.name = name;

stu.name = [NSString stringWithUTF8String:(const char *)name];

stu.sex = [NSString stringWithUTF8String:(const char *)sex];

//整型可以直接强转

stu.age = (NSInteger)age;

[arr addObject:stu];

[stu release];

}

return arr;

} else {

NSLog(@"获取数据失败");

return nil;

}

}

@end

//

//  Student.h

//  Ui - 18 数据库

//

//  Created by dllo on 15/12/2.

//  Copyright (c) 2015年 dllo. All rights reserved.

//

#import <Foundation/Foundation.h>

@interface Student : NSObject

@property (nonatomic, copy)NSString *name;

@property (nonatomic, copy)NSString *sex;

@property (nonatomic, assign)NSInteger age;

@end

//

//  Student.m

//  Ui - 18 数据库

//

//  Created by dllo on 15/12/2.

//  Copyright (c) 2015年 dllo. All rights reserved.

//

#import "Student.h"

@implementation Student

- (void)dealloc

{

[_name release];

[_sex release];

[super dealloc];

}

@end