在iOS中实现SQLite数据库的操作:1.导入框架(libsqlite3.0.tbd) 2.导入头文件<sqlite3.h> 3.实现数据的增删改查

实现简单 SQLite数据库操作 的 demo 具体过程:

1.创建名为 SQLite_Manage 的.h .m 文件,导入头文件 <sqlite3.h>

2.数据库在一个app中只有一个,使用单例模式:(代码如下)

1 + (SQLite_Manager *)sharedManager{
2     static SQLite_Manager *manager = nil;
3     static dispatch_once_t onceToken;
4     dispatch_once(&onceToken, ^{
5         manager = [[SQLite_Manager alloc]init];
6     });
7     return manager;
8 }

3.打开数据库,代码如下:

 1 - (void)open{
 2     //document路径
 3     NSString *docment = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
 4     //sqlite 路径
 5     NSString *sqlitePath = [docment stringByAppendingPathComponent:@"database.sqlite"];
 6     //打开数据库
 7     int result = sqlite3_open(sqlitePath.UTF8String, &db);
 8     //判断数据库是否打开成功
 9     if (result == SQLITE_OK) {
10         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"打开成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
11         [alertView show];
12     }else {
13         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"打开失败" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
14         [alertView show];
15     }
16 }

4.创建表,代码如下:

 1 - (void)creatTable{
 2     //sql语句
 3     NSString *sqlString = @"create table Person (id integer PRimary key,name text,age integer)";
 4     //执行SQL语句
 5     char *error = nil;
 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);
 7     
 8     //判断是否出现了错误
 9     if (error == nil){
10         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"创建表成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
11         [alertView show];
12     }else {
13         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"创建表失败" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
14         [alertView show];
15     }
16 }

5.插入数据,代码如下:

 1 - (void)insert{
 2     //sql语句
 3     NSString *sqlString = @"insert into Person ('name','age') values ('Ager',18)";
 4     //执行SQL语句
 5     char *error = nil;
 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);
 7     //判断是否出现了错误
 8     if (error == nil){
 9         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"插入数据成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
10         [alertView show];
11     }else {
12         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"插入数据失败" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
13         [alertView show];
14     }
15 
16 }

6.修改数据,代码如下:

 1 - (void)update{
 2     //sql语句
 3     NSString *sqlString = @"update Person set 'name' = 'Arun' where id = 1";
 4     //执行sql语句
 5     char *error = nil;
 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);
 7     
 8     //判断是否出现了错误
 9     if (error == nil){
10         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"数据更新成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
11         [alertView show];
12     }else {
13         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"数据更新失败" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
14         [alertView show];
15     }
16 }

7.查询数据,代码如下:

 1 - (void)select{
 2     //sql语句
 3     NSString *sqlString = @"select * from Person";
 4     //准备sql
 5     sqlite3_stmt *stmt = nil;
 6     sqlite3_prepare(db, sqlString.UTF8String,-1, &stmt, nil);
 7     //单步执行语句
 8     while (sqlite3_step(stmt) == SQLITE_ROW) {
 9         int ID = sqlite3_column_int(stmt, 0);
10         const unsigned char *name = sqlite3_column_text(stmt, 1);
11         int age = sqlite3_column_int(stmt, 2);
12         NSLog(@"%d,%s,%d",ID,name,age);
13     }
14     sqlite3_finalize(stmt);
15 }

8.删除数据,代码如下:

 1 - (void)deleteData{
 2     //sql语句
 3     NSString *sqlString = @"delete from Person where id = 1";
 4     //执行sql语句
 5     char *error = nil;
 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);
 7     //判断是否出现了错误
 8     if (error == nil){
 9         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"删除成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
10         [alertView show];
11     }else {
12         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"删除失败" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
13         [alertView show];
14     }
15 }

9.关闭数据库,代码如下:

 1 - (void)close{
 2     //关闭数据库
 3     int result = sqlite3_close(db);
 4     //判断数据库是否关闭成功
 5     if (result == SQLITE_OK) {
 6         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"关闭成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
 7         [alertView show];
 8     }else {
 9         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"数据库执行结果" message:@"关闭失败" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
10         [alertView show];
11     }
12 }