iOS中SQLite數據庫操作

2019-11-14 18:05:04

字體：大中小

來源：轉載

供稿：網友

在iOS中實現SQLite數據庫的操作:1.導入框架(libsqlite3.0.tbd) 2.導入頭文件<sqlite3.h> 3.實現數據的增刪改查

實現簡單 SQLite數據庫操作的 demo 具體過程:

1.創建名為 SQLite_Manage 的.h .m 文件,導入頭文件 <sqlite3.h>

2.數據庫在一個app中只有一個,使用單例模式:(代碼如下)

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.打開數據庫,代碼如下:

 1 - (void)open{ 2     //document路徑 3     NSString *docment = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]; 4     //sqlite 路徑 5     NSString *sqlitePath = [docment stringByAppendingPathComponent:@"database.sqlite"]; 6     //打開數據庫 7     int result = sqlite3_open(sqlitePath.UTF8String, &db); 8     //判斷數據庫是否打開成功 9     if (result == SQLITE_OK) {10         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"打開成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];11         [alertView show];12     }else {13         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"打開失敗" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];14         [alertView show];15     }16 }

4.創建表,代碼如下:

 1 - (void)creatTable{ 2     //sql語句 3     NSString *sqlString = @"create table Person (id integer PRimary key,name text,age integer)"; 4     //執行SQL語句 5     char *error = nil; 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error); 7      8     //判斷是否出現了錯誤 9     if (error == nil){10         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"創建表成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];11         [alertView show];12     }else {13         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"創建表失敗" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];14         [alertView show];15     }16 }

5.插入數據,代碼如下:

 1 - (void)insert{ 2     //sql語句 3     NSString *sqlString = @"insert into Person ('name','age') values ('Ager',18)"; 4     //執行SQL語句 5     char *error = nil; 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error); 7     //判斷是否出現了錯誤 8     if (error == nil){ 9         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"插入數據成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];10         [alertView show];11     }else {12         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"插入數據失敗" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];13         [alertView show];14     }15 16 }

6.修改數據,代碼如下:

 1 - (void)update{ 2     //sql語句 3     NSString *sqlString = @"update Person set 'name' = 'Arun' where id = 1"; 4     //執行sql語句 5     char *error = nil; 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error); 7      8     //判斷是否出現了錯誤 9     if (error == nil){10         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"數據更新成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];11         [alertView show];12     }else {13         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"數據更新失敗" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];14         [alertView show];15     }16 }

7.查詢數據,代碼如下:

 1 - (void)select{ 2     //sql語句 3     NSString *sqlString = @"select * from Person"; 4     //準備sql 5     sqlite3_stmt *stmt = nil; 6     sqlite3_prepare(db, sqlString.UTF8String,-1, &stmt, nil); 7     //單步執行語句 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.刪除數據,代碼如下:

 1 - (void)deleteData{ 2     //sql語句 3     NSString *sqlString = @"delete from Person where id = 1"; 4     //執行sql語句 5     char *error = nil; 6     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error); 7     //判斷是否出現了錯誤 8     if (error == nil){ 9         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"刪除成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];10         [alertView show];11     }else {12         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"刪除失敗" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];13         [alertView show];14     }15 }

9.關閉數據庫,代碼如下:

 1 - (void)close{ 2     //關閉數據庫 3     int result = sqlite3_close(db); 4     //判斷數據庫是否關閉成功 5     if (result == SQLITE_OK) { 6         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"關閉成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil]; 7         [alertView show]; 8     }else { 9         UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"數據庫執行結果" message:@"關閉失敗" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];10         [alertView show];11     }12 }