iOS 中SQLite数据库操作

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)

 + (SQLite_Manager *)sharedManager{
     static SQLite_Manager *manager = nil;
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
         manager = [[SQLite_Manager alloc]init];
     });
     return manager;
 }

3.打开数据库,代码如下:

 - (void)open{
     //document路径
     NSString *docment = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
     //sqlite 路径
     NSString *sqlitePath = [docment stringByAppendingPathComponent:@"database.sqlite"];
     //打开数据库
     int result = sqlite3_open(sqlitePath.UTF8String, &db);
     //判断数据库是否打开成功
     if (result == SQLITE_OK) {
         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];
         [alertView show];
     }else {
         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];
         [alertView show];
     }
 }

4.创建表,代码如下:

 - (void)creatTable{
     //sql语句
     NSString *sqlString = @"create table Person (id integer primary key,name text,age integer)";
     //执行SQL语句
     char *error = nil;
     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);

     //判断是否出现了错误
     if (error == nil){
         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];
         [alertView show];
     }else {
         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];
         [alertView show];
     }
 }

5.插入数据,代码如下:

 - (void)insert{
     //sql语句
     NSString *sqlString = @"insert into Person ('name','age') values ('Ager',18)";
     //执行SQL语句
     char *error = nil;
     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);
     //判断是否出现了错误
     if (error == nil){
         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];
         [alertView show];
     }else {
         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];
         [alertView show];
     }

 }

6.修改数据,代码如下:

 - (void)update{
     //sql语句
     NSString *sqlString = @"update Person set 'name' = 'Arun' where id = 1";
     //执行sql语句
     char *error = nil;
     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);

     //判断是否出现了错误
     if (error == nil){
         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];
         [alertView show];
     }else {
         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];
         [alertView show];
     }
 }

7.查询数据,代码如下:

 - (void)select{
     //sql语句
     NSString *sqlString = @"select * from Person";
     //准备sql
     sqlite3_stmt *stmt = nil;
     sqlite3_prepare(db, sqlString.UTF8String,-, &stmt, nil);
     //单步执行语句
     while (sqlite3_step(stmt) == SQLITE_ROW) {
         int ID = sqlite3_column_int(stmt, );
         const unsigned char *name = sqlite3_column_text(stmt, );
         int age = sqlite3_column_int(stmt, );
         NSLog(@"%d,%s,%d",ID,name,age);
     }
     sqlite3_finalize(stmt);
 }

8.删除数据,代码如下:

 - (void)deleteData{
     //sql语句
     NSString *sqlString = @"delete from Person where id = 1";
     //执行sql语句
     char *error = nil;
     sqlite3_exec(db, sqlString.UTF8String, nil, nil, &error);
     //判断是否出现了错误
     if (error == nil){
         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];
         [alertView show];
     }else {
         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];
         [alertView show];
     }
 }

9.关闭数据库,代码如下:

 - (void)close{
     //关闭数据库
     int result = sqlite3_close(db);
     //判断数据库是否关闭成功
     if (result == SQLITE_OK) {
         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];
         [alertView show];
     }else {
         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];
         [alertView show];
     }
 }