IOS SQLITE 数据库操作

NSArray * array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString * docPath = [array objectAtIndex:0];

NSString * dbPath = [docPath stringByAppendingPathComponent:@"test_db"];

NSLog(@"dbPath:%@",dbPath);

sqlite3 * database;

if( sqlite3_open([dbPath UTF8String], &database ) == SQLITE_OK)

{

NSLog(@"open success");

}

else

{

NSLog(@"open falied");

}

char * errorMsg;

NSString * sql = @"create table if not exists mytable( myid int not null primary key , age int , name varchar(255))";

if( sqlite3_exec(database, [sql UTF8String], NULL, NULL, &errorMsg) == SQLITE_OK )

{

NSLog(@"create table success");

}

else

{

NSLog(@"create talbe falied:%s",errorMsg);

sqlite3_free(errorMsg);

}

sql = @"insert into mytable(myid , age , name )values(100,18,'rollrock')";

if( sqlite3_exec(database, [sql UTF8String], NULL, NULL, &errorMsg) == SQLITE_OK )

{

NSLog(@"insert success");

}

else

{

NSLog(@"insert falied:%s",errorMsg);

sqlite3_free(errorMsg);

}

sqlite3_stmt * stmt;

sql = @"update mytable set name='rollrock&aaa' where myId = 100";

if( sqlite3_prepare_v2(database, [sql UTF8String], -1,&stmt , NULL ) == SQLITE_OK )

{

　　//一定要执行这句话才能生效

if( sqlite3_step(stmt) == SQLITE_DONE)

{

NSLog(@"update success");

}

}

else

{

NSLog(@"update false");

}

sql = @"select * from mytable";

if( sqlite3_prepare_v2(database, [sql UTF8String], -1, &stmt, nil) == SQLITE_OK )

{

NSLog(@"select success");

　　//

while( sqlite3_step(stmt) == SQLITE_ROW)

{

int myId = sqlite3_column_int(stmt, 0);

char * name = sqlite3_column_text(stmt, 2);

int age = sqlite3_column_int(stmt, 1);

NSLog(@"myId:%d name:%s age:%d",myId,name,age);

}

}

else

{

NSLog(@"select falied:%s",errorMsg);

sqlite3_free(errorMsg);

}