Ios5 iphone应用程序中的sqlite3
我在sqlite3表中构建。执行以下选择命令时:Ios5 iphone应用程序中的sqlite3,ios5,sqlite,xcode4.2,Ios5,Sqlite,Xcode4.2,我在sqlite3表中构建。执行以下选择命令时: select us.saleSpecificProduct,us.fAtMall,u.name,u.gender,st.storeName from UsersSale us,Users u,Stores st where u.userID=us.userID and st.storeID=us.saleStoreID order by us.saleID 它在shell中工作正常,但是如果我把这个语句放在我的iphone应用程序中,我会
select us.saleSpecificProduct,us.fAtMall,u.name,u.gender,st.storeName
from UsersSale us,Users u,Stores st
where u.userID=us.userID and st.storeID=us.saleStoreID order by us.saleID
它在shell中工作正常,但是如果我把这个语句放在我的iphone应用程序中,我会得到一个错误
/*
* read items from the database and store in itemw
*
*/
-(void)readItems {
if (!database) return; // earlier problems
// build select statement
if (!selStmt)
{
const char *sql = "select us.saleSpecificProduct,us.fAtMall,u.name,u.gender,st.storeName from UsersSale us,Users u,Stores st where u.userID=us.userID and st.storeID=us.saleStoreID order by us.saleID";
if (sqlite3_prepare_v2(database, sql, -1, &selStmt, NULL) != SQLITE_OK)
{
selStmt = nil;
}
当我执行应用程序时,在“sqlite3\u prepare\u v2”中出现错误
}
怎么了 也许可以尝试将参数放在单引号内 比如:
WHERE u.userID = 'us.userID' AND st.storeID = 'us.saleStoreID' ORDER BY us.saleID
此外,还应使用绑定来获取安全语句:
e、 g
NSString *strGet = @" . . . WHERE u.userID = ? AND st.storeID = ? ORDER BY us.saleID"
if(sqlite_prepare_v2(...) == SQLITE_OK)
{
sqlite3_bind_int(stmtGet, 1, us.userID);
sqlite3_bind_int(stmtGet, 2, us.saleStoreID);
while(sqlite3_step(stmtGet) == SQLITE_ROW)
{
DatabaseDataObject *myDataObj = [[DatabaseDataObject alloc] init];
myDataObj.objID = sqlite3_column_int(0);
myDataObj.postcode = sqlite3_column_int(1);
// add to parameter array of objects
[myArr addObject:myDataObj];
[myDataObj release];
}
}