iphone中的sqlite数据库

问题描述

| 如何保留登录表中的所有行？我只能保留一行，为什么不能保留其他行？我使用错误的查询吗？请检查我的代码：

#import \"loginAppDelegate.h\"
#import \"global.h\"
#import <sqlite3.h>
#import \"logincontroller.h\"

@implementation loginAppDelegate

@synthesize window;
@synthesize loginView;
//databaseName=@\"login.sqlite\";

-(void) chekAndCreateDatabase
{
    BOOL success;
    //sqlite3   *databaseName=@\"login.sqlite\";
    NSFileManager *fileManager=[NSFileManager defaultManager];
    NSArray *documentPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    Nsstring *documentsDir =[documentPaths objectAtIndex:0];
    Nsstring    *databasePath=[documentsDir stringByAppendingPathComponent:@\"login.sqlite\"];
    success=[fileManager fileExistsAtPath:databasePath];
    if(success)return;

    Nsstring *databasePathFromApp=[[[NSBundle mainBundle]resourcePath]stringByAppendingPathComponent:@\"login.sqlite\"];

    [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
    [fileManager release];
}


-(void) Data
{

    Gpass=@\"\";
    Guname=@\"\";
sqlite3_stmt *detailStmt=nil;
//sqlite3   *databaseName;

    NSArray *documentPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,YES);
    Nsstring *documentsDir =[documentPaths objectAtIndex:0];
   Nsstring *databasePath=[documentsDir stringByAppendingPathComponent:@\"login.sqlite\"];
    [self chekAndCreateDatabase];

    sqlite3 *database;
    if (sqlite3_open([databasePath UTF8String],&database)==sqlITE_OK) {
        if (detailStmt==nil) {
            const char *sql= \"select *from Loginchk where uname=\'%?\'and password=\'%?\'\";
            //Nsstring *sql = [[Nsstring alloc] initWithFormat:@\"SELECT * FROM Loginchk WHERE uname =\'%@\' and password =\'%@\' \",Uname.text,Password.text];
            if (sqlite3_prepare_v2(database,sql,-1,&detailStmt,NULL)==sqlITE_OK) {

                sqlite3_bind_text(detailStmt,1,[Gunameq UTF8String],sqlITE_TRANSIENT);
                sqlite3_bind_text(detailStmt,2,[Gpassq UTF8String],sqlITE_TRANSIENT);

                if (sqlITE_DONE!= sqlite3_step(detailStmt)) {
                    Guname=[Nsstring stringWithUTF8String:(char*)sqlite3_column_text(detailStmt,0)];
                    Gpass =[Nsstring stringWithUTF8String:(char*)sqlite3_column_text(detailStmt,1)];
                    NSLog(@\"\'%@\'\",Guname);
                    NSLog(@\"\'%@\'\",Gpass);

                }
            }
            sqlite3_finalize(detailStmt);
        }
    }
    sqlite3_close(database);
    }

    

解决方法

//Declare Class as Following to store user details UserDetails.h

@interface UserDetails : NSObject 
{
    NSString *strUserName;
    NSString *strPassword;
}
@property (nonatomic,assign) NSString * strUserName;
@property (nonatomic,retain) NSString * strPassword;

//Declare Class as Following to store user details UserDetails.m
@implementation UserDetails 
@synthesize strUserName,strPassword;
-(void)dealloc
{
    [super dealloc];
    [strUserName release];
    [strPassword release];
}

//Declare Class as Following to store user details Your ApplicationDelegate.m file
-(NSMutableArray)getAllUserDetails
{
    sqlite3_stmt *selectStmt = nil; 
    NSArray *documentPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *documentsDir =[documentPaths objectAtIndex:0];
    NSString *databasePath=[documentsDir stringByAppendingPathComponent:@\"login.sqlite\"];
    [self chekAndCreateDatabase];

    NSMutableArray *arrUsers = [[NSMutableArray alloc] init];
    const char *sqlStatement = \"your query\";

if(sqlite3_prepare_v2(database,sqlStatement,-1,&selectStmt,NULL) == SQLITE_OK) 
{
    // Loop through the results and add them to the feeds array
    while(sqlite3_step(selectStmt) == SQLITE_ROW) 
    {
        UserDetails *objUserDetail = [[UserDetails alloc] init];
        objUserDetail.userName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectStmt,1)];
        objUserDetail.password = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectStmt,2)];
        [arrUsers addObject:objUserDetail];
        [objUserDetail release];
    }
}
// Release the compiled statement from memory
sqlite3_finalize(selectStmt);
selectStmt = nil;

} 在按钮单击事件中将此函数称为

-(IBAction)btnLogin
{
    BOOL isUserExists = NO;
    NSMutableArray *arrAllUsers = [loginAppDelegate getAllUserDetails];
    //Normal Checking Stuff
    for(UserDetails *objUser in arrAllUsers)
    {
        if([txtUserTextBox.text isEqualToString:objUser.strUserName] && [txtPasswordTextBox.text isEqualToString:objUser.strPassword])
        {
            //True Login
            isUserExists = YES;
            break;
        }
    }

    //Check your stuff if user exists or not what to do
    if(isUserExists)
    {
        Heading to next screen;
    }
    else
    {
        Alertmessage
    }
}