我正在尝试将数据插入到我的SQLite数据库中。我已经为我的项目导入了所有neccassry框架和数据库文件。在我的控制器类xib中有两个文本字段和一个按钮。我希望在单击按钮时将数据输入到我的数据库中保存的两个文本字段中。
在我的app delagate中，我创建了两个函数，一个函数用于追加数据库的路径，另一个函数用于将数据插入数据库。在插入函数中，我检查某些条件，即，如果添加了数据，则应显示警报视图，显示添加的记录，但是当我添加新记录时，它总是进入else块，这是错误。
-(void)checkAndCreateDB {
NSString* databaseName = @"login.sqlite";
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *databasePath=[documentsDir stringByAppendingPathComponent:@"login.sqlite"];
databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
success = [fileManager fileExistsAtPath:databasePath];
if(success) return;
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
}
-(void)insertData{
sqlite3 *database;
sqlite3_stmt *statement;
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *databasePath=[documentsDir stringByAppendingPathComponent:@"login.sqlite"];
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat: @"INSERT INTO Loginchk (uname,password) VALUES ('%@',' %@');",Gunameq,Gpassq];
const char *insert_stmt = [insertSQL UTF8String];
if(sqlite3_prepare_v2(database, insert_stmt, -1, &statement, nil)== SQLITE_OK)
{
sqlite3_bind_text(statement, 1, [Gunameq UTF8String], -1, NULL);
sqlite3_bind_text(statement, 2, [Gpassq UTF8String], -1, NULL);
}
if(sqlite3_step(statement)==SQLITE_DONE)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Add Record" message:@"Contact Added" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
alert=nil;
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"record" message:@"record not created" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
alert=nil;
}
// Release the compiled statement from memory
sqlite3_finalize(statement);
sqlite3_close(database);
}
}
这是我的登录控制器类。在这里，我已经声明了一个函数，通过它我可以访问我的app delegate的函数。
-(IBAction)buttonPressed:(id)sender
{
Gpassq=Password.text;
Gunameq=Uname.text;
NSLog(@"%@%@",Gunameq,Gpassq);
AddListAppDelegate *appDelegate =(AddListAppDelegate *)[[UIApplication sharedApplication]delegate];
[appDelegate insertData];
}
请解决此问题。
答案 0 :(得分：4)
static sqlite3_stmt *insertStmt = nil;
if(insertStmt == nil)
{
insertSql = "INSERT INTO Loginchk (uname,password) VALUES(?,?)";
if(sqlite3_prepare_v2(database, insertSql, -1, &insertStmt, NULL) != SQLITE_OK)
NSAssert1(0, @"Error while creating insert statement. '%s'", sqlite3_errmsg(database));
}
sqlite3_bind_text(insertStmt, 1, [Gunameq UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(insertStmt, 2, [Gpassq UTF8String], -1, SQLITE_TRANSIENT);
if(SQLITE_DONE != sqlite3_step(insertStmt))
NSAssert1(0, @"Error while inserting data. '%s'", sqlite3_errmsg(database));
else
NSLog("Inserted");
//Reset the add statement.
sqlite3_reset(insertStmt);
insertStmt = nil;
在上面你可以看到。如果你是绑定数据，则不需要stringWithFormat。只需加上问号而不是绑定文本。
希望它有所帮助。
答案 1 :(得分：3)
可以运行此代码
-(void) insert:key1:key2:key3
{
databaseName= @"db3.sqlite";
NSArray *documentPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDir=[documentPaths objectAtIndex:0];
databasePath=[documentsDir stringByAppendingPathComponent:databaseName];
sqlite3 *database;
if (sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
NSString *stmnt=[[[NSString alloc]initWithFormat:@"insert into login values(\"%@\",\"%@\",\"%@\")", key1,key2,key3] autorelease];
const char *sqlStatement = [stmnt UTF8String];
sqlite3_stmt *compiledStatement;
if (sqlite3_prepare_v2(database, sqlStatement,-1, &compiledStatement,NULL) == SQLITE_OK)
{
if (SQLITE_DONE!=sqlite3_step(compiledStatement))
{
UIAlertView *al=[[UIAlertView alloc] initWithTitle:@"INFO"
message:@"Registration Fail"
delegate:self
cancelButtonTitle:@"ok"
otherButtonTitles:nil];
[al show];
[al release];
}
else {
UIAlertView *al=[[UIAlertView alloc] initWithTitle:@"INFO"
message:@"Registerd"
delegate:self
cancelButtonTitle:@"ok"
otherButtonTitles:nil];
[al show];
[al release];
}
}
sqlite3_reset(compiledStatement);
}
sqlite3_close(database);
}
-(IBAction)clicked:(id)sender
{
NSString *t1=[[NSString alloc]initWithFormat:@"%@",txt1.text];
NSString *t5=[[NSString alloc]initWithFormat:@"%@",txt2.text];
NSString *t3=[[NSString alloc]initWithFormat:@"%@",txt3.text];
//NSString *t2=[[NSString alloc]init];
//NSInteger t3;
//NSString *t3=[[NSString alloc]init];
//t1=txt1.text;
//t2=txt2.text;
//t3=txt3.text;
[self insert:t1:t5:t3];
}
答案 2 :(得分：0)
试试这段代码：
-(void)addItem{
//for saving the data into database
if(addStmt == nil) {
const char *sql = "insert into employee(name, address) Values(?, ?)";
if(sqlite3_prepare_v2(database, sql, -1, &addStmt, NULL) != SQLITE_OK)
NSAssert1(0, @"Error while creating add statement. '%s'", sqlite3_errmsg(database));
}
sqlite3_bind_text(addStmt, 1, [name UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(addStmt, 2, [address UTF8String], -1, SQLITE_TRANSIENT);
NSLog(@"%@",name);
NSLog(@"%@",address);
if(SQLITE_DONE != sqlite3_step(addStmt))
NSAssert1(0, @"Error while inserting data. '%s'", sqlite3_errmsg(database));
else
//SQLite provides a method to get the last primary key inserted by using sqlite3_last_insert_rowid
rowID = sqlite3_last_insert_rowid(database);
//Reset the add statement.
sqlite3_reset(addStmt);
}
+ (void) getInitialDataToDisplay:(NSString *)dbPath {
//for retrieving data from database
InsertDataAppDelegate *appDelegate = (InsertDataAppDelegate *)[[UIApplication sharedApplication] delegate];
if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {
const char *sql = "select name, address from employee";
sqlite3_stmt *selectstmt;
if(sqlite3_prepare_v2(database, sql, -1, &selectstmt, NULL) == SQLITE_OK) {
while(sqlite3_step(selectstmt) == SQLITE_ROW) {
NSInteger primaryKey = sqlite3_column_int(selectstmt, 0);
//NSInteger primaryKey = sqlite3_column_int(selectstmt, 0);
Item *Obj = [[Item alloc]initWithPrimaryKey:primaryKey];
Obj.name = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 0)];
Obj.address=[NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)];
Obj.isDirty = NO;
[appDelegate.array addObject:Obj];
[Obj release];
}
}
}
else
sqlite3_close(database); //Even though the open call failed, close the database connection to release all the memory.
}
答案 3 :(得分：0)
插入的另一种方法是
// Create insert statement for the address
NSString *insertStatement = [NSString stringWithFormat:@"INSERT INTO ADDRESS (STREETNAME, STREETNUMBER, PERSONID) VALUES (\"%@\", \"%@\", \"%d\")", person.address.streetName, person.address.streetNumber, personID];
if ( sqlite3_exec(databaseHandle, [insertStatement UTF8String], NULL, NULL, &error) == SQLITE_OK)
{
NSLog(@"Person inserted.");
}
else
{
NSLog(@"Error: %s", error);
}
答案 4 :(得分：0)
- (IBAction)sbumitbuttoncliked:(id)sender
{
sqlite3 *database;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"somefile1.sqlite"];
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK)
{
sqlite3_stmt *statment = nil;
NSString *queryString = [NSString stringWithFormat:@"Insert into form1 (name,password,phoneno)values(\'%@\',\'%@\',\'%@\')",textobj1.text, textobj2.text,textobj3.text];
NSLog(@"%@",queryString);
const char *sql = [queryString UTF8String];
sqlite3_prepare_v2(database, sql, -1, &statment, NULL);
if (textobj1.text.length==0||textobj2.text.length==0||textobj3.text.length==0) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Success" message:@"Not Registered " delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil ];
[alert show];
}
else if (sqlite3_step(statment) == SQLITE_DONE)
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Success" message:@"you have successfully registered" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil ];
[alert show];
[self dismissModalViewControllerAnimated:YES];
}
sqlite3_finalize(statment);
}