zxing/iphone/legacy/Barcodes_original/Classes/Database.m

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//
// Database.m
// ZXing
//
// Created by Christian Brunschen on 29/05/2008.
/*
* Copyright 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "Database.h"
#import "Scan.h"
@implementation Database
static sqlite3_stmt *maxIdStatement;
static sqlite3_stmt *selectAllStatement;
static sqlite3_stmt *insertStatement;
static sqlite3_stmt *deleteStatement;
@synthesize connection;
@synthesize nextScanIdent;
static Database *sharedDatabase = nil;
+ (id)sharedDatabase {
if (!sharedDatabase) {
sharedDatabase = [[self alloc] init];
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"scans.db"];
success = [fileManager fileExistsAtPath:writableDBPath];
if (!success) {
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"scans.db"];
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
if (!success) {
NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
}
}
sqlite3 *connection;
sqlite3_open([writableDBPath UTF8String], &connection);
sharedDatabase.connection = connection;
static const char *maxIdSql = "SELECT MAX(id) FROM SCAN";
sqlite3_prepare_v2(connection, maxIdSql, -1, &maxIdStatement, NULL);
static const char *selectAllSql = "SELECT id, text, stamp FROM SCAN ORDER BY id";
sqlite3_prepare_v2(connection, selectAllSql, -1, &selectAllStatement, NULL);
static const char *insertSql =
"INSERT INTO SCAN (id, text, stamp) VALUES (?, ?, ?)";
sqlite3_prepare_v2(connection, insertSql, -1, &insertStatement, NULL);
static const char *deleteSql = "DELETE FROM SCAN WHERE id = ?";
sqlite3_prepare_v2(connection, deleteSql, -1, &deleteStatement, NULL);
if (SQLITE_ROW == sqlite3_step(maxIdStatement)) {
int maxId = sqlite3_column_int(maxIdStatement, 0);
sharedDatabase.nextScanIdent = maxId + 1;
sqlite3_reset(maxIdStatement);
} else {
NSLog(@"failed to read max ID from database\n");
}
}
return sharedDatabase;
}
- (void)addScanWithText:(NSString *)text {
sqlite3_bind_int(insertStatement, 1, nextScanIdent++);
sqlite3_bind_text(insertStatement, 2, [text UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_double(insertStatement, 3, [[NSDate date] timeIntervalSince1970]);
sqlite3_step(insertStatement);
sqlite3_reset(insertStatement);
}
- (NSArray *)scans {
NSMutableArray *scans = [NSMutableArray array];
while (SQLITE_ROW == sqlite3_step(selectAllStatement)) {
int ident = sqlite3_column_int(selectAllStatement, 0);
NSString *text = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectAllStatement, 1)];
NSDate *stamp = [NSDate dateWithTimeIntervalSince1970:sqlite3_column_double(selectAllStatement, 2)];
Scan *scan = [[Scan alloc] initWithIdent:ident text:text stamp:stamp];
[scans addObject:scan];
[scan release];
}
sqlite3_reset(selectAllStatement);
return scans;
}
- (void)deleteScan:(Scan *)scan {
sqlite3_bind_int(deleteStatement, 1, [scan ident]);
sqlite3_step(deleteStatement);
sqlite3_reset(deleteStatement);
}
@end