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>>> titles1 = [page.title for page in page_q.filter(model.Page.id==1)] 2008-09-04 22:40:24,236 INFO sqlalchemy.engine.base.Engine.0x..30 SELECT page.id AS page_id, page.content AS page_content, page.posted AS page_ posted, page.title AS page_title, page.heading AS page_heading FROM page WHERE page.id = 2008-09-04 22:40:24,236 INFO sqlalchemy.engine.base.Engine.0x..30 [1] >>> titles2 = [page.title for page in page_q.filter_by(id=1)] 2008-09-04 22:40:40,098 INFO sqlalchemy.engine.base.Engine.0x..30 SELECT page.id AS page_id, page.content AS page_content, page.posted AS page_posted, page.title AS page_title, page.heading AS page_heading FROM page WHERE page.id = 2008-09-04 22:40:40,101 INFO sqlalchemy.engine.base.Engine.0x..30 [1] >>> titles1 == titles2 True The same results are obtained whether the filter() or filter_by() syntax is used. java qr code generator tutorial QR Code Scanner no Superdownloads - Download de jogos ...
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8 May 2019 ... In this article, we will look at how to use the Zxing QR code generation library and JFreeSVG library to create a QR Code SVG image in Java . n this chapter, we discuss message authentication codes (MACs) and digital signature schemes. Recall from Section 1.5 that a MAC is a sequence of bits that can be attached to a message to verify where it originated and that it has not been tampered with. We will describe two types of MACs: one based on block ciphers and one based on hash functions. The MACs we describe require the sender and receiver to share a key. In many cases, it might be useful to allow anyone (without possession of a shared key) to be able to verify the originator of message, and we will thus describe how digital signatures allow you to do so. There are many other types of MAC and signature schemes that have been developed in this chapter, we sample just a few of the more commonly used. Choosing the right MAC and signature schemes for your software design may sometimes be a nontrivial decision, and we encourage you to consult a security expert prior to doing so. The goal of this chapter is to give you some fluency in exploring potential solutions and discussing the options with a security expert. We first introduce secure hash functions as they are used as a component in the MAC and digital signature schemes we describe. microsoft word 2007 qr code generator, barcode reader in asp.net c#, asp.net barcode, java barcode reader sample code, crystal reports qr code generator, c# gs1 128 qr code generator with javascript How To Create QR Codes in Java & Servlet - ViralPatel.net
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Oct 24, 2010 · QR Code readers are as easy as pie on smartphones such as the iPhone ... That said, scanning QR Codes with Java apps has, by and large, ... Hash functions, as used in the world of cryptography, have some similarities to and differences from traditional hash functions. Hash functions in the world of computer science map a long string to a shorter one. Hash functions are used, for instance, to help construct hash tables in which data is stored into buckets for quick accesses. A hash function is used to determine which bucket the data should be placed in. As such, the goal of a traditional hash function is to evenly balance the data across all the buckets in the hash table. However, cryptographic hash functions have additional goals. A secure cryptographic hash function H takes as input some (potentially large) string M. It produces a message digest, MD = H(M), that has a few properties: 1. Efficiency: It should not take a lot of computational time or CPU cycles to compute H(M) even for a potentially large message. 2. Pre-image resistance: Given H(M), it should be computationally infeasible to determine M. M is often called the pre-image of the hash H(M), and H is sometimes referred to as a one-way function. 3. Collision resistance: It is computationally infeasible to find two distinct input messages M1 and M2 (M1 M2) for which H(M1) = H(M2). It is also possible to use table columns as an argument to filter() rather than object attributes. Here s an example: >>> filtered_page_q = page_q.filter(model.page_table.c.title.like(u'%page%')) >>> page = filtered_page_q.first() 2008-09-04 23:23:33,128 INFO sqlalchemy.engine.base.Engine.0x..30 SELECT page.id AS page_id, page.content AS page_content, page.posted AS page_ posted, page.title AS page_title, page.heading AS page_heading FROM page WHERE page.title LIKE LIMIT 1 OFFSET 0 2008-09-04 23:23:33,136 INFO sqlalchemy.engine.base.Engine.0x..30 [u'%page%'] >>> page.title u'Test Page' Notice that the return value from filter() or filter_by() is another query object, so you can further manipulate the results or apply more filters. You can also create more complex expressions using AND, OR, and NOT: >>> from sqlalchemy.sql import and_ >>> page = page_q.filter(and_(model.Page.title.like(u'%page%'), model.page_table.c.id==1)).first() 2008-09-04 23:24:51,196 INFO sqlalchemy.engine.base.Engine.0x..30 SELECT page.id AS page_id, page.content AS page_content, page.posted AS page_posted, page.title AS page_title, page.heading AS page_heading FROM page WHERE page.title LIKE AND page.id = LIMIT 1 OFFSET 0 2008-09-04 23:24:51,196 INFO sqlalchemy.engine.base.Engine.0x..30 [u'%page%', 1] >>> page.title u'Test Page' qr code scanner for java free download Java Code Examples com.google. zxing . qrcode .QRCodeReader
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