ruby sqlite3 tutorial

= ' Snake '= "Snake"IRB (main):003:0> puts "Hello, #{friend}"Hello, Snake.= NilIRB (main):004:0> friend = ' Queit '= "Queit"IRB (main):005:0> puts "Hello, #{friend}"Hello, Queit.= NilHere we can see the following points:Do not declare variablesEach Ruby code will return a valueSingle quotation marks for direct interpretationDouble quotation marks contain strings that are replaced by stringsProgramming modelRuby is a purely object-oriented language. A

Tutorial on the basic usage of Regular Expressions in Ruby programs, ruby Regular Expressions Most of Ruby's built-in types are similar to other programming languages. Mainly include strings, integers, floats, and arrays. However, only script languages such as Ruby, Perl, and awk provide support for built-in expression

not a hint: * * This file contains an SQLite 2.1 database * * The following error is reported when the PHP environment does not open the configuration supported above: Fatal error:call to undefined function sqlite_open () sqlite3 Example: '; $dbh->exec ("INSERT into itlife365 values (1, ' itlife365.com ')"); Echo ' Insert Data OK'; $dbh->begintransaction (); $sth = $dbh->prepare (' SELECT * from itlife365 '); $sth->execute ();//Get result $result = $

Tutorial on creating and using hash in Ruby and ruby hash Hash is a set of key-value pairs similar to "employee" => "salary. Hash indexes are completed by any key of any object type, rather than an integer index. Others are similar to arrays. The hash traversal order by key or value seems random, and is generally not in the insertion order. If you try to access

Practical tutorial for importing data from sqlite3 to mysql, sqlite3mysql Preface Sqlite3 is small and lightweight, but does not support concurrent access. When the website concurrency is large, the database Request queue is long, which may cause the database operation to time out at the end of the queue and thus the operation fails. Therefore, you must switch to

1. Auxiliary methods2. StringEnter "IRB" into the ruby command-line development environment, and the controller starts by executing "rails console" on the command line.(1) String connection>>"foo"+"bar"="foobar" (2) Interpolation by special syntax #{}>>first_name="Amy" ="Amy">>" #{first_name} Sun"+"Amy Sun "(3) The difference between a single-quote string and a double-quote string: Single-quote strings they really are literal values, contain only the

) does the index record the number of the corresponding data block, to speed up the search, what is the structure of the save??Update alias Problem:In the current testing process, it is found that SQLite does not support the use of aliases in update, for example:Update task as T set t.state = 4 where T.taskid = 65Description requires considerable attention when executing SQL statementsPrecautionsSQLite database saved content encoding format may be UTF-8 or GBK encoding, directly start Sqlite.exe

Before you start About this tutorial Ruby on Rails (rails) is a full-stack WEB application framework written in Ruby, and Ruby is a rich, free, extensible, portable, object-oriented scripting language. Rails is very popular among WEB application developers. With it, you can quickly and efficiently develop We

tutorial to understand the MySQL basics. The following is an example of a "testdb" connection to the MySQL database: #!/usr/bin/ruby-w require "DBI" begin # Connect to MySQL server DBH = Dbi.connect ("DBI:Mysql:TESTDB:localhost" , "TestUser", "test123") # Gets the server version string, and displays row = Dbh.select_one ("Select VERSION ()") puts "server Version:

Basic Ruby tutorial, 1. Basic Ruby knowledge 1. Ruby Ruby is a scripting language Ruby is an object-oriented language Ruby is a cross-platform language

Learn Ruby with me.by TigerNote: This tutorial reproduces free game Pioneer Forum, copyright belongs to the author Tiger.First articleSecond articleFirst ArticlePrefaceI'm going to start learning Ruby from today. What do you say, I haven't seen you? A new person to write a tutorial. With my strong perseverance, scienti