postgres transaction

Tags: select Name records width INF from HTTP POST VATThe first step is to download the Postres driver on the Internet, after installation,: https://www.devart.com/odbc/postgresql/download.htmlSecond step to create an ODBC data sourceClick "Start-" control Panel-"Management tools-" data source (ODBC)-"User dsn-" Add "Write VBA code after the installation is configured.private Sub CommandButton1_Click () Dim CNN as New ADODB. Connection Dim rs as New ADODB. Recordset Dim dataBase As String Dim us

Tags: Data Manager man OWIN EPS 3.1 lib Apt-get codeSteps that worked for me Ubuntu 8.04.2 on to removepostgres 8.3 List all Postgres Related packages dpkg-l | grep postgresii PostgreSQL 8.3.17-0ubuntu0.8.04.1 Object-relati Onal SQL Database (latest VERSIII postgresql-8.3 8.3.9-0ubuntu8.04 Object-relationa L SQL Database, version 8.3ii postgresql-client 8.3.9-0ubuntu8.04 front-end programs F or PostgreSQL (latest Veii postgresql-client-8.3 8.3.

Test Database Database Name: Test Database Table Name: Users Table Structure: Column nameData TypeAllowed to be emptyNoteUSERSIDIntFalsePrimary Key, auto-incrementing IDUsernameVarchar (50)FalseUser name, unique constraintPasswordVarchar (50)False InArticleBefore starting, we must first make it clear that a transaction is a single unit of work. If a transaction succeeds, all data modifications mad

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Transferred from: http://blog.csdn.net/yufenghyc/article/details/45869509--1 Examplepostgres=# Select 1/4;? column?----------0(1 row)In PG If you want to do division and want to keep decimals, the method above does not work, because the "/" Operation results are rounded, and the fractional part is truncated.--2 Type Conversionspostgres=# Select round (1:: Numeric/4:: Numeric,2);Round-------0.25(1 row)Note: After the type conversion, you can retain the fractional part.--3 can also be converted by

selectextract (ISOYEAR fromfromdate_) asyear_,--the year in which the week was made extract (WEEKFROM fromdate_) asweek_,--the year in which the week was made To_char (fromDate _, ' YYYYMMDD ') asfromdate_,--Week start date to_char (todate_, ' YYYYMMDD ') as End date of todate_--week from (select (date (curDate) -7*weeks_) asfromDate_, (date (curdate) -7*weeks_+6) as toDate_from (selectgenerate_series (1,100) weeks_, -- interval weeks (sequence, here take 100 weeks) cast (Date_trunc (' Week ',

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1 ImportPSYCOPG22 ImportPsycopg2.extras3 4conn = Psycopg2.connect (Database=self.dbname, User=self.username, Password=self.password, Host=self.host, port=self.port)5cursor = Self.conn.cursor (cursor_factory=psycopg2.extras.DictCursor)6sql =""7 cursor.execute (SQL)8rows =Self.cursor.fetchall ()9 #The elements in the rows at this point are the structure of the rowdict type,Ten forRowinchrows: One Printrow['a column name'] AccessReference: Http://yuanjun.me/postgresql/pythoncao-zuo-postgresql#

Pear::D B is the choice of a ADODB database, in addition to the Postgres, this article describes how to use DB to join the database with an example Installing pear is not covered in this article. In pear, the class that joins the database has the following: 1 "MDB"; 2 "MDB2: Because MDB2 's author has been looking forward to PDO into release status, so far MDB2 has been beta version;" 3 "PDO: Connection speed should be the fastest, is a C module, but

Every movie needs a director and every rented movie needs to exist in the store. How does we make sure something in another table exists before inserting new data? This lesson would teach us about foreign keys and references.CREATE TABLEdirectors (ID SERIALPRIMARY KEY, nameVARCHAR( -)UNIQUE not NULL);CREATE TABLEMovies (id SERIALPRIMARY KEY, titleVARCHAR( -) not NULL, release_date date, Count_starsINTEGER, director_idINTEGER REFERENCESdirectors (ID));Now, if we try to insert to movies table som