#mysqlconnect

[sandhyamodi]

How to connect mysql database in Python

Python needs a MySQL driver to access the MySQL database, in case this driver is not installed you can install "MySQL Connector". by using PIP. Once  "MySQL Connector" is installed, you can use the code below to connect your mysql database import mysql.connector mydb = mysql.connector.connect(   host="localhost",   user="dbrname",   passwd="dbpassword" ) # you must create a Cursor object. It will let # you execute all the queries you need cur = mydb.cursor() # Use all the SQL you like cur.execute("SELECT * FROM MY_TABLE_NAME") # print all the first cell of all the rows for row in cur.fetchall(): print row mydb.close() Read the full article

[codeasitis]

Python MySQL Database Connection- how to install mysql connector and then how to do connectivity

You can watch this also

https://youtu.be/i3uW0Bz9sNM

[aoizen19-blog]

how to connect mysql.data to visual studio

1. Download and install the lastest .NET-Connector from www.mysql.com.

2. Add the MySQL.Data in Visual Studio to your project references (Menu: project, Properties, References).

[herolol-blog]

C# 데이터베이스 간단 연결

class database   {      

// 쿼리 접속      

MySqlConnection connection = new MySqlConnection("Server=localhost;Database=insa;Uid=root;Pwd=root;");      

// 쿼리 연결      

public void connectionDB()      

{          

connection.Open();      

}

}

[melo-code]

Se connecter à une base de données MySQL en Java

Voici un exemple de code Java pour se connecter à une base de données MySQL : import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class MySQLConnection { private Connection connection; public MySQLConnection() { String url = "jdbc:mysql://localhost:3306/mydatabase"; // l'URL de la base de données String username = "myuser"; // le nom…

[knowledgewiki]

How to convert text file into SQL insert statement?

I would upload a text file, and it will convert every row into a SQL insert statement, so it can insert into the database.

As my tried, there are 3 problems here:

it will insert 5 times the values at once

all the No. should be skip

As the strSQL, I need to insert the arrayOutput one by one to insert them all

Here is my text file

No Subject Code Subject Name Student ID Student Name Student Email Lecturer Name Lecturer Email 1 BSOA011 COMPUTERIZED PAYROLL 1751234-BSOA WONG QI YI dev.ng@outlook.com LIM BEE HUI semd2019@gmail.com 2 SEMD008 COMPUTER NETWORKING 1851234-SEMD LIM FENG FENG dev.ng@outlook.com NG WAI KONG semd2019@gmail.com 3 ITIN015 DISASTER RECOVERY MANAGEMENT 1851234-ITIN HO DENG DENG dev.ng@outlook.com SZE CHEN NEE @ SOO CHEN NEE semd2019@gmail.com 4 ECOM004 WEB DEVELOPMENT SKILLS: WEB PROGRAMMING (PHP & MYSQL) 1851234-ECOM KONG JIA WEN dev.ng@outlook.com TAN MING MING semd2019@gmail.com 5 CGDD002 PRACTICAL ICT SKILLS 1951234-CGDD CHONG SIAO YU dev.ng@outlook.com NG WAI KONG semd2019@gmail.com

Here is my code

Private Sub ReadAndReplace() Dim file_contents As String = "" locationPath = Server.MapPath("~") & "File" & filename If File.Exists(locationPath) Then Dim reader As StreamReader = My.Computer.FileSystem.OpenTextFileReader(locationPath) reader.ReadLine() 'skip first line Do While reader.Peek() <> -1 file_contents += reader.ReadLine Dim arrayOutput As String() = Split(file_contents, vbTab) Dim errMessage As String = "" Dim strConn As String = "server=localhost;port=3306; user id=root;" _ & "password=;database=school;SslMode=none" Dim oDBCon As New MySqlConnection(strConn) Try oDBCon.Open() 'INSERT RECORD Dim strSQL As String = "INSERT INTO studentinfo(subject_code, subject_name, student_id, student_name, student_email, lecturer_name, lecturer_email)VALUES('" _ & arrayOutput(1) & "','" & arrayOutput(2) & "','" & arrayOutput(3) _ & "','" & arrayOutput(4) & "','" & arrayOutput(5) _ & "','" & arrayOutput(6) & "','" & arrayOutput(7) & "');" Dim oCommand2 As New MySqlCommand(strSQL, oDBCon) oCommand2.ExecuteNonQuery() Catch ex As Exception errMessage = ex.Message Finally oDBCon.Close() End Try Loop reader.Close() End If End Sub

my output

1 Answer

Notice this line:

file_contents += reader.ReadLine

It is adding to initial file_contents variable so when it is split to create arrayOutput the top 7 array elements are always the same.

Maybe try file_contents = reader.ReadLine so you only split one line per iteration.

Archive from: https://stackoverflow.com/questions/59015510/asp-vb-net-how-to-convert-text-file-into-sql-insert-statement

from https://knowledgewiki.org/how-to-convert-text-file-into-sql-insert-statement/

[szarki9]

R intro part 2

Hi there again,

part 2 of R intro summary :)

other handy functions:

lapply - returns a list of the same length as X, each element of which is the result of applying FUN to the corresponding element of X.

sapply – returns vector, matrix or array of output from applying FUN to elements of X, more user-friendly then lapply.

vapply – tries to generate named array, has a pre-specified type of return value, so it can be safer (and sometimes faster) to use

seq, rep, sort, rev – reverse the elements, append – merge vectors, is.* – check the class of R object, as.* – convert an R object from one class to another, unlist – flatten list to a vectors

REGULAR EXPRESSIONS! – is a sequence of characters that define a search pattern.

grepl - true if a pattern is found, grep - vector of indices of the character strings that contain the pattern, in sub and gsub you can specify a replacement argument, sub only first match, gsub all the matches.

Date and POSIXct objects –

dyplr: arrange – in descending or ascending order, filter , mutate – adding new column out of the rest

ggplot2: ggplot, facet_wrap – wraps a 1d sequence of panels into 2d, expand_limits

different plots with ggplot2: + geom_col -bar plot, geom_point - points, geom_line, geom_histogram, geom_boxplot

LOADING DATA INTO R

Utils package:

read.csv, read.delim – from txt files, read.table, which.min, which.max – returns an index of min or max value in the column, in read.delim for example you can add column names and column classes

readr library:

read_csv, read_tsv – tsv files, read_delim

collectors – are used to pass information about how to interpret values in a column; col_integer, col_factors

data.table library:

fread – same as read.table, but extremely fast and easy

readxl library:

excel_sheets – prints out names of the sheets in excel, read_excel – imports excels as tbl_df, tbl, data.frame,

gdata library:

read.xls – converting excel files to csv and then reading csv files using read.csv,

XLConnect library:

loadWorkbook – a bridge between Excel file and R session, getSheets – list of sheets, readWorksheet – importing the sheet into a data frame, createSheet – create a new sheet, writeWorksheet – adding data frames to a sheet, saveWorkbook – store adapter excel file, renameSheet, removeSheet

DBI library:

dbConnect – MySQLConnection, dbListTables – list of the tables in db, dbReadTable, dbGetQuery – using query to get data from a database table, dbDisconnect

dbSendQuery, then dbFetch – fetching results of executing a query, gives the ability to fetch the query’s result in chunks rather than all at once, dbClearResult – frees the memory

Importing flat files from the web: using readr library, read_csv or read_tsv with url address.

Downloading files from the web: readxl and gdata libraries, read.xls(gdata) and then download.file or read_excel (readr).

Downloading .RData files, download.file first and then load it into the workspace with load.

httr library:

GET – to get request from the web, in result we get the response object, that provides easy access to the status code, content-type, and actual content, using content we can extract the content, and we can define what object we want to retrieve: raw object, R object (list) or a character vector.

JSON files: first GET, then content as text but we can also use jsonlite library and use fromJSON to convert character data into a list, we can pass an object as an argument or URL, we can convert data to JSON file using toJSON, prettify makes JSON files pretty and minify makes in as concise as possible.

haven library:

read_sas for SAS

read_dta for STATA, columns are imported as a labeled vector and in order to change it for R format we need to use as_factor function and then we can convert it for the wanted data type.

read_sav or read_por for SPSS, also labeled class and we need to change it to other standard R class.

foreign library:

Simple functions to import STATA data and SPSS - read.dta for STATA, read.spss for SPSS.

thanks, wait for more!

szarki9

[noredinktech]

Type-Safe MySQL Queries via Postgres

My team and I are working on NoRedInk's transition from Ruby on Rails and MySQL to Haskell and Postgres. A major benefit of our new stack (Postgres/Haskell/Elm) is type-safety between the boundaries (db to backend, backend to frontend). To ensure our code is type-safe between Haskell and Elm we use servant. Servant allows us to generate types and functions for Elm based on our APIs. To ensure type-safety between Postgres and Haskell we use postgresql-typed. This means that when we change our database schema, our Haskell code won't compile if there is a mismatch, similarly to how our Elm code won't compile if there is a mismatch with our backend endpoints. We're going to focus on type-safety between our databases and Haskell in this post and on how we introduced MySQL into this. But first, let's briefly look at how we can check out Postgres queries at compile-time.

Postgres-Typed

todos :: Int -> PGConnection -> IO [Todo] todos userId postgresConn = do rows <- pgQuery postgresConn [pgSQL|! SELECT id, description, completed FROM todos WHERE user_id = ${userId} ORDER BY id ASC |] pure (fmap todoFromRow rows)

We use Template Haskell to write SQL queries instead of a DSL, allowing our engineers to use their existing knowledge of SQL instead of having to learn some library. pgSQL is a QuasiQuoter it creates a value of type PGQuery which gets executed by pgQuery. The quasi quoted query gets verified against the database schema and executed (ignoring results and without arguments) at compile-time. This is all we need to know from postgresql-typed for this post, but I recommend checking out the docs and looking at their example.

Moving to Haskell and Postgres

Our Rails application uses a MySQL database. Gradually moving functionality/new features to Haskell often means that we need access to data that isn't yet moved. We solved this initially by creating an endpoints on our Rails application and requested the data via http. This proved to be toilsome and complicated development and deploys, and therefore made it harder for teams to commit to building things in Haskell. In order to remove this hurdle, we started to think about reading data directly from our MySQL database. We really liked postgresql-typed, because it gave us the ability to write actual SQL queries and type-safety between the database and Haskell. Unfortunatlly, there isn’t a mysql-typed, but we found an interesting solution provided by Postgres itself; foreign-data-wrappers.

Foreign Data Wrappers

Foreign Data Wrappers (short fdw) offer a way to manage remote data directly within your Postgres database. This allows us to use postgresql-typed to access the MySQL data via Postgres.

CREATE SERVER mysql-schema-name FOREIGN DATA WRAPPER mysql_fdw OPTIONS (host '${host}', port '${port}'); -- Mapping for the application user, so it can perform queries. CREATE USER MAPPING FOR ${username} SERVER mysql-schema-name OPTIONS (username '${username}', password '${passphrase}'); CREATE SCHEMA mysql-schema-name AUTHORIZATION ${username}; IMPORT FOREIGN SCHEMA ${dbname} FROM SERVER mysql-schema-name INTO mysql-schema-name;

Unfortunately, we quickly ran into problems when converting http requests to the Rails application with queries directly to MySQL. Fdw has some limitations that were blockers for use. The schema imported as a fdw is imported without any constraints other than NOT NULL. An even bigger problem was that some SQL constructs weren’t pushed down to MySQL. As an example the fdw wouldn’t forward LIMIT clauses and therefore grab all rows of a table, send them over the wire, and then apply the LIMIT in Postgres. This obviously has huge performance implications and meant that we needed to find a different solution without suffering type-safety.

Type-Safe MySQL Queries

We had three options; either find a library that would give us the guarantees we were used to from postgresql-typed for MySQL, building our own library or somehow abusing postgresql-typed. Building our own library wasn't an option because that would have exceeded the scope of this project, and we couldn't find a library that met our requirements. Fortunately, postgresql-typed allows us to access getQueryString to get the raw query string from the quasi-quoted query. This we can then execute with mysql-simple instead of postgresql-typed. This allows us to check MySQL and Postgres queries at compile time using a fdw, but connecting directly to Postgres and MySQL at runtime. Finally we can write queries to our MySQL database using the same API as for Postgres and having full type-safety between the database and Haskell.

cats :: Database.MySQL.Simple.Connection -> IO [Cat] cats mySQLConnection = do rows <- Database.MySQL.Simple.query_ mySQLConnection $ -- direct connection to MySQL remove "mysql-schema-name." $ -- ^ The schemaname (fdw) only exists during compile time. getQueryString unknownPGTypeEnv [pgSql|! SELECT id, description, color FROM mysql-schema-name.cats ORDER BY id ASC |] pure (fmap catFromRow rows)

I’ve inlined the functions from postgresql-typed and mysql-simple to keep the code examples simple. We actually have two modules MySQL and Postgres that abstract the database specific functions away allowing us to use the exact same API for both databases.

Caveats

We need to prefix tables with the schema name that we used to import the fdw (see mysql-schema-name.cats in the example above). Without the prefix the compilation won't succeed. The problem is that we don't have a schema with this name at runtime. We can simply work around this by running Text.replace "mysql-schema-name." "" sqlString before executing the query. Queries need to use standard SQL features and shouldn't rely on MySQL specific features. This is actually kind of a feature, because it forces us to write queries in a way that simplifies converting them to Postgres later.

Conclusion

While this is a nice solution for us, I don't really recommend you to use MySQL in this way. This solution allows us to simplify the transition between Rails/MySQL and Haskell/Postgres. I would love for library like postgresql-typed to exist for MySQL, but it wasn't feasable to build such a thing. Honestly, I don't even know if it would be possible. I hope this post showed you how to create a nice experience for transitioning to a different technology. Thanks for reading :heart:

Special thanks to everyone involved in building this:

Ary

Gavin

Jasper

Michael

[codecraftshop]

Deploy Springboot mysql application on Openshift

[srcraftblog]

User already has more than 'max_user_connections' active connections

[codeasitis]

Python MySQL Database Connection- how to install mysql connector and then how to do connectivity

You can watch this also

https://youtu.be/i3uW0Bz9sNM

[heykyakaru]

database connection and creating tables to related apps in Django | Django online training

#heyKyaKaru #learnOnlinePython on #youtubeVideoClasses aur #getCodeOnGithub

#MySQL #database #connect kaise kare?

#XAMPP #server kaise #install kare?

#XAMPP #server me #apache and #MySQL ko start kaise kare?

#mysqlconnect kya hai?

#mysqlconnect ki help se kaise #phpMyAdmin se #connect ho?

#Django #framework ke pre-installed #app ko kaise #activate kare?

#Django #framework me pre-installed #apps se #related #tables kaise #database me #install ho?

#Database me #created #tables ki #detail?

[globalmediacampaign]

MySQL Connector/NET 8.0.21 has been released

Dear MySQL users, MySQL Connector/NET 8.0.21 is the latest General Availability release of the MySQL Connector/NET 8.0 series. This version supports .NET Core 3.1 and the X DevAPI, which enables application developers to write code that combines the strengths of the relational and document models using a modern, NoSQL-like syntax that does not assume previous experience writing traditional SQL. To learn more about how to write applications using the X DevAPI, see http://dev.mysql.com/doc/x-devapi-userguide/en/index.html. For more information about how the X DevAPI is implemented in Connector/NET, see http://dev.mysql.com/doc/dev/connector-net. NuGet packages provide functionality at a project level. To get the full set of features available in Connector/NET such as availability in the GAC, integration with Visual Studio’s Entity Framework Designer and integration with MySQL for Visual Studio, installation through the MySQL Installer or the stand-alone MSI is required. Please note that the X DevAPI requires at least MySQL Server version 8.0 or higher with the X Plugin enabled. For general documentation about how to get started using MySQL as a document store, see http://dev.mysql.com/doc/refman/8.0/en/document-store.html. To download MySQL Connector/NET 8.0.21, see http://dev.mysql.com/downloads/connector/net/ Installation instructions can be found at https://dev.mysql.com/doc/connector-net/en/connector-net-installation.html Changes in MySQL Connector/NET 8.0.21 (2020-07-13, General Availability) Functionality Added or Changed      * The following ciphers and algorithms are deprecated for        SSH connections made using Connector/NET:        Encryptions           + 3des-cbc        Key Exchange Algorithms           + diffie-hellman-group14-sha1           + diffie-hellman-group-exchange-sha1        Message Authentication Codes           + hmac-ripemd160           + hmac-sha1           + hmac-sha1-96        (Bug #31030347) Bugs Fixed      * Connector/NET returned an error when the name of a        database or stored procedure contained one or more period        characters. Now, names with this format can be used when the name        is enclosed properly between grave accent (`) symbols; for        example, `db_1.2.3.45678`. (Bug #31237338, Bug #99371)      * An error was generated when the database name within a        connection string that was passed to MySQL 5.6 or MySQL 5.7 did        not match the casing used to search a related stored procedure.        (Bug #31173265)      * In Connector/NET 8.0.19, calling new        MySqlConnection(null) returned NullReferenceException, rather        than returning an object with a ConnectionString property equal        to String.Empty as the previous versions of Connector/NET did.        This fix restores the earlier behavior. (Bug #30791289,        Bug #98322)      * An expected empty result set generated by executing        MySQLDataReader for a stored procedure instead returned a data        table containing the @_cnet_param_value column. This fix        eliminates an internal error that affected the result set and now        GetSchemaTable() returns a null value as expected.        (Bug #30444429, Bug #97300)      * The BLOB type was inferred internally when a value or        object of type MySqlGeometry was used in different situations,        which caused to server to return either zero matching rows or an        exception. (Bug #30169716, Bug #96499, Bug #30169715, Bug #96498)      * Attempts to execute a function or stored procedure        returned a null exception unexpectedly when the caller was not        the creator of the routine. This fix introduces a mechanism to        manage null values for these cases, permits the granting of        privilege to SHOW_ROUTINE, and revises SqlNullValueException to        identify when a user account lacks adequate permission to access        a routine. (Bug #30029732, Bug #96143)      * Columns of type BIGINT in a table that was loaded using        MySqlDataReader did not include the UNSIGNED flag, even though        UNSIGNED was specified in the CREATE TABLE statement. An        exception was generated if the value of such a column exceeded        2147483647. (Bug #29802379, Bug #95382)      * The microseconds value in the return results was set to        zero consistently when SqlCommand.Prepare() was called for a        SELECT statement with a TIME(n) column. This fix revises the way        the value is produced to ensure accurate results. (Bug #28393733,        Bug #91770)      * The isolation level set for a transaction did not revert        to using the session value after the transaction finished.        (Bug #26035791, Bug #86263)      * A valid call made to the        MySqlSimpleRoleProvider.AddUsersToRoles method failed to execute        because it violated the foreign key constraint. This fix removes        an error from the code that gets the role ID. Thanks to Stein        Setvik for the patch. (Bug #25046352, Bug #83657)      * The absence of a target schema in the generated WHERE        statement produced during an Entity Framework migration caused an        error when the identical table was present in multiple databases.        This fix adds the table_schema column to the generated SQL query.        (Bug #23291095, Bug #72424) On Behalf of Oracle/MySQL Release Engineering Team, Nawaz Nazeer Ahamed https://insidemysql.com/mysql-connector-net-8-0-21/

[johnattaway]

Why Mysql_Connect Php 7 Windows

Mute one of them being a member state other than usability, as the information superhighway is right for home windows.| with 99.9% uptime pledge on hardware and assist, you could possibly count on your linux pc. The cost the ad owner pays google. Google chrome has the same user interface, here is an identical path, the computer do you want to do business challenging consistent uptime and balance, affordability, robust data center after which comparison notes. While hundreds.

The post Why Mysql_Connect Php 7 Windows appeared first on Quick Click Hosting.

https://ift.tt/37odIES from Blogger http://johnattaway.blogspot.com/2019/11/why-mysqlconnect-php-7-windows.html

[postadtw]

Godaddy Windows 虛擬主機 連結遠端MySql資料庫

Godaddy Windows 虛擬主機 連結遠端MySql資料庫

如果遇到 .NET 應用程式連結 MySql 資料庫，MySql 資料庫在Godaddy上面，可參考這篇說明：

首先.NET專案要先有 MySql.Data 的參考：

  c# 程式面：

檔案開始要using： using System.Data; using MySql.Data.MySqlClient;

//定義連線字串： static string connString = “server=XXX.XX.XXX.XX;port=3306;User Id=XXXXX;password=XXXXX;database=XXXXX;charset=utf8;”; MySqlConnection conn = new MySqlConnection();

  conn.ConnectionString = connString; if (conn.State !=…

[codecraftshop]

Deploy Springboot mysql application on Openshift

Deploy Springboot mysql application on Openshift

#openshift #openshift4 #springbootmysql #mysqlconnectivity #SpringbootApplicationWithMysql

Deploy Springboot mysql application on Openshift,spring boot with mysql on k8s,openshift deploy spring boot jar,spring boot java with mysql on kubernetes,spring boot mysql kubernetes example,spring boot with mysql on kubernetes,deploy web…