at the top
using System.Data.SqlClient;
in the main body (perhaps a click event)
//creates a connection object with a given connection string
SqlDataConnection conn = New SqlDataConnection("connection String");
//creates a command object with the sql and the connection it is to use
SqlCommand cmd = new SqlCommand("SQL String",conn);
//create a data reader to store the data retrieved from the database
SqlDataReader rdr;
//open the connection
conn.Open();
//executes the sql and stores the result in the rdr (Use if there is more than one //cell retrieved from database e.g all records where a value is greater than 0
rdr = cmd.ExecuteReader();
//if there is only one cell retrieved such as only the orderid for a specific order then //use:
variable = cmd.ExecuteScalar();
//then do something with the data WARNING: the connection MUST be open to use the data reader but not with the scalar method
//close the connection
conn.Close();
Hope this helps!
steve
Connect to a SQL Server, query with Transact-SQL (T-SQL), and view the results with the mssql plugin for Visual Studio Code. The SQL Database projects extension for VS Code comes with the mssql extension, which supports SQL projects on Windows, macOS, and Linux. To learn more about data science please visit- Learnbay.co
kill urself
A BLOB is a binary large object which is a chunk of data for a database. An mblob is a medium blob used in php code for an SQL databse.
We can done with the help of Primary concept in Sql Server.
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SQL
The SQL data base is programming language used to manipulate and retrieve data. Included in the language are elements such as data insert, query, update and delete.
The name of a statement written to retrieve specific data from a table is a SQL SELECT statement.
SqlDataReader
select * from "table-name" where month="required month";
rollback command can retrieve deleted data from a table, provided commit has not been performed after deleting the data. both rollback and commit are transaction control statements.
The SQL command that can be used to retrieve all data from a table is the SELECT Ex: Let us say we have a table called employee_master which contains 3 columns emp_name, emp_number, date_of_joining you can retrieve all the data by using the below command SELECT * FROM employee_master or SELECT emp_name, emp_number, date_of_joining FROM employee_master
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SQL is a relational database management system. The very first function of this software is to keep the data safe and retrieve it When it is asked by other software applications.
The SQL Server Express is used to store and retrieve data when requested by other software operations that are running within the same computer or network.
SQL queries allow you to search for and retrieve data from a database. By writing SELECT statements with specific criteria, you can search for information in tables and retrieve the results based on your query.