Connection string
A connection string is a structured configuration value specifying how a client connects to a data source or service, including its location and connection parameters.
Building Web APIs with ASP.NET Core
A connection string is a configuration value that specifies how an application connects to a data source, often including server, database, and credentials.
- How it is used
- Connects the board-game API’s ApplicationDbContext to its SQL Server database.
- How deep it goes
- Shows credential setup, configuration storage, and DbContext registration, but does not dissect the connection-string options.
- Examples
- Uses a MyBGList SQL Server value named DefaultConnection and a Program.cs AddDbContext registration.
- What you can do after
- Apply it via EF Core to configure ApplicationDbContext for SQL Server and then create database structure with migrations.
Read how Building Web APIs with ASP.NET Core explains connection string →
Build Python Web Apps with Streamlit
A connection string is a structured value containing the address, port, credentials, and database name needed to connect to a data service.
- How it is used
- Configures the PostgreSQL connection used by a Streamlit CRUD app for persistent storage and retrieval.
- How deep it goes
- Defines the URL fields and works through local and hosted configuration, without detailing PostgreSQL connection internals.
- Examples
- Shows a local `secrets.toml` URL and a Neon Quick Start URL for a hosted database.
- What you can do after
- Operate/configure it by supplying the appropriate PostgreSQL URL for a local or Neon-hosted Streamlit SQL connection.
Read how Build Python Web Apps with Streamlit explains connection string →
Learn PowerShell Scripting in a Month of Lunches, Second Edition: Write and organize scripts and tools
A connection string is a formatted set of information that identifies a data source and specifies connection and authentication settings.
- How it is used
- Connects PowerShell automation to a selected SQL Server database with the required authentication settings.
- How deep it goes
- Explains server, database, authentication, SqlConnection assignment, opening, error detection, and closing without covering broader production administration.
- Examples
- Uses SQL Server Express strings for localhost, master, Scripting, Windows authentication, and explicit username-password authentication.
- What you can do after
- Operate/configure PowerShell database connections and reuse one connection string across module functions.
MongoDB 8.0 in Action, Third Edition
A connection string is a configuration string that specifies how a client connects to a database deployment, including its address and connection options.
- How it is used
- Configures client access to a MongoDB deployment from mongosh, a Node.js application, or an SQL interface.
- How deep it goes
- Explains SRV server discovery and demonstrates connection commands, but does not detail the full URI option syntax.
- Examples
- Uses mongosh connection commands and a Node.js script that queries routes from JFK.
- What you can do after
- Apply it via mongosh or the Node.js driver to connect a client to an Atlas deployment.
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Pro ASP.NET Core 7, Tenth Edition
A connection string is a configuration value that specifies how software connects to a data source such as a database.
- How it is used
- Supplies database location and connection options for ASP.NET Core applications using Entity Framework Core or Identity.
- How deep it goes
- Defines JSON placement, single-line formatting, LocalDB values, and EF Core lookup, while deferring broader configuration-file behavior.
- Examples
- Uses LocalDB databases named SportsStore, Products, People, CalcDb, and Identity.
- What you can do after
- Configure a database connection by storing a named value in appsettings.json and passing its configuration key to AddDbContext.
Read how Pro ASP.NET Core 7, Tenth Edition explains connection string →
.NET in Action, Second Edition
A connection string is a configuration string that specifies how an application connects to a data source and its connection options.
- How it is used
- Selects SQLite's in-memory or file-based storage mode for an EF Core relational-database example.
- How deep it goes
- Explains SQLite storage selection and the in-memory lifetime caveat, but gives no file-based connection-string example.
- Examples
- Uses `DataSource=manningbooks;mode=memory;cache=shared` and keeps a SQLite connection open.
- What you can do after
- Configure SQLite to use a shared in-memory database and keep it alive with an open connection.
Read how .NET in Action, Second Edition explains connection string →
Building Distributed Applications that Work
A structured configuration value specifying how an application connects to a database.
- How it is used
- Connects Aspire services to existing databases or hosted resources through named configuration values.
- How deep it goes
- Shows registration, settings lookup, endpoint extraction, and resource-generated values; defers internally hosted database setup.
- Examples
- Uses an existing database, an Ollama model consumed by Semantic Kernel, and a MailDev SMTP resource.
- What you can do after
- Apply it via Aspire to supply an existing database connection or extract and validate an Ollama endpoint.
Read how Building Distributed Applications that Work explains connection string →
Related concepts
- appsettings.jsonconfigured by · appsettings.json is a conventional JSON configuration file used by .NET applications to store application settings.
- mongorestoreconfigures · mongorestore is a MongoDB Database Tools utility that restores data from BSON dump archives into a MongoDB database.
- IConfigurationused by · IConfiguration is the .NET abstraction for reading hierarchical application settings aggregated from configured key-value sources.
- mongoshused by · mongosh is MongoDB’s interactive command-line shell for connecting to deployments and executing database commands and queries.
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