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  • dotNet Web 3.0
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      • Span<T> struct
      • C# - What's new?
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    • Concurrency
      • Understand differences between Concurrency vs Multi-threading vs Asynchronous
      • Concurrency: An Overview
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      • How to run Background Tasks in ASP.NET
    • Refactoring
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      • Making Method Calls Simpler
      • Dealing with Generalization
    • Product deploying, software installation
      • Create, configure, and publish a web package (.NET Web Profile)
      • Publishing Web Services
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      • File transfer services: FTP, TFTP
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      • The basic difference between HTTP and HTTPS protocols
  • Construction Web
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      • ASP.NET Core
        • Application startup
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        • Application model
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        • IActionConstraint
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    • Web Services
      • REST
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        • Routing
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      • Token based security
      • SingalR
      • Serialization Frameworks
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    • Microservices and Cloud
      • Microservices architecture
      • Dockerize a .NET Core application
      • Development workflow for Docker apps
    • JavaScript, HTML, CSS
      • JavaScript: Variables
      • JavaScript: Data types and types conversion
      • JavaScript: Operators
      • JavaScript: Control and Loop constructions
      • JavaScript: Functions, Execution Context and Variables scopes
      • JavaScript: Arrays
      • JavaScript: JS in WebBrowser and basic DOM manipulations
      • HTML: Basic elements
      • CSS: Simple Style rules
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      • Box model
      • HTML: Standards and Browser compatibility
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      • HTML: Frames
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      • CSS: Tables properties
      • CSS: Flexbox
      • Different storage
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      • JavaScript: Closure
      • AJAX/JSON
      • Ecma script 6: OOP
      • Promise
      • Strict mode of javascript
    • JavaScript Frameworks
      • Selecting elements
      • Operating on collection
      • Manipulating with elements, working with properties, attributes and data
      • Events
      • animation and effects
      • utilities and Ajax
      • SPA (SINGLE PAGE APPLICATIONS)
      • EcmaScript 6
      • UI frameworks basics:
      • NPM basics:
      • React basics
  • Construction DB
    • SQL
      • Tables, relationships, keys, constraints understanding
      • DDL, DML, DCL understanding
      • SQL data types
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      • Data manipulation (insert, update, delete)
      • Retrieving data (simple select statement)
      • Joins understanding
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      • Combining the results of multiple queries (UNION, EXCEPT, INTERSECT, MINUS, subqueries)
      • Sessions, transactions, locks
      • Isolation levels understanding
      • Implementing stored procedures, user-defined functions, triggers
      • Cursors
    • Data Access Layer
      • Manage connection strings and objects
      • Working with data providers
      • Connect to a data source by using a generic data access interface
      • Handle and diagnose database connection exceptions
      • Manage exceptions when selecting, modifying data
      • Build command objects and query data from data sources
      • Retrieve data source by using the DataReader
      • Manage data by using the DataAdapter and TableAdapter
      • Updating data
      • Entity Framework
        • Query data sources by using EF
        • Code First to existing DB
        • Entity Data Modeling Fundamentals
        • Querying Data
        • Data modification
  • Verification
    • Code Quality
      • MSDN: Guidelines for Names
      • SDO Best Practices Catalog - Coding Standards
      • SDO Best Practices Catalog - Code Review Process
      • SDO Best Practices Catalog - Automatic Code Inspection
      • Automated coding standards enforcement (StyleCop, Resharper)
      • Code Reviews and Toolset
      • Use Work Items (TODO, BUG etc.)
      • Preemptive Error Detection
      • Desirable characteristics of a design (minimal complexity, ease of maintenance, minimal connectednes
      • Creating high quality classes
      • Creating high quality methods
      • Guidelines for initializing variables
      • Exceptions and error handling techniques
      • Best practices of working with data types
      • Code commenting practices
    • Automated Testing (principles, patterns, and practices)
      • Software testing basic concepts
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      • Test Case
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      • Types of test doubles (Stub, Mock, Spy, Fake, Dummy)
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      • Goals of Unit Testing, What Makes a Test Valuable?
      • Styles of Unit Testing (Output / State / Collaboration)
      • Good unit test properties
      • F.I.R.S.T Principles of unit testing
      • Test Pyramid concept
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      • Breaking the dependency, Interaction testing
      • Strategies for isolating the database in tests
      • Test smells and how to avoid
      • Test Organization patterns
      • Fixture setup patterns
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      • Feature-driven development (FDD)
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      • Acceptance testing, Acceptance Test Driven Development (ATDD)
      • Continuous testing
    • Automated Testing (Frameworks, Tools, Libraries)
      • .NET unit test frameworks overview
      • .NET Mocking Frameworks, a comparison
      • xUnit
        • Primary test framework attributes
        • Asserts
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        • Skipping Tests
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        • Data-driven Tests
      • NSubstitute
        • Mocking Method Calls (Using Mock Object, Return Values, Argument Matching)
        • Behavior Verification (Method Was/Not Called, a Specific Number of Times, Getter/Setter Was Called)
        • Throwing exceptions
        • Raising Events from Mock Objects
        • Returning Different Results for Sequential Calls
      • AutoFixture
      • EF Core InMemory test
      • Integration tests in ASP.NET Core
      • Isolating database data in integration tests
      • Test ASP.NET Core MVC apps
  • Configuration Management
    • Product builds and Continuous Integration
      • Automated build concept
      • Dotnet cli
      • CI/CD Basic concepts
    • Managing Versions
      • Fundamental concepts: revisions, working copy, repository, branch, baseline, trunk
      • Versioning Models
      • Distributed Version Control basics
      • Distributed systems advantages and weak sides
      • VCS Management life-cycle on (one of) major tools (clone, commit, update, revert, merge, resolve, et
      • Branching/Merging strategies
      • Blaming (annotate)
      • Revision graph/log actions (Git)
      • Integrating with Issue Tracking Systems
      • Source control Best Practices
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On this page
  • DataAdapter
  • TableAdapter
  1. Construction DB
  2. Data Access Layer

Manage data by using the DataAdapter and TableAdapter

DataAdapter

DbDataAdapter object is used to retrieve and update data between a data table and a data store.

If the connection is open, the DbDataAdapter uses the open connection and leaves the connection open. If the connection is closed, DbDataAdapter opens the connection, uses it, and then closes it automatically.

DbDataAdapter has a SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand properties.

Fill method

The Fill method moves data from the data store to the DataTable object you pass into this method. The Fill method has several overloads, some of which accept only a data set as a parameter. When a data set is passed to the Fill method, a new DataTable object is created in the data set if a source DataTable object is not specified.

var cmd = (SqlCommand)connection.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT CustomerID, CompanyName FROM Customers";
var da = new SqlDataAdapter(cmd);
var nwSet = new DataSet("nw");
da.Fill(nwSet, "Customers");
MessageBox.Show("DataSet Filled");

Saving Changes

The Update method saves the data table modifications to the database by retrieving the changes from the data table and then using the respective InsertCommand, UpdateCommand, or DeleteCommand property to send the appropriate changes to the database on a row-by-row basis.

For the Update method to work, all four commands must be assigned to the DbDataAdapter object.

Normally, this means creating individual DbCommand objects for each command. Another way to populate the DbDataAdapter object’s commands is to use the DbCommandBuilder object.

var cmd = connection.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT * FROM Customers";
var da = new SqlDataAdapter(cmd);
var nwSet = new DataSet("nw");
var bldr = new SqlCommandBuilder(da);
da.Fill(nwSet, "Customers");

//Add new row
customersTable.Rows.Add("AAAAA", "Five A Company");

//send changes to database
da.Update(nwSet, "Customers");

DON’T EXECUTE TWICE! If you execute this code twice, an exception will be thrown indicating that you are trying to insert duplicate rows.

One way to increase update performance is to send the changes to the database server in batches by assigning a value to the DbDataAdapter object’s UpdateBatchSize property. This property defaults to 1, which causes each change to be sent to the server on a row-by-row basis.

TableAdapter

A TableAdapter component fills a dataset with data from the database, based on one or more queries or stored procedures that you specify.

TableAdapters can also perform adds, updates, and deletes on the database to persist changes that you make to the dataset. You can also issue global commands that are unrelated to any specific table.

TableAdapters are generated by Visual Studio designers. If you are creating datasets programmatically, then use DataAdapter, which is a .NET class.

NorthwindDataSet northwindDataSet = new NorthwindDataSet();

NorthwindDataSetTableAdapters.CustomersTableAdapter customersTableAdapter = 
    new NorthwindDataSetTableAdapters.CustomersTableAdapter();

customersTableAdapter.Fill(northwindDataSet.Customers);

Methods

Member

Description

TableAdapter.Fill

Populates the TableAdapter's associated data table with the results of the TableAdapter's SELECT command.

TableAdapter.Update

Sends changes back to the database and returns an integer that represents the number of rows affected by the update.

TableAdapter.GetData

Returns a new DataTable that's filled with data.

TableAdapter.Insert

Creates a new row in the data table.

TableAdapter.ClearBeforeFill

Determines whether a data table is emptied before you call one of the Fill methods.

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Last updated 5 years ago