10.8. Adding Tables to a Database
Problem
You need to add a table to an existing database.
Solution
Use the CREATE
TABLE
statement.
The sample code executes the DDL statement—using the
ExecuteNonQuery( )
method of the
Command
object—to add a table to an existing
SQL Server database.
The C# code is shown in Example 10-8.
Example 10-8. File: AddTableToDatabaseForm.cs
// Namespaces, variables, and constants using System; using System.Configuration; using System.Data; using System.Data.SqlClient; // . . . SqlConnection conn = new SqlConnection( ConfigurationSettings.AppSettings["Sql_ConnectString"]); String createSql = "CREATE TABLE MyTable " + "(MyTableId int IDENTITY(1,1) PRIMARY KEY CLUSTERED)"; SqlCommand cmd = new SqlCommand(createSql, conn); // Create the table in the database. try { conn.Open( ); cmd.ExecuteNonQuery( ); resultTextBox.Text = "Table created successfully"; } catch (System.Exception ex) { resultTextBox.Text = ex.ToString( ); } finally { if (conn.State == ConnectionState.Open) conn.Close( ); }
Discussion
There are two categories of SQL statements:
- Database Definition Language (DDL)
Used to manage all objects in the database, generally with
CREATE
,ALTER
, andDROP
statements to create, modify, and delete objects, respectively. These statements generally require DBA permissions to execute.- Database Management Language (DML)
Used to manipulate—select, insert, update, and delete—data in the database objects. Database objects are defined using DDL.
The solution executes a DDL
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