使用C#直接修改表结构（添加列，删除列）【MS SQL SEVER】

using System;
using System.Data.SqlClient;

namespace ConsoleApp
{
    /// <summary>
    ///     使用C#直接修改表结构（添加列，删除列）【MS SQL SEVER】
    ///     https://www.cnblogs.com/LifeDecidesHappiness/p/15411540.html
    ///     LDH @ 2021-10-15
    /// </summary>
    internal class Program
    {
        public static void Main()
        {
            Console.Title = "使用C#直接修改表结构（添加列，删除列）【MS SQL SEVER】";

            // 添加列
            AddColumnIntoTableInMsSqlServer();

            // 删除列
            //DeleteColumnFromTableInMsSqlServer();

            Console.ReadKey();
        }

        /// <summary>
        ///     使用C#直接修改表结构（添加列）【MS SQL SEVER】
        /// </summary>
        public static void AddColumnIntoTableInMsSqlServer()
        {
            var tableName = "CollegeInfo"; // 要插入列的表名
            var columnName = "CollegeArea"; // 要插入列的列名
            var columnControl = "nvarchar(100) null"; // 要插入列的类型限制

            // 添加列
            var sqlStrAddColumn = $"alter table {tableName} add {columnName} {columnControl}";

            // 数据库连接字符串
            var conStr = "Data Source=.;Initial Catalog=TestDB;User ID=sa;Password=123456";

            using (var con = new SqlConnection(conStr))
            {
                con.Open();

                using (var cmd = new SqlCommand(sqlStrAddColumn, con))
                {
                    try
                    {
                        cmd.ExecuteNonQuery();
                        Console.WriteLine("【修改表结构】添加列 成功!");
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine(e);
                        Console.WriteLine("【修改表结构】添加列 失败!");
                        throw;
                    }
                }
            }
        }

        /// <summary>
        ///     使用C#直接修改表结构（删除列）【MS SQL SEVER】
        /// </summary>
        public static void DeleteColumnFromTableInMsSqlServer()
        {
            var tableName = "CollegeInfo"; // 要插入列的表名
            var columnName = "CollegeArea"; // 要插入列的列名

            // 删除列
            var sqlStrDeleteColumn = $"alter table {tableName} drop column {columnName}";

            // 数据库连接字符串
            var conStr = "Data Source=.;Initial Catalog=TestDB;User ID=sa;Password=123456";

            using (var con = new SqlConnection(conStr))
            {
                con.Open();

                using (var cmd = new SqlCommand(sqlStrDeleteColumn, con))
                {
                    try
                    {
                        cmd.ExecuteNonQuery();
                        Console.WriteLine("【修改表结构】删除列 成功!");
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine(e);
                        Console.WriteLine("【修改表结构】删除列 失败!");
                        throw;
                    }
                }
            }
        }
    }
}

 

 

 

 

 

/*
    SQL-建表CollegeInfo语句
*/
USE TestDB;
GO

IF EXISTS (SELECT * FROM sys.tables WHERE name = 'CollegeInfo')
BEGIN
    DROP TABLE CollegeInfo;
END;


CREATE TABLE CollegeInfo
(
    Name NVARCHAR(100) NOT NULL,
    Type NVARCHAR(10) NOT NULL,
    [Year] NVARCHAR(4) NOT NULL
        DEFAULT '2021',
    Sponsor NVARCHAR(100) NOT NULL,
    Remark NVARCHAR(MAX) NOT NULL
);

SELECT Name,
       Type,
       Year,
       Sponsor,
       Remark
FROM dbo.CollegeInfo;