C#的DBHelper，方便大家复制直接用，改一下数据库就行了。
目录
环境：
DBHelper:
数据库：
测试：
环境：
系统：win10 工具：Visual Studio 2019 数据库：sqlserver
DBHelper:
代码语言：javascript复制using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
namespace CShapDBHelper
{
public class DBHelper
{
private static string url = "server=.;database=girl1804;uid=sa;pwd=root";
/// <summary>
/// 获取查询信息
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static DataTable Query(string sql) {
SqlConnection conn = new SqlConnection(url);
SqlDataAdapter sdap = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
sdap.Fill(ds);
return ds.Tables[0];
}
/// <summary>
/// 修改
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static int ExecuteNonQuery(string sql) {
SqlConnection conn = new SqlConnection(url);
conn.Open();
SqlCommand cmd = new SqlCommand(sql,conn);
int rows = cmd.ExecuteNonQuery();
conn.Close();
return rows;
}
/// <summary>
/// 存储过程·一般用不到，大型项目严禁使用
/// </summary>
/// <param name="proName"></param>
/// <param name="paras"></param>
/// <returns></returns>
public static bool ExcuteProcedure(string proName, SqlParameter[] paras) {
SqlConnection conn = new SqlConnection(url);
conn.Open();
SqlCommand cmd = new SqlCommand(proName, conn);
cmd.CommandType = CommandType.StoredProcedure;
for (int i = 0; i < paras.Length; i )
{
cmd.Parameters.Add(paras[i]);
}
int rows = cmd.ExecuteNonQuery();
conn.Close();
return rows>0;
}
}
}数据库：
代码语言：javascript复制/*
Navicat SQL Server Data Transfer
Source Server : mysqlserver
Source Server Version : 120000
Source Host : .:1433
Source Database : girl1804
Source Schema : dbo
Target Server Type : SQL Server
Target Server Version : 120000
File Encoding : 65001
Date: 2022-06-12 10:44:35
*/
-- ----------------------------
-- Table structure for [dbo].[girlSix]
-- ----------------------------
DROP TABLE [dbo].[girlSix]
GO
CREATE TABLE [dbo].[girlSix] (
[id] varchar(32) NOT NULL DEFAULT (replace(newid(),'-','')) ,
[createDate] datetime NOT NULL DEFAULT (getdate()) ,
[nickName] varchar(30) NOT NULL ,
[introduce] nvarchar(200) NOT NULL
)
GO
IF ((SELECT COUNT(*) from fn_listextendedproperty('MS_Description',
'SCHEMA', N'dbo',
'TABLE', N'girlSix',
'COLUMN', N'nickName')) > 0)
EXEC sp_updateextendedproperty @name = N'MS_Description', @value = N'名字'
, @level0type = 'SCHEMA', @level0name = N'dbo'
, @level1type = 'TABLE', @level1name = N'girlSix'
, @level2type = 'COLUMN', @level2name = N'nickName'
ELSE
EXEC sp_addextendedproperty @name = N'MS_Description', @value = N'名字'
, @level0type = 'SCHEMA', @level0name = N'dbo'
, @level1type = 'TABLE', @level1name = N'girlSix'
, @level2type = 'COLUMN', @level2name = N'nickName'
GO
IF ((SELECT COUNT(*) from fn_listextendedproperty('MS_Description',
'SCHEMA', N'dbo',
'TABLE', N'girlSix',
'COLUMN', N'introduce')) > 0)
EXEC sp_updateextendedproperty @name = N'MS_Description', @value = N'介绍'
, @level0type = 'SCHEMA', @level0name = N'dbo'
, @level1type = 'TABLE', @level1name = N'girlSix'
, @level2type = 'COLUMN', @level2name = N'introduce'
ELSE
EXEC sp_addextendedproperty @name = N'MS_Description', @value = N'介绍'
, @level0type = 'SCHEMA', @level0name = N'dbo'
, @level1type = 'TABLE', @level1name = N'girlSix'
, @level2type = 'COLUMN', @level2name = N'introduce'
GO
-- ----------------------------
-- Records of girlSix
-- ----------------------------
INSERT INTO [dbo].[girlSix] ([id], [createDate], [nickName], [introduce]) VALUES (N'04e3d962adcb4a5b8fefaf8b46995e85', N'2020-05-27 09:05:52.000', N'董新颖', N'郭老师关门弟子之一。');
GO
INSERT INTO [dbo].[girlSix] ([id], [createDate], [nickName], [introduce]) VALUES (N'568fc305930347d3bec1ddd08c71ad29', N'2020-05-27 09:01:09.000', N'王笑涵', N'北方有佳人，绝世而独立。');
GO
INSERT INTO [dbo].[girlSix] ([id], [createDate], [nickName], [introduce]) VALUES (N'972ec358089042e0bf24fd9efca47bde', N'2020-05-27 08:59:49.000', N'牛龙珠', N'笑若桃花三月开，清风徐徐醉颜来。');
GO
INSERT INTO [dbo].[girlSix] ([id], [createDate], [nickName], [introduce]) VALUES (N'BDFFC6A36A53408281EB8CA242C0E7A3', N'2020-05-27 08:42:31.000', N'闫春娜', N'珠缨旋转星宿摇,花蔓抖擞龙蛇动。');
GO
INSERT INTO [dbo].[girlSix] ([id], [createDate], [nickName], [introduce]) VALUES (N'd1cdd67717e549caba16503787b55877', N'2021-02-17 15:27:41.357', N'小龙女', N'想过过过儿过过的日子');
GO
INSERT INTO [dbo].[girlSix] ([id], [createDate], [nickName], [introduce]) VALUES (N'efb0ca854dac456b9d8c42d4c4b1bce0', N'2020-05-27 09:03:30.000', N'刘梓佳', N'明眸善睐，辅靥承权，瑰姿艳逸，怡静体闲，端的是好一个花王，富贵的牡丹。');
GO
INSERT INTO [dbo].[girlSix] ([id], [createDate], [nickName], [introduce]) VALUES (N'f839343b980e45caafaa9d2c9797294b', N'2020-05-27 09:04:53.000', N'魏慧娟', N'脉脉眼中波，盈盈花盛处。');
GO
-- ----------------------------
-- Indexes structure for table girlSix
-- ----------------------------
-- ----------------------------
-- Primary Key structure for table [dbo].[girlSix]
-- ----------------------------
ALTER TABLE [dbo].[girlSix] ADD PRIMARY KEY ([id])
GO测试：
代码语言：javascript复制using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CShapDBHelper
{
class Program
{
static void Main(string[] args)
{
GetList(null);
//添加
string id = System.Guid.NewGuid().ToString("N");
string addSql = string.Format("insert into girlSix values('{0}','{1}','{2}','{3}')",id,DateTime.Now,"夏天","保持每天好心情。");
int rows = DBHelper.ExecuteNonQuery(addSql);
Console.WriteLine(rows>0?"增删改通用成功": "NonQuery Error");
//查询
GetList(id);
}
/// <summary>
/// 查询
/// </summary>
public static void GetList(string id) {
string sql = "select * from girlSix";
if (!string.IsNullOrEmpty(id)) {
sql = string.Format(" where id='{0}'",id);
}
DataTable dt = DBHelper.Query(sql);
for (int i = 0; i < dt.Rows.Count; i )
{
Console.WriteLine(dt.Rows[i][0]);
Console.WriteLine(dt.Rows[i][1]);
Console.WriteLine(dt.Rows[i][2]);
Console.WriteLine(dt.Rows[i][3]);
}
}
}
}
