sqlserverformat的简单介绍

本篇文章给大家谈谈sqlserverformat,以及对应的知识点,希望对各位有所帮助,不要忘了收藏本站喔。

本文目录一览:

为什么在sql sever中使用format对文字格式化,提示为:'FORMAT' 不是可以识别的 内置函数名称

SELECT 0 AS ID , Convert(VARCHAR(30), GETDATE(), 0 ) AS result UNION ALL

SELECT 100 AS ID , Convert(VARCHAR(30), GETDATE(), 100) AS result UNION ALL

SELECT 1 AS ID , Convert(VARCHAR(30), GETDATE(), 1 ) AS result UNION ALL

SELECT 101 AS ID , Convert(VARCHAR(30), GETDATE(), 101) AS result UNION ALL

SELECT 2 AS ID , Convert(VARCHAR(30), GETDATE(), 2 ) AS result UNION ALL

SELECT 102 AS ID , Convert(VARCHAR(30), GETDATE(), 102) AS result UNION ALL

SELECT 2 AS ID , Convert(VARCHAR(30), GETDATE(), 2 ) AS result UNION ALL

SELECT 102 AS ID , Convert(VARCHAR(30), GETDATE(), 102) AS result UNION ALL

SELECT 3 AS ID , Convert(VARCHAR(30), GETDATE(), 3 ) AS result UNION ALL

SELECT 103 AS ID , Convert(VARCHAR(30), GETDATE(), 103) AS result UNION ALL

SELECT 4 AS ID , Convert(VARCHAR(30), GETDATE(), 4 ) AS result UNION ALL

SELECT 104 AS ID , Convert(VARCHAR(30), GETDATE(), 104) AS result UNION ALL

SELECT 5 AS ID , Convert(VARCHAR(30), GETDATE(), 5 ) AS result UNION ALL

SELECT 105 AS ID , Convert(VARCHAR(30), GETDATE(), 105) AS result UNION ALL

SELECT 6 AS ID , Convert(VARCHAR(30), GETDATE(), 6 ) AS result UNION ALL

SELECT 106 AS ID , Convert(VARCHAR(30), GETDATE(), 106) AS result UNION ALL

SELECT 7 AS ID , Convert(VARCHAR(30), GETDATE(), 7 ) AS result UNION ALL

SELECT 107 AS ID , Convert(VARCHAR(30), GETDATE(), 107) AS result UNION ALL

SELECT 8 AS ID , Convert(VARCHAR(30), GETDATE(), 8 ) AS result UNION ALL

SELECT 108 AS ID , Convert(VARCHAR(30), GETDATE(), 108) AS result UNION ALL

SELECT 9 AS ID , Convert(VARCHAR(30), GETDATE(), 9 ) AS result UNION ALL

SELECT 109 AS ID , Convert(VARCHAR(30), GETDATE(), 109) AS result UNION ALL

SELECT 10 AS ID , Convert(VARCHAR(30), GETDATE(), 10 ) AS result UNION ALL

SELECT 110 AS ID , Convert(VARCHAR(30), GETDATE(), 110) AS result UNION ALL

SELECT 11 AS ID , Convert(VARCHAR(30), GETDATE(), 11 ) AS result UNION ALL

SELECT 111 AS ID , Convert(VARCHAR(30), GETDATE(), 111) AS result UNION ALL

SELECT 12 AS ID , Convert(VARCHAR(30), GETDATE(), 12 ) AS result UNION ALL

SELECT 112 AS ID , Convert(VARCHAR(30), GETDATE(), 112) AS result UNION ALL

SELECT 13 AS ID , Convert(VARCHAR(30), GETDATE(), 13 ) AS result UNION ALL

SELECT 113 AS ID , Convert(VARCHAR(30), GETDATE(), 113) AS result UNION ALL

SELECT 14 AS ID , Convert(VARCHAR(30), GETDATE(), 14 ) AS result UNION ALL

SELECT 114 AS ID , Convert(VARCHAR(30), GETDATE(), 114) AS result UNION ALL

SELECT 20 AS ID , Convert(VARCHAR(30), GETDATE(), 20 ) AS result UNION ALL

SELECT 120 AS ID , Convert(VARCHAR(30), GETDATE(), 120) AS result UNION ALL

SELECT 21 AS ID , Convert(VARCHAR(30), GETDATE(), 21 ) AS result UNION ALL

SELECT 121 AS ID , Convert(VARCHAR(30), GETDATE(), 121) AS result

SQL Server 里面执行一下, 看看你需要哪一种格式。

SqlServer如何用Sql语句自定义聚合函数

Sql Server自定义聚合函数详细步骤

开始-

输出-

首先用VS2008/VS2005建立一个SQL Server项目,右键解决方案添加新项

点击“确定”按钮后,SQL Server项目会要求连接一个数据库,我们可以选择一个数据库

然后在工程中加入一个聚合类(joinstr.cs),如图

joinstr.cs中的最终代码如下:

using System;

using System.Data;

using System.Data.SqlClient;

using System.Data.SqlTypes;

using Microsoft.SqlServer.Server;

using System.Text;

                             

                             

[Serializable]

[SqlUserDefinedAggregate(

    Format.UserDefined, //use custom serialization to serialize the intermediate result

    IsInvariantToNulls = true, //optimizer property

    IsInvariantToDuplicates = false, //optimizer property

    IsInvariantToOrder = false, //optimizer property    

    MaxByteSize = 8000), //maximum size in bytes of persisted value

]

                             

                             

public struct JoinStr:IBinarySerialize

{

    private StringBuilder sbIntermediate;

    public void Init()

    {

       sbIntermediate = new StringBuilder();

    }

                             

    public void Accumulate(SqlString Value)

    {

                             

        if (Value == null || Value.ToString().ToLower().Equals("null"))

        {

            return;

        }

       段塌 else

        {

            sbIntermediate.Append(Value);

        }

    }

                             

    public void Merge(JionStr Group)

    {

        sbIntermediate.Append(Group.sbIntermediate);

    }

                             

    public SqlString Terminate()

    {

                                    

        return new SqlString(sbIntermediate.ToString());

    }

                             

    // This is a place-holder member field

                             

                             

    #region IBinarySerialize Members

          氏嫌                   

    public void Read(System.IO.BinaryReader r)

    {

        sbIntermediate = new StringBuilder(r.ReadString());

  歼燃手  }

                             

    public void Write(System.IO.BinaryWriter w)

    {

        w.Write(this.sbIntermediate.ToString());    

    }

    #endregion

}

在编写完上述代码后,可以使用Visual Studio来部署(右向工程,在弹出菜单上选“部署”即可)。

在执行上面的SQL语句之前,需要将SQL Server2005的clr功能打开

现在可以使用joinstr来聚合字符串了。

select [t_code_role].[role_mc] as '角色',dbo.JoinStr([t_code_right].[right_mc]+',') as '权限' from [t_data_roleright],[t_code_right],[t_code_role] where [t_data_roleright].[role_bm]=[t_code_role].[role_bm] and [t_data_roleright].[right_bm]=[t_code_right].[right_bm] group by [t_code_role].[role_mc]

sql日期格式问题?#附近有语法错误

语句和语法上都没什么错误

我把你这个宽码镇拿sqlserver上没问题

你先看看你用的库对不对,要是还是不行,看你屏幕右上角的sixin

我远程模拿看一西慎粗

C#中使用SQLServer的方法

1、添加引用

using System.Data.SqlClient;

2、建立连接调用

SqlConnection myConnection = new SqlConnection("数据库连接字符串");

//数据库连接字符串通常是Data Source=localhost;Initial Catalog=数据库名;User ID=用户名;Password=密码

        SqlCommand myCommand = new SqlCommand();

        myCommand.CommandText = string.Format("select count(*) from {0} where columName={1}",表明,列值);//构造SQL查询语句     String.Format (String, Object[]) 将指定 String 中的格式项替换为指定数组中相应 Object 实例的值的文本等效项。        myCommand.Connection = myConnection;

        

        try

        {

            myCommand.Connection.Open();

            int count = (int)myCommand.ExecuteScalar();

            if (count  0)   

            {

          //count大于0表示有,调用自己写的一个方法来更新

                UpdateData();

                

            }

            else

            {

            小于0表示没有,调用这个方法来插入            

                InsertData();

            }

        }

        catch (Exception ex)

  渗困      {

            Response.Write(ex.ToString());

        }

//UpdateData方法    

public void UpdateData()

{

  SqlConnection myConnection = new SqlConnection("数据库连接字符串");

  SqlCommand myCommand = new SqlCommand();

  myCommand.CommandText = "用来更新的SQL语句";

  myCommand.Connection = myConnection;

  try

  {

      myCommand.Connection.Open();

      myCommand.ExecuteNonQuery();

  }

  catch (Exception ex)

  {

       Response.Write(ex.ToString());

  }

}

//InsertData方法 

public void InsertData()

{

  SqlConnection myConnection = new SqlConnection("数据库连接字符串");

  SqlCommand myCommand = new SqlCommand();

  myCommand.CommandText = "用来插入的SQL语句";

  myCommand.Connection = myConnection;

  try

  {

     myCommand.Connection.Open();

     myCommand.ExecuteNonQuery();

  }

  catch (Exception ex)

  {

     Response.Write(ex.ToString());

  }

}

-----这些都是基础的写法,可以将其封装在一个工具类中,方便调用。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

namespace DBUtility

{

    public class SqlHelper

    {

        //通过配置文件(app.config:xml)读取连接字符串

        public static string connectionString = ConfigurationManager .ConnectionStrings["ConnectionString"].ConnectionString;

       

        //字段,丛陵念通过连接字符串获取连接对象

        private SqlConnection con = new SqlConnection(connectionString);

        //属性,判断连接对象的状态并打开连接对象

        public SqlConnection Con

        {

            get {

                switch (con.State)

                {

                    case ConnectionState.Broken:

                        con.Close(); //先正常关闭,汪嫌释放资源

                        con.Open();

                        break;

                    case ConnectionState.Closed:

                        con.Open();

                        break;

                    case ConnectionState.Connecting:

                        break;

                    case ConnectionState.Executing:

                        break;

                    case ConnectionState.Fetching:

                        break;

                    case ConnectionState.Open:

                        break;

                    default:

                        break;

                }

                return con; }

            set { con = value; }

        }

        //执行存储过程或者SQL语句并返回数据集DataSet

        public DataSet GetDataSet(string strSQL, CommandType cmdType, params SqlParameter[] values)

        {

            SqlCommand cmd = PrepareCommand(strSQL, cmdType, values);

            SqlDataAdapter da = new SqlDataAdapter(cmd);

            DataSet ds = new DataSet();

            da.Fill(ds);

            return ds;

        }

        //执行存储过程或者SQL语句并返回SqlDatareader

        public SqlDataReader GetDataReader(string strSQL, CommandType cmdType, params SqlParameter[] values)

        {

            SqlCommand cmd = PrepareCommand(strSQL, cmdType, values);

            SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

            return dr;

        }

        //执行存储过程或者SQL语句并返回首行首列(新增方法的主键)

        public object ExecuteScalar(string strSQL, CommandType cmdType, params SqlParameter[] values)

        {

            SqlCommand cmd = PrepareCommand(strSQL, cmdType, values);

            return cmd.ExecuteScalar();

        }

        //执行存储过程或者SQL语句并返回受影响行数

        public int ExecuteNonQuery(string strSQL, CommandType cmdType, params SqlParameter[] values)

        {

            SqlCommand cmd = PrepareCommand(strSQL, cmdType, values);

            return cmd.ExecuteNonQuery();

        }

        //内部方法,实例化命令对象并配置相关属性

        private SqlCommand PrepareCommand(string strSQL, CommandType cmdType,params SqlParameter[] values)

        {

            SqlCommand cmd = new SqlCommand();

            cmd.Connection = Con;

            cmd.CommandText = strSQL;

            cmd.CommandType = cmdType;

            cmd.CommandTimeout = 60;

            cmd.Parameters.AddRange(values);

            return cmd;

        }

    }

}

[img]

hibernate的配置文件中的格式化sql语句是什么意思 就是 format_sql

就是格式化的意思

format是mysql和access中培陵晌的函数

oracle和sqlserver中没有

不知道要格式化什么东西

日期的话,oracle中提供了to_char或者to_date函数

sqlserver提供了convert函数

字符和数字互相转化的汪扰话

oracle中有to_char和to_number函数可用

sqlserver中有convert或者cast函数可用

-------------补充-----------

通用的貌似没有配锋

oracle

select to_char(日期字段,'yyyy-mm-dd hh24:mi:ss') from 表名

sqlserver

select convert(varchar, getdate(), 120 ) from 表名

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