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:
- 1、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
- 2、SqlServer如何用Sql语句自定义聚合函数
- 3、sql日期格式问题?#附近有语法错误
- 4、C#中使用SQLServer的方法
- 5、hibernate的配置文件中的格式化sql语句是什么意思 就是 format_sql
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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