if(@datetime1<>'1990-01-01' and @datetime2<>'1990-01-01')
begin
set @sqlwhere=@sqlwhere+' and DateTime>='+@datetime1 + ' and DateTime<='+@datetime2
end两个变量是这样定义的
@datetime1 datetime,
@datetime2 datetime,
现在报错老是说
System.Data.SqlClient.SqlException: Syntax error converting datetime from character string.
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.SqlClient.SqlCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
at WebService1.Service1.fileInfo_storedProcess(String cmd1, String loginname, String articleno, String pagecount, String tablecount, String figcount, String equcount, String newfile, String onlineearly, String revise, String vouchar, String datetime1, String datetime2) in d:\inetpub\wwwroot\webservice1\service1.asmx.cs:line 1533请指点。
begin
set @sqlwhere=@sqlwhere+' and DateTime>='+@datetime1 + ' and DateTime<='+@datetime2
end两个变量是这样定义的
@datetime1 datetime,
@datetime2 datetime,
现在报错老是说
System.Data.SqlClient.SqlException: Syntax error converting datetime from character string.
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.SqlClient.SqlCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
at WebService1.Service1.fileInfo_storedProcess(String cmd1, String loginname, String articleno, String pagecount, String tablecount, String figcount, String equcount, String newfile, String onlineearly, String revise, String vouchar, String datetime1, String datetime2) in d:\inetpub\wwwroot\webservice1\service1.asmx.cs:line 1533请指点。
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begin
set @sqlwhere=@sqlwhere + ' and DateTime >= ''' + @datetime1 + ''' and DateTime <= ''' + @datetime2 + '''
end
1 :普通SQL语句可以用Exec执行 eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2:字段名,表名,数据库名之类作为变量时,必须用动态SQL eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 当然将字符串改成变量的形式也可
declare @fname varchar(20)
set @fname = 'FiledName' --设置字段名 declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句会报错 declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句正确 3. 输出参数
declare @num int,
@sqls nvarchar(4000)
set @sqls='select count(*) from tableName'
exec(@sqls)
--如何将exec执行结果放入变量中? declare @num int,
@sqls nvarchar(4000)
set @sqls='select @a=count(*) from tableName '
exec sp_executesql @sqls,N'@a int output',@num output
select @num
begin
set @sqlwhere=@sqlwhere+ 'and DateTime>='+cast(@datetime1 as varchar)+' and DateTime<= '+cast(@DateTime2 as varchar)
end