I am trying to read a table having five rows and columns. I have used sql.eachRow function to read eachRow and assign the value to a String. I am getting an error "Groovy:[Static type checking] - No such property: MachineName for class: java.lang.Object"
My code:
sql.eachRow('select * from [MACHINES] WHERE UpdateTime > :lastTimeRead, [lastTimeRead: Long.parseLong(lastTimeRead)])
{ row ->
def read = row.MachineName
}
but MachineName is my column name. How can i overcome this error.
Using dynamic Properties with static type checking is not possible*.
However, eachRow will pass a GroovyResultSet as first parameter to the Closure. This means that row has the type GroovyResultSet and so you can access the value using getAt
row.getAt('MachineName')
should work. In groovy you can also use the []-operator:
row['MachineName']
which is equivalent to the first solution.
*) without a type checking extension.
If you Know the Column name you can just use the Below.
"$row.MachineName"
But if you don't Know column name or having some issue, still it can be accessed using an array of Select.
sql.eachRow('select * from [MACHINES] WHERE UpdateTime > :lastTimeRead, [lastTimeRead: Long.parseLong(lastTimeRead)])
{ row->
log.info "First value = ${row[0]}, next value = ${row[1]}"
}
Related
I have a source table which just has one row:
So i stored the value from Values_per_Country into a parameter:
I want to use this parameter into my SELECT transformation(schema modifier),
but this error comes up:
Is there a way around this,so i can use values from the source tables?
You can create a Lookup activity to get the column values of source table. And then pass to the parameter in Data Flow. Finally, your expression type == 'double' && position > 0 && position <= $parameter3 will work.
Screenshot:
Expression in the below image: #activity('Lookup1').output.firstRow['Values_per_Country']
In my ABAP report I have some structure:
data:
begin of struct1,
field1 type char10,
end of struct1.
I can access to it's field field1 directly:
data(val) = struct1-field1
or dynamically with assign:
assign ('struct1-field1') to field-symbol(<val>).
Also I have some internal table:
data: table1 like standard table of struct1 with default key.
append initial line to table1.
I can access to column field1 of first row directly:
data(val) = table1[ 1 ]-field1.
But I can not get access to field1 with dynamic assign:
assign ('table1[ 1 ]-field1') to field-symbol(<val>).
After assignment sy-subrc equals "4".
Why?
The syntax of ASSIGN (syntax1) ... is not the same as the syntax of the Right-Hand Side (RHS) of assignments ... = syntax2.
The syntax for ASSIGN is explained in the documentation of ASSIGN (variable_containing_name) ... or ASSIGN ('name') ... (chapter 1. (name) of page ASSIGN - dynamic_dobj).
Here is an abstract of what is accepted:
"name can contain a chain of names consisting of component selectors [(-)]"
"the first name [can be] followed by an object component selector (->)"
"the first name [can be] followed by a class component selector (=>)"
No mention of table expressions, so they are forbidden. Same for meshes...
Concerning the RHS of assignments, as described in the documentation, it can be :
Data Objects
They can be attributes or components using selectors -, ->, =>, which can be chained multiple times (see Names for Individual Operands
Return values or results of functional methods, return values or results of built-in functions and constructor expressions, or return values or results of table expressions
Results of calculation expressions
Sandra is absolutely right, if table expressions are not specified in help, then they are not allowed.
You can use ASSIGN COMPONENT statement for your dynamicity:
FIELD-SYMBOLS: <tab> TYPE INDEX TABLE.
ASSIGN ('table1') TO <tab>.
ASSIGN COMPONENT 'field1' OF STRUCTURE <tab>[ 1 ] TO FIELD-SYMBOL(<val>).
However, such dynamics is only possible with index tables (standard + sorted) due to the nature of this version of row specification. If you try to pass hashed table into the field symbol, it will dump.
I created two string variables (tot and tot_value) and assigned a value (tot = MyVal) for testing. Then I created an Execute SQL Task which takes (tot) as parameter and the value returned is saved in tot_value.
In the General Tab, i set:
ResultSet to Single row. SQL Source Type to Direct input Query is listed below.
In Parameter Mapping I selected my tot variable with Input DirectionSQL_VARCHAR Data Type 1 as Parameter Name (Since i am using ODBC)Size set to default -1.
In Result SetResult Name to 1Variable Name to tot_value.
If in the query I hard code 'MyVal' i get the correct result, however when I use ? to use my variable as a parameter, I always get a 0 returned.
Note that my tot variable is set to MyVal
Any clue of what I might be missing? Thanks in advance
select TOP 1 CAST('' + ISNULL((SELECT distinct type_of_transfer_code
FROM SYSTEM.history_program_transfer
WHERE type_of_transfer_value = ?),'') AS VARCHAR(100)) as type_of_transfer_code
FROM SYSTEM.table_facility_defaults
When you map a table to an object, every property created corresponds to one db column.
I want to execute a db function on a column before it gets mapped to the property, so the property gets the value returned by the db function, and not the column
I was trying to achieve that by Expression property of ColumnAttribute (as in the example below), so instead of BirthDate the usrFn_UTCToLocalTime(BirthDate) is returned
but it does not seem to be working and still gets pure value of the column.
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage = "_BirthDate", DbType = "DateTime", UpdateCheck = UpdateCheck.Never, Expression = "dbo.usrFn_UTCToLocalTime(BirthDate)")]
public System.Nullable<System.DateTime> BirthDate
{
get
{
return this._BirthDate;
}
}
I have also modified the DBML XML as in:
other post on stackoverflow
but also without result.
Is that possible by using LINQ or do I have to overwrite a getter which costs roundtrip to the server?
According to the Remarks section on this MSDN page, the Expression property of the ColumnAttribute is used when calling CreateDatabase, so it won't work the way you intend unless you created your database with Linq to Sql.
You can create a Linq query that selects the various columns and calls the db function in one statement like this (based on MSDN example):
var qry = from person in db.Persons
select new {
FirstName = person.FirstName,
LastName = person.LastName,
BirthDate = person.BirthDate,
Dob = db.usrFn_UTCToLocalTime(person.BirthDate)
};
This projects into an anonymous type, but you could use a non-anonymous type as well. For the sake of the example, I've got a table named Person with FirstName, LastName, and BirthDate columns, and a user defined scalar function named usrFn_UTCToLocalTime. The sql statement sent to the server is:
SELECT [t0].[FirstName], [t0].[LastName], [t0].[BirthDate], CONVERT(DateTime,[dbo].[usrFn_UTCToLocalTime]([t0].[BirthDate])) AS [Dob]
FROM [dbo].[Person] AS [t0]
As I was suggesting in the question, for now I have overwritten the get method so I have:
get
{
using (var context = DB.Data.DataContextFactory.CreateContext())
{
return context.usrFn_UTCToLocalTime(_BirthDate);
}
//return this._BirthDate;
}
But with every access to the property, roundtrip is made - which is not my intention but gives a proper result.
I leave the question still open
I'm using mksqlite to create and access an SQL database from matlab, and I want to get the number of rows in a table. I've tried this:
num = mksqlite('SELECT COUNT(*) FROM myTable');
, but the returned value isn't very helpful. If I put a breakpoint in my script and examine the variable, I find that it's a struct with a single field, called 'COUNT(_)', which seems to actually be an invalid name for a field, so I can't access it:
K>> class(num)
ans =
struct
K>> num
num =
COUNT(_): 0
K>> num.COUNT(_)
??? num.COUNT(_)
|
Error: The input character is not valid in MATLAB statements or expressions.
K>> num.COUNT()
??? Reference to non-existent field 'COUNT'.
K>> num.COUNT
??? Reference to non-existent field 'COUNT'.
Even the MATLAB IDE can't access it. If I try to double click the field in the variable editor, this gets spat out:
??? openvar('num.COUNT(_)', num.COUNT(_));
|
Error: The input character is not valid in MATLAB statements or expressions.
So how can I access this field?
You are correct that the problem is that mksqlite somehow manages to create an invalid field name that can't be read. The simplest solution is to add an AS clause to your SQL so that the field has a sensible name:
>> num = mksqlite('SELECT COUNT(*) AS cnt FROM myTable')
num =
cnt: 0
Then to remove the extra layer of indirection you can do:
>> num = num.cnt;
>> num
num =
0