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#SQL

16

SQL is a standard language for storing, manipulating and retrieving data in relational databases.

During runtime I build an object which is essentially a wrapper over in-memory table:

col1 ... colN
val11 ... valN1
val12 ... valN2

I want to use this object as a part of INSERT or UPDATE queries, based on a value of some column (the main use case one of the columns is an ID value)

What's the best way to expose the object to SQL?

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This tells me that there is no timezone offset on this table/field:

Select TOP 1 GETDATE() as Now, TimeCreated FROM ens.messageheader ORDER BY TimeCreated DESC;
Now TimeCreated
------------------- -------------------
2016-10-18 16:16:49 2016-10-18 16:16:31
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If I have defined a class query in one of my classes and I want to use that query from a method of another class, what are the pros and cons of using the %SQL.Statement interface versus the %Library.ResultSet interface?

I believe %SQL.Statement is the newer interface.

So if the old way is:

USER>s rs=##class(%Library.ResultSet).%New("%Library.File:FileSet")
 
USER>s sc=rs.Execute("c:\s\","*.txt")
 
USER>w sc
1
USER>while rs.%Next() {w !,rs.Data("Name")}

...

then the new way is:

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I want to override the Get and Set methods of a class property. The class maps to a pre-existing global. The property is defined like so:

Property Invalid As %Library.Boolean;

with the property mapping to a node like ^GLOBAL(Code,"INVALID")=1
Code is a property in the same class.

The value can be 0 or 1 or the node might not exist. When it doesn't exist I want the value of the SQL field to come out as 0 (false).

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Introduction

The field test of Caché 2016.2 has been available for quite some time and I would like to focus on one of the substantial features that is new in this version: the document data model. This model is a natural addition to the multiple ways we support for handling data including Objects, Tables and Multidimensional arrays. It makes the platform more flexible and suitable for even more use cases.

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I am trying to make architecture for my project. And for it, it needs to make list property in which there is list of objects of another table, the data must be unique, therefore I make sql-query to check objects of another table if it is used or not, but I can't make sql-query to check elements in list in property with elements of another table. Can you help me? In property ID of object is used.

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Hi! I have a complex SQL select query which I execute via %ResultSet. It also includes a UNION. The select statement within the union should only be done when an external parameter is set, and I'm not sure of way of doing that within SQL, other than something like

SELECT FOO FROM BAR

WHERE (some conditions)

UNION

SELECT FOO2 FROM BAR2

WHERE :doUnion = 1 AND (some conditions)

...this works, but I don't think it's particularly optimal as I believe it will still execute the second SELECT regardless of :doUnion. It's also sort of hard to read...

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Question
· Jan 24, 2023
SQL Query needs optimization

Hi All,

I am having an SQL query (mentioned below). When I am running this query it is taking 90 min to retrieve all records (approx 1 million records).

Fetching data from 5 tables using inner join in cache. Relative cost displaying 10 million

I wan to confirm How this query can be optimized

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Hi ,

I have a code written in cache sql and trying to understand it, below is the code , can anyone help me understand what does that mean

ex - !! dosage_unit !!

SELECT (CASE WHEN (order_description IS NULL OR (order_description='')) THEN '' ELSE (order_description) END) !! (CASE WHEN (dosage IS NULL OR dosage_unit IS NULL OR (dosage='') OR (dosage_unit='')) THEN '' ELSE (', ' !! dosage !! ' ' !! dosage_unit !!

Thank You in advance.

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Hi everyone, i cant understand what is wrong in my query:

ALTER TABLE MyNamespace.MyTable ALTER COLUMN CurrentColumnName RENAME NewColumnName

I just want to rename column name using sql.

I could not find any life example using this syntax.

SQLCODE for this query is -25:

-25 Input encountered after end of query

Quote from documentation:

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Question
· Dec 13, 2017
SQL or Cache Function?

Hi -

I'm creating a custom report in Health Insight via SQL and one of the requirements says that I must include patients who are >= 13 years old (which is easy) but I also need to include patients who WILL be 13 years old as of December 31st of current year that the report is ran in.

I see that there is an Age column and an AgeInMonths column in HSAA.Patient. and of course a DOB column. I'm wondering if it is possible to do this purely using SQL (and SQL functions) or if I will have to incorporate a COS function to achieve this requirement.

Any suggestions?

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I have generated a class using the linked procedure wizard however I can't get it to work if the datatype of one of the parameters is VARCHAR(MAX). It works fine if I change it to say VARCHAR(500) and rerun the stored procedure wizard.

I get the following error returned.:

ErrorMsg: SQLState: (07002) NativeError: [0] Message: [Microsoft][ODBC SQL Server Driver]COUNT field incorrect or syntax error

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When using the JSON_OBJECT() function in Caché SQL on a %String property that contains JSON syntax, it converts the %String into a JSON object instead of escaping it as a string literal. How can I prevent this? (without ridiculous hacks like "add a space to the beginning of the value" as we don't always know which properties will contain these values and I certainly don't want to have to check for nulls and add/remove a space every single place this value is used in the application)

I don't want these strings automatically marshalled into JSON objects.

For example:

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Hi Dev Community,

I have a persistent Document class that has a FileName string property and another Question class that has an optional one-to-many relationship with Document.

I'm trying to add a SqlComputed property to the Question class (docFileName) where docFileName = Document.FileName if there is a related Document or an empty string if there isn't one.

I'd prefer the property to be SqlComputed so that if Question.Document changes, Question.docFileName will automatically update.

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Hi developers!

As you probably noticed in IRIS 2021 the names of globals are random.

And if you create IRIS classes with DDL and want to be sure what global was created you probably would want to provide a name.

And indeed you can do it.

Use WITH %CLASSPARAMETER DEFAULTGLOBAL='^GLobalName' in CREATE Table to make it work. Documentation. See the example below:

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HI,

I have made a query with class definitions and all their properties and put them in a view.

All is good besides Parameters is showing junk characters. Is there a way to do it cleanly besides getting into the code??

SELECT
CC.ID As CompiledClass,
CC.SqlSchemaName,
CC.SqlTableName,
CP.Name As PropertyName,
CP.SqlFieldName,
CP.Type,
PD.Parameters

FROM %Dictionary.CompiledProperty CP
JOIN %Dictionary.CompiledClass CC
ON CP.Parent = CC.ID

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I have a table, with autoincremented id

CREATE TABLE users (
    id SERIAL NOT NULL,
    name VARCHAR(30) NOT NULL,
    PRIMARY KEY (id)
)

I can add a new item there with an explicit id 

INSERT INTO users (id, name) VALUES (2, 'fred')

And while my id is autoincremented, I can omit it

INSERT INTO users (name) VALUES ('ed')

So, this time, I don't know the id, and I want to somehow get it.

I could do it with LAST_IDENTITY() function, but it just uses %RowID, and have no relation to the primary id

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Is it possible to retrieve the SQL-Executing process ID (PID) from a process spawned from a UNION %PARALLEL? I have a value set in the SQL-Executing process that I need to replicate in the UNION %PARALLEL spawned process(es). The SQL-Executing process writes the value to a global subscripted by its PID so determining the SQL-Executing PID from the spawned process is what I need. I expected $ZPARENT from the spawned process would hold the SQL-Executing PID but the PID returned is different.

With thanks,

Michael Hill

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The Caché System Management Portal includes a robust web-based SQL query tool, but for some applications it’s more convenient to use a dedicated SQL client installed on a user’s PC.

SQuirreL SQL is a well known open source SQL client built in Java, which uses JDBC to connect to a DBMS. As such, we can configure SQuirreL to connect to Caché using the Caché JDBC driver.

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