Complex query using 'sql like' statement.

Question

Given the following basic class structure.
public class Project {
     private String name;
     private Architecture architecture;
     private Resources resources;
     public Architecture getArchitecture();
     public void setArchitecture(Architecture architecture);
     public Resources getResources();
     public void setResources();
     public String getName();
     public void setName(String name);
public Architecture {
     private String name;
     public String getName();
     public void setName(String name);
public Resources {
     private String name;
     public String getName();
     public void setName(String name);
we want to be able to do a query like:
     find all Projects where (Project.name.indexOf("a") > 0) &&
(Project.architecture.name.indexof("b") > 0)
In essence a "like" comparison across String properties of the JDO objects.
Is it supported in KODO?? Anyone tried it out? Also, is it possible to
generate SQL type query in KODO?
rgds
NK

Answer 1

Note that this relies on a current bug in Kodo -- we should escape out the
'%' character, but we don't.
Some day, we'll fix that bug. But, before then, we will introduce a proper,
supported mechanism for finding records that have a string field that
contains some substring.
-Patrick
On 5/30/02 6:12 PM, "Andrew" <[email protected]> wrote:
Hi,
I wanted to perform a LIKE statement to get records where the partial string
existed in a field -> eg. select a where a.field LIKE "SPRING" - 2 records,
SpringSteen & MindSprings
I did it like this:
setFieldName("Spring");
String sFilter = "field.startsWith(%\" + getFieldName() + \"%)"; -
Extent anExtent = pm.getExtent(this.getClass(), true);
Query aQuery = pm.newQuery(this.getClass(), anExtent, sFilter);
return (Collection) aQuery.execute();
Hope it helps. oh, don't know about the generating sql query.
Nitin Kanani wrote:
Given the following basic class structure.
public class Project {
private String name;
private Architecture architecture;
private Resources resources;
public Architecture getArchitecture();
public void setArchitecture(Architecture architecture);
public Resources getResources();
public void setResources();
public String getName();
public void setName(String name);
public Architecture {
private String name;
public String getName();
public void setName(String name);
public Resources {
private String name;
public String getName();
public void setName(String name);
we want to be able to do a query like:
find all Projects where (Project.name.indexOf("a") > 0) &&
(Project.architecture.name.indexof("b") > 0)
In essence a "like" comparison across String properties of the JDO
objects.
Is it supported in KODO?? Anyone tried it out? Also, is it possible to
generate SQL type query in KODO?
rgds
NK
Patrick Linskey [email protected]
SolarMetric Inc. http://www.solarmetric.com