Map data into HashMaps: HashMap of List of HashMaps
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Key: IBATIS-265
URL: http://issues.apache.org/jira/browse/IBATIS-265
Project: iBatis for Java
Type: Improvement
Reporter: Stefan Friedrich
Priority: Minor
We tried to implement the HashMaps as results for our queries. The problem is,
that whenever a HashMap is set as the resultClass, a queryForObject is called
and so, every select can only return ONE result. In our application we expect a
list of HashMaps at certain locations. The solution for our problem would be
very simple and - in our opinion - would work with only three new lines of code:
The Method BasicResultMap.getResults(RequestScope request, ResultSet rs) the
targetType for further calls is set:
if (resultClass == null) {
throw new SqlMapException("The result class was null when trying to get
results for ResultMap named " + getId() + ".");
} else if (Map.class.isAssignableFrom(resultClass)) {
columnValues[i] = getNestedSelectMappingValue(request, rs, mapping,
Object.class);
} else if (DomTypeMarker.class.isAssignableFrom(resultClass)) {
Class javaType = mapping.getJavaType();
if (javaType == null) {
javaType = DomTypeMarker.class;
}
columnValues[i] = getNestedSelectMappingValue(request, rs, mapping,
javaType);
} else {
Probe p = ProbeFactory.getProbe(resultClass);
Class type = p.getPropertyTypeForSetter(resultClass,
mapping.getPropertyName());
columnValues[i] = getNestedSelectMappingValue(request, rs, mapping,
type);
}
The part that needs to be changed is in the first "else-Statement".
if (resultClass == null) {
throw new SqlMapException("The result class was null when trying to get
results for ResultMap named " + getId() + ".");
} else if (Map.class.isAssignableFrom(resultClass)) {
Class javaType = mapping.getJavaType();
if (javaType == null) {
javaType = Object.class;
}
columnValues[i] = getNestedSelectMappingValue(request, rs, mapping,
javaType);
} else if (DomTypeMarker.class.isAssignableFrom(resultClass)) {
Class javaType = mapping.getJavaType();
if (javaType == null) {
javaType = DomTypeMarker.class;
}
columnValues[i] = getNestedSelectMappingValue(request, rs, mapping,
javaType);
} else {
Probe p = ProbeFactory.getProbe(resultClass);
Class type = p.getPropertyTypeForSetter(resultClass,
mapping.getPropertyName());
columnValues[i] = getNestedSelectMappingValue(request, rs, mapping,
type);
}
As you can see, the changes would have no effect, if no javaType was set. But
for our concerns, we would set the javaType to java.util.ArrayList and
everything would be just fine!
Stefan
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