/**
* Method to return if it is valid to select the specified mapping for the specified statement for
* this datastore adapter. Sometimes, dependent on the type of the column(s), and what other
* components are present in the statement, it may be invalid to select the mapping. This
* implementation returns true, so override in database-specific subclass as required.
*
* @param stmt The statement
* @param m The mapping that we want to select
* @return Whether it is valid
*/
public boolean validToSelectMappingInStatement(SelectStatement stmt, JavaTypeMapping m) {
if (m.getNumberOfDatastoreMappings() <= 0) {
return true;
}
for (int i = 0; i < m.getNumberOfDatastoreMappings(); i++) {
Column col = m.getDatastoreMapping(i).getColumn();
if (col.getJdbcType() == JdbcType.CLOB || col.getJdbcType() == JdbcType.BLOB) {
// "The ... data type cannot be selected as DISTINCT because it is not comparable."
if (stmt.isDistinct()) {
NucleusLogger.QUERY.debug(
"Not selecting " + m + " since is for BLOB/CLOB and using DISTINCT");
return false;
} else if (stmt.getNumberOfUnions() > 0) {
NucleusLogger.QUERY.debug(
"Not selecting " + m + " since is for BLOB/CLOB and using UNION");
return false;
}
}
}
return true;
}
