Importing table data from one schema to another schema

Hi All,
I exported tablerows only of Schema A, and same I am trying to imported in Schema B.
While importing I am getting oracle error "row rejected, Integrity constraint violated
parent key not found".
What I did is I disabled all the constraints through script in Schema B, and imported data. Data imported successfully, but while executing the enabling the constraints script in Schema B constraints are not enabled due to parent and chile relationship problems, even I executed this script many times.
Note:- Schema A and Schema B are same structure, Schema A contains data but
Schema B does not
Can any body have any idea on this?
Thanks,

Hi,
But I want data to be completely imported without losing.
I am trying to disable the constraints using the following queries for enabling and
disabling
select 'ALTER TABLE '||A.TABLE_NAME||' DISABLE CONSTRAINT '||B.CONSTRAINT_NAME||';'
FROM user_constraints A, USER_CONSTRAINTS B
WHERE A.TABLE_NAME = B.TABLE_NAME
AND A.CONSTRAINT_TYPE = 'P'
Foreign constraints -
select 'ALTER TABLE '||A.TABLE_NAME||' DISABLE CONSTRAINT '||B.CONSTRAINT_NAME||';'
FROM user_constraints A, USER_CONSTRAINTS B
WHERE A.TABLE_NAME = B.TABLE_NAME
AND A.CONSTRAINT_TYPE = 'R'
-- Check constraints ---
select 'ALTER TABLE '||A.TABLE_NAME||' DISABLE CONSTRAINT '||B.CONSTRAINT_NAME||';'
FROM user_constraints A, USER_CONSTRAINTS B
WHERE A.TABLE_NAME = B.TABLE_NAME
AND A.CONSTRAINT_TYPE = 'C'

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