finish modify columns

src/main/java/com/ic/er/Attribute.java

src/main/java/com/ic/er/ER.java

src/main/java/com/ic/er/Entity.java

src/main/java/com/ic/er/Relationship.java

src/main/java/com/ic/er/Trans.java

src/main/java/com/ic/er/View.java

src/main/java/com/ic/er/common/Cardinality.java

...ain/java/com/ic/er/common/CardinalityEnumTypeHandler.java

src/main/java/com/ic/er/common/RelationshipSerializer.java

src/main/java/com/ic/er/common/ViewDeserializer.java

src/main/java/com/ic/er/entity/AttributeDO.java

src/main/java/com/ic/er/entity/RelationshipDO.java

src/main/resources/mapper/AttributeMapper.xml

src/main/resources/mapper/RelationshipMapper.xml

src/main/resources/mybatis-config.xml

src/main/resources/sql/schema-v1.sql

src/test/java/com/ic/er/TestAttribute.java

src/test/java/com/ic/er/TestER.java

src/test/java/com/ic/er/TestEntity.java

src/test/java/com/ic/er/TestRelationship.java