finish attribute & Entity

pom.xml

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/View.java

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

src/main/java/com/ic/er/bean/entity/EntityDO.java

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

src/main/java/com/ic/er/bean/entity/ViewDO.java

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

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

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

src/main/java/com/ic/er/dao/AttributeMapper.java

src/main/resources/mapper/AttributeMapper.xml

src/main/resources/mapper/EntityMapper.xml

src/main/resources/mapper/GraphInfoMapper.xml

src/main/resources/mapper/RelationshipMapper.xml

src/main/resources/mapper/ViewMapper.xml

src/main/resources/mybatis-config.xml