result code and connect DB static method

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

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

src/main/java/com/ic/er/service/ViewService.java

src/main/java/com/ic/er/util/boot.java

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

target/classes/com/ic/er/bean/entity/Attribute.class

target/classes/com/ic/er/bean/entity/Entity.class

target/classes/com/ic/er/bean/entity/Relationship.class

target/classes/com/ic/er/bean/entity/View.class

target/classes/mapper/RelationshipMapper.xml