code: private InnerEnum generatedIncEnum(IntrospectedTable introspectedTable) {
          // 增加枚举
          InnerEnum eIncrements = new InnerEnum(new FullyQualifiedJavaType("Inc"));
          eIncrements.setVisibility(JavaVisibility.PUBLIC);
          eIncrements.setStatic(true);
          eIncrements.addEnumConstant("INC(\"+\")");
          eIncrements.addEnumConstant("DEC(\"-\")");
          commentGenerator.addEnumComment(eIncrements, introspectedTable);
          // 生成属性和构造函数
          Field fValue = new Field("value", FullyQualifiedJavaType.getStringInstance());
          fValue.setVisibility(JavaVisibility.PRIVATE);
          fValue.setFinal(true);
          commentGenerator.addFieldComment(fValue, introspectedTable);
          eIncrements.addField(fValue);
  
          Method mInc = new Method("Inc");
          mInc.setConstructor(true);
          mInc.addBodyLine("this.value = value;");
          mInc.addParameter(new Parameter(FullyQualifiedJavaType.getStringInstance(), "value"));
          commentGenerator.addGeneralMethodComment(mInc, introspectedTable);
          FormatTools.addMethodWithBestPosition(eIncrements, mInc);
  
          Method mValue = JavaElementGeneratorTools.generateGetterMethod(fValue);
          commentGenerator.addGeneralMethodComment(mValue, introspectedTable);
          FormatTools.addMethodWithBestPosition(eIncrements, mValue);
  
          return eIncrements;
      }
docs: 生成Inc enum
  @param introspectedTable
  @return