添加查询书籍；BookDO映射文件更新；DOMapper添加@Repository注解；添加自定义业务异常处理；添加Validation验证

bookshelfplus/src/main/java/plus/bookshelf/Common/Error/BusinessErrorCode.java

@@ -0,0 +1,38 @@
+package plus.bookshelf.Common.Error;
+
+public enum BusinessErrorCode implements CommonError {
+    // 通用错误类型 10001
+    PARAMETER_VALIDATION_ERROR(10001, "参数不合法"),
+    UNKNOWN_ERROR(10002, "未知错误"),
+
+    // 20000开头为用户信息相关错误定义
+    USER_NOT_EXIST(20001, "用户不存在"),
+    USER_LOGIN_FAILED(20002, "用户手机号或密码不正确"),
+    USER_NOT_LOGIN(20003, "用户还未登录");
+
+
+    private BusinessErrorCode(int errCode, String errMsg) {
+        this.errCode = errCode;
+        this.errMsg = errMsg;
+    }
+
+    private int errCode;
+    private String errMsg;
+
+    @Override
+    public int getErrCode() {
+        return this.errCode;
+    }
+
+    @Override
+    public String getErrMsg() {
+        return this.errMsg;
+    }
+
+    @Override
+    public CommonError setErrMsg(String errMsg) {
+        this.errCode = errCode;
+        this.errMsg = errMsg;
+        return this;
+    }
+}

bookshelfplus/src/main/java/plus/bookshelf/Common/Error/BusinessException.java

@@ -0,0 +1,37 @@
+package plus.bookshelf.Common.Error;
+
+/**
+ * 包装器业务异常类实现
+ */
+public class BusinessException extends Exception implements CommonError {
+
+    private CommonError commonError;
+
+    public BusinessException(CommonError commonError) {
+        super();
+        this.commonError = commonError;
+    }
+
+    // 接收自定义errMsg的方式构造业务异常
+    public BusinessException(CommonError commonError,String errMsg){
+        super();
+        this.commonError=commonError;
+        this.commonError.setErrMsg(errMsg);
+    }
+
+    @Override
+    public int getErrCode() {
+        return this.commonError.getErrCode();
+    }
+
+    @Override
+    public String getErrMsg() {
+        return this.commonError.getErrMsg();
+    }
+
+    @Override
+    public CommonError setErrMsg(String errMsg) {
+        this.commonError.setErrMsg(errMsg);
+        return this;
+    }
+}

bookshelfplus/src/main/java/plus/bookshelf/Common/Error/CommonError.java

@@ -0,0 +1,7 @@
+package plus.bookshelf.Common.Error;
+
+public interface CommonError {
+    public int getErrCode();
+    public String getErrMsg();
+    public CommonError setErrMsg(String errMsg);
+}