MyBatis Plus之实现动态排序方式

 
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
 
/**
 * 1. 基础排序对象，包含排序字段和排序方式
 */
@Data
public class Sorter {
 
    @ApiModelProperty(value = "排序字段", example = "userName")
    private String sort;
 
    @ApiModelProperty(value = "排序方式", example = "asc/desc")
    private String order;
 
    /**
     * 根据查询条件拼接得到order by语句
     *
     * @param sorter 分页查询条件
     * @return String
     */
    public static String getStatement(Sorter sorter) {
        String sort;
        String[] sortArray = {};
        String[] orderArray = {};
        String order = sorter.getOrder();
        String sortColumn = sorter.getSort();
        StringBuilder statement = new StringBuilder();
 
        // 多字段排序
        if (StringUtil.isNotEmpty(sortColumn)) {
            // 驼峰命名转为下划线
            sort = StringUtil.toUnderScoreCase(sortColumn);
 
            if (sort.contains(",")) {
                sortArray = sort.split(",");
            }
        } else {
            return "";
        }
        if (StringUtil.isNotEmpty(order)) {
            if (order.contains(",")) {
                orderArray = order.split(",");
            }
        } else {
            return "";
        }
 
        if (sortArray.length > 0 && orderArray.length > 0) {
            int length = sortArray.length;
 
            for (int i = 0; i < length; i++) {
                statement.append(sortArray[i]);
                statement.append(" ");
                statement.append(orderArray[i]);
 
                if (i < length - 1) {
                    statement.append(", ");
                }
            }
        } else {
            // " #{sort} #{order}“
            statement.append(sort);
            statement.append(" ");
            statement.append(order);
        }
        return statement.toString();
    }
 
    /**
     * 根据查询条件拼接得到order by语句
     *
     * @param sorter 分页查询条件
     * @return String
     */
    public static String getOrderByStatement(Sorter sorter) {
        String statement = getStatement(sorter);
 
        if (StringUtil.isNotEmpty(statement)) {
            return " order by " + statement;
        } else {
            return statement;
        }
    }
}

 
/**
 * 3. 字符串工具类
 * 4.  5. @author lcl
 */
public class StringUtil extends org.apache.commons.lang3.StringUtils {
    /**
     * 下划线
     */
    private static final char SEPARATOR = '_';
 
    /**
     * * 判断一个字符串是否为非空串
     *
     * @param str String
     * @return true：非空串 false：空串
     */
    public static boolean isNotEmpty(String str) {
        return !isEmpty(str);
    }
 
    /**
     * 驼峰转下划线命名
     */
    public static String toUnderScoreCase(String str) {
        if (str == null) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        // 前置字符是否大写
        boolean preCharIsUpperCase = true;
        // 当前字符是否大写
        boolean curreCharIsUpperCase = true;
        // 下一字符是否大写
        boolean nexteCharIsUpperCase = true;
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            if (i > 0) {
                preCharIsUpperCase = Character.isUpperCase(str.charAt(i - 1));
            } else {
                preCharIsUpperCase = false;
            }
 
            curreCharIsUpperCase = Character.isUpperCase(c);
 
            if (i < (str.length() - 1)) {
                nexteCharIsUpperCase = Character.isUpperCase(str.charAt(i + 1));
            }
 
            if (preCharIsUpperCase && curreCharIsUpperCase && !nexteCharIsUpperCase) {
                sb.append(SEPARATOR);
            } else if ((i != 0 && !preCharIsUpperCase) && curreCharIsUpperCase) {
                sb.append(SEPARATOR);
            }
            sb.append(Character.toLowerCase(c));
        }
        return sb.toString();
    }
}

 
@Data
@ApiModel("医生搜索参数对象")
public class SearchDoctorParams extends Sorter{
 
    @ApiModelProperty("搜索关键字")
    private String queryKeyword;
    @ApiModelProperty("科室编号")
    private String departmentNo;
    @ApiModelProperty("医生名称")
    private String doctorName;
    @ApiModelProperty("地区编码")
    private String areaCode;
    @ApiModelProperty("职称编码")
    private String positionCategory;
    @ApiModelProperty("是否有医保编码医生")
    private Boolean withInsuranceCode;
    @ApiModelProperty(value = "三甲名医  1-是 2-否")
    private Integer isFamousDoctor;
    @ApiModelProperty(value = "医生类型(10-全职医生,20-兼职医生)")
    private Integer doctorType;
 
    @ApiModelProperty(value = "医生ids", hidden = true)
    private List<String> doctorIds;
 
 
    @ApiModelProperty(value = "医生特长标签")
    @DisplayDictionary(category = "doctor_specialty_tag")
    private String doctorTag;
 
    String orderStr;
}
 

//给orderStr赋值
record.setOrderStr(Sorter.getOrderByStatement(record));

//xml层使用
<choose>
    <when test="params.orderStr != null and params.orderStr != ''">
        ${orderStr}
    </when>
    <otherwise>
        默认排序
    </otherwise>
</choose>

//QueryWrapper、LambdaQueryWrapper等直接在最后用last
 
 
basicDataService.getList(new LambdaQueryWrapper<>().last(Sorter.getOrderByStatement(record)));