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mybatis-plus @select動態(tài)查詢方式

更新時間：2024年05月10日 09:57:17 作者：仔仔程

這篇文章主要介紹了mybatis-plus @select動態(tài)查詢方式,具有很好的參考價值,希望對大家有所幫助,如有錯誤或未考慮完全的地方,望不吝賜教

mybatis-plus @select 動態(tài)查詢

@Select({"<script> select cor.risk_id,cor.create_by as leader,cor.create_time as put_forward_time," +
            "cor.correct_user_name as handle,cor.update_time as handle_time," +
            "cor.correct_end_time,cor.correct_status,risk.risk_name,rt.risk_name as risk_type,pro.pro_code," +
            "pro.pro_name,pro.pro_leader_name as pro_leader,pt.type_name as pro_type from data_risk_correct cor " +
            "left join data_project_risk risk on cor.risk_id=risk.risk_id " +
            "left join data_risk_type rt on risk.risk_type_id=rt.risk_id " +
            "left join data_project pro on risk.pro_id=pro.pro_id " +
            "left join data_project_type pt on pro.pro_type_id=pt.type_id " +
            "<where>"+
            "<if test='riskCenterVo.riskName != null and riskCenterVo.riskName !=\"\"'>" +
            " and risk.risk_name like concat('%',#{riskCenterVo.riskName},'%')  " +
            "</if>" +
            "<if test='riskCenterVo.proName != null and riskCenterVo.proName !=\"\"'>" +
            " and pro.pro_name like concat('%',#{riskCenterVo.proName},'%')  " +
            "</if>" +
            "<if test='riskCenterVo.proCode != null and riskCenterVo.proCode !=\"\"'>" +
            " and pro.pro_code =#{riskCenterVo.proCode} " +
            "</if>" +
            "<if test='riskCenterVo.correctStatus != null '>" +
            " and cor.correct_status=#{riskCenterVo.correctStatus} " +
            "</if>" +
            "</where>" +
            "and cor.is_delete=0 and cor.correct_user_id=#{userId}" +
            "</script>"})
    List<RiskCenterVo> selectRiskCenterList(@Param("riskCenterVo") RiskCenterVo riskCenterVo,@Param("userId") String userId);

SpringBoot+MyBatis動態(tài)查詢支持的通用方法

這幾天研究使用了一下 springBoot + MyBatis動態(tài)注解.

看了好多人說myBatis不支持動態(tài),其實(shí)不然, 我個人不喜歡太多配置, 所以一慣喜歡使用注解模式, 但spring體系當(dāng)中注解實(shí)在太多了, 其實(shí)常用的也就那么幾個.

呵呵又跑題了.回來

package cn.miw.rpc.batis.comm;
 
import java.util.List;
 
import org.apache.ibatis.annotations.DeleteProvider;
import org.apache.ibatis.annotations.InsertProvider;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.SelectProvider;
import org.apache.ibatis.annotations.UpdateProvider;
 
/**
 * 通用Mapper基礎(chǔ)接口,使用范型,其他Mapper繼承即可
 * @author mrzhou
 *
 * @param <T>
 */
public interface GeneralMapper<T> {
	@InsertProvider(method="insert",type=SQLGen.class)
	@Options(useGeneratedKeys=true,keyProperty="id")
	int save(T t);
	
	@DeleteProvider(method="del",type=SQLGen.class)
	int del(T t);
	
	@UpdateProvider(method="update",type=SQLGen.class)
	int update(T t);
	
	@SelectProvider(method="select",type=SQLGen.class)
	List<T> list(T t);
	
}

我個常用的也就是CRUD這4個方法, 其他的Mapper方法你可以在繼承中再繼續(xù)寫吧, 那些就是大家常用的可以寫在繼承接口當(dāng)中.

這里我寫了一個通用的SQLProvider類SQLGen.java

package cn.miw.rpc.batis.comm;
 
import java.lang.reflect.Field;
 
import org.apache.ibatis.jdbc.SQL;
/**
 * 常規(guī)CRUD四個方法
 * @author mrzhou
 *
 * @param <T>
 */
public class SQLGen<T> {
	public String select(T object) {
		return new SQL() {
			{
				SELECT("*");
				FROM(object.getClass().getSimpleName());
				try {
					Field[] fields = object.getClass().getDeclaredFields();
					for (Field field : fields) {
						field.setAccessible(true);
						Object v = field.get(object);
						if (v != null) {
							String fieldName = field.getName();
							if (v instanceof String && ((String)v).contains("%")) {
								WHERE(fieldName + " like '"+v+"'" );
							} else {
								WHERE(fieldName + "=#{" + fieldName + "}");
							}
							
						}
					}
				} catch (Exception e) {
				}
 
			}
		}.toString();
	}
	public String update(T object) {
		return new SQL() {
			{
				UPDATE(object.getClass().getSimpleName());
				try {
					Field[] fields = object.getClass().getDeclaredFields();
					for (Field field : fields) {
						field.setAccessible(true);
						Object v = field.get(object);
						if (v != null) {
							String fieldName = field.getName();
							SET(fieldName + "=#{" + fieldName + "}");
						}
					}
				} catch (Exception e) {
				}
				WHERE("id=#{id}");
			}
		}.toString();
	}
	public String insert(T object) {
		return new SQL() {
			{
				INSERT_INTO(object.getClass().getSimpleName());
				try {
					Field[] fields = object.getClass().getDeclaredFields();
					for (Field field : fields) {
						field.setAccessible(true);
						Object v = field.get(object);
						if (v != null) {
							String fieldName = field.getName();
							VALUES(fieldName,"#{"+fieldName+"}");
						}
					}
				} catch (Exception e) {
				}
			}
		}.toString();
	}
	public String del(T object) {
		return new SQL() {
			{
				DELETE_FROM(object.getClass().getSimpleName());
				try {
					Field[] fields = object.getClass().getDeclaredFields();
					for (Field field : fields) {
						field.setAccessible(true);
						Object v = field.get(object);
						if (v != null) {
							String fieldName = field.getName();
							if (v instanceof String && ((String)v).contains("%")) {
								WHERE(fieldName + " like '"+v+"'" );
							} else {
								WHERE(fieldName + "=#{" + fieldName + "}");
							}
						}
					}
				} catch (Exception e) {
				}
			}
		}.toString();
	}
}

在調(diào)用Mapper方法時傳入相應(yīng)的實(shí)體, 如果字段類型為String且包含%, 將使用like 進(jìn)行查詢, 該操作僅對select和delete操作有效. insert,update則不受此限制, '%'百分號將作為內(nèi)容被保存進(jìn)數(shù)據(jù)庫

在對應(yīng)的Service中我們只需要這樣使用

User user = new User();
user.setName("張%");// 或者user.setName("%趙%");
List<User> list = userMapper.list(user);

是不是很方便呢?

當(dāng)然你的其他方法可以繼續(xù)在相應(yīng)的Mapper中繼續(xù)描述

package cn.miw.rpc.batis.mapper;
 
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
 
import cn.miw.rpc.batis.comm.GeneralMapper;
import cn.miw.rpc.model.User;
/**
 * 用戶Mapper,定義其他常規(guī)的方便方法
 * @author mrzhou
 *
 */
@Mapper
public interface UserMapper extends GeneralMapper<User> {
 
	@Insert("insert into User(name,age) values(#{name},#{age})")
	int addUser(@Param("name") String name, @Param("age") int age);
 
	@Select("select * from User where id =#{id}")
	User findById(@Param("id") int id);
	
	@Update("update User set name=#{name} where id=#{id}")
	void updataById(@Param("id") int id, @Param("name") String name);
 
	@Delete("delete from User where id=#{id}")
	void deleteById(@Param("id") int id);
}

各位看包名, 其實(shí)我這個假期是在研究一些rpc的東西, 順帶折騰了一下mybatis.