Java Mybatis批量修改封装详解

package com.lancabbage.gorgeous.utils.mybatis;
import org.apache.ibatis.mapping.MappedStatement;
import tk.mybatis.mapper.entity.EntityColumn;
import tk.mybatis.mapper.mapperhelper.EntityHelper;
import tk.mybatis.mapper.mapperhelper.MapperHelper;
import tk.mybatis.mapper.mapperhelper.MapperTemplate;
import tk.mybatis.mapper.mapperhelper.SqlHelper;
import java.util.Set;
import static tk.mybatis.mapper.mapperhelper.SqlHelper.whereVersion;
/**
 * ListUpdateProvider实现类，批量修改方法实现类
 *
 * @author lanyanhua
 */
public class ListUpdateProvider extends MapperTemplate {
    public ListUpdateProvider(Class<?> mapperClass, MapperHelper mapperHelper) {
        super(mapperClass, mapperHelper);
    }
//    /**
//     * 通过主键更新全部字段
//     *
//     * @param ms
//     */
//    public String updateByPrimaryKey(MappedStatement ms) {
//        Class<?> entityClass = getEntityClass(ms);
//        StringBuilder sql = new StringBuilder();
//        sql.append(SqlHelper.updateTable(entityClass, tableName(entityClass)));
//        sql.append(SqlHelper.updateSetColumns(entityClass, null, false, false));
//        sql.append(SqlHelper.wherePKColumns(entityClass, true));
//        return sql.toString();
//    }
    /**
     * 通过主键更新不为null的字段
     *
     * @param ms
     * @return
     */
    public String updateByPrimaryKeySelectiveList(MappedStatement ms) {
        Class<?> entityClass = getEntityClass(ms);
        StringBuilder sql = new StringBuilder();
        sql.append("<foreach collection=\"list\" item=\"record\" >");
        //set
        sql.append(SqlHelper.updateTable(entityClass, tableName(entityClass)));
        sql.append(SqlHelper.updateSetColumns(entityClass, "record", true, isNotEmpty()));
        //where
        sql.append("<where>");
        Set<EntityColumn> columnSet = EntityHelper.getPKColumns(entityClass);
        //当某个列有主键策略时，不需要考虑他的属性是否为空，因为如果为空，一定会根据主键策略给他生成一个值
        for (EntityColumn column : columnSet) {
            sql.append(" AND ").append(column.getColumnEqualsHolder("record"));
        }
        sql.append(whereVersion(entityClass));
        sql.append("</where>");
        sql.append(" ;\n");
        sql.append("</foreach>");
        return sql.toString();
    }
}

package com.lancabbage.gorgeous.utils.mybatis;
import org.apache.ibatis.annotations.UpdateProvider;
import tk.mybatis.mapper.annotation.RegisterMapper;
import java.util.List;
/**
 * 通用Mapper接口,更新
 *
 * @param <T> 不能为空
 * @author lanyanhua
 */
@RegisterMapper
public interface ListUpdateByPrimaryKeySelectiveMapper<T> {
    /**
     * 根据主键更新属性不为null的值
     *
     * @param record
     * @return
     */
    @UpdateProvider(type = ListUpdateProvider.class, method = "dynamicSQL")
    int updateByPrimaryKeySelectiveList(List<T> record);
}

<foreach collection="list" item="record" separator=";">
  UPDATE project 
    <set>id = id,
      <if test="record.name != null">name = #{record.name},</if>
      <if test="record.remotePath != null">remote_path = #{record.remotePath},</if>
      <if test="record.createTime != null">create_time = #{record.createTime},</if>
      <if test="record.isShow != null">is_show = #{record.isShow},</if>
      <if test="record.displayOrder != null">display_order = #{record.displayOrder},</if>
    </set>
    <where>AND id = #{record.id}</where>
</foreach>

public interface BaseMapper<T> extends Mapper<T>, MySqlMapper<T>, ListUpdateByPrimaryKeySelectiveMapper<T> {
}