重点重点重点,不然会报错
连接数据库url后面加个参数
allowMultiQueries=true
用习惯了 insertList 怎么能没有 updateList呢
就两个类 直接上代码
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);
}
我是使用的是Tk.mybatis。代码是复制的原来的updateByPrimaryKeySelective的代码进行的微调
保证最终的结构类似这种就ok
<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>
使用 就和其他的一样 在你的Mapper类上继承这个类ListUpdateByPrimaryKeySelectiveMapper就好了
public interface BaseMapper<T> extends Mapper<T>, MySqlMapper<T>, ListUpdateByPrimaryKeySelectiveMapper<T> {
}
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