mybatisplus iservice接口下的saveorupdatebatch方法默认是根据主键来决定是要更新还是插入的,如果要根据其他字段(必须是唯一约束,唯一约束字段可以是多个)更新的话,则需要在项目的service层重写该方法。
方法源码
@transactional(
rollbackfor = {exception.class}
)
public boolean saveorupdatebatch(collection<t> entitylist, int batchsize) {
tableinfo tableinfo = tableinfohelper.gettableinfo(this.entityclass);
assert.notnull(tableinfo, "error: can not execute. because can not find cache of tableinfo for entity!", new object[0]);
string keyproperty = tableinfo.getkeyproperty();
assert.notempty(keyproperty, "error: can not execute. because can not find column for id from entity!", new object[0]);
return sqlhelper.saveorupdatebatch(this.entityclass, this.mapperclass, this.log, entitylist, batchsize, (sqlsession, entity) -> {
object idval = reflectionkit.getfieldvalue(entity, keyproperty);
return stringutils.checkvalnull(idval) || collectionutils.isempty(sqlsession.selectlist(this.getsqlstatement(sqlmethod.select_by_id), entity));
}, (sqlsession, entity) -> {
mappermethod.parammap<t> param = new mappermethod.parammap();
param.put("et", entity);
sqlsession.update(this.getsqlstatement(sqlmethod.update_by_id), param);
});
}从源码中可以看出实现saveorupdatebatch的主要方法就是sqlhelper.saveorupdatebatch
public static <e> boolean saveorupdatebatch(class<?> entityclass, class<?> mapper, log log, collection<e> list, int batchsize, bipredicate<sqlsession, e> predicate, biconsumer<sqlsession, e> consumer) {
string sqlstatement = getsqlstatement(mapper, sqlmethod.insert_one);
return executebatch(entityclass, log, list, batchsize, (sqlsession, entity) -> {
if (predicate.test(sqlsession, entity)) {
sqlsession.insert(sqlstatement, entity);
} else {
consumer.accept(sqlsession, entity);
}
});
}该方法的最后两个参数predicate,consumer
predicate 这个函数是用于判断是否要进行插入操作 true插入,false:则通过consumer 函数执行更新
方法改造
注意:写在项目操作对应表的service层
首先在service层定义接口
boolean saveorupdatebatchbyagentidandperiodandtype(list<entity> list);
类为数据库表对应的实体类 ,agentid,period,type,这个三个字段为表的唯一约束,即当表中存在这三个字段组合对应的记录时则进行更新操作,不存在则进行插入操作
service层接口实现
@transactional(rollbackfor = exception.class)
@ds("xxxx")//如果为多数据源,这里要指明具体操作的数据源名称
public boolean saveorupdatebatchbyagentidandperiodandtype(list<entity> list) {
return sqlhelper.saveorupdatebatch(entityclass, this.mapperclass, super.log, list, default_batch_size, (sqlsession, entity) -> {//这里主要是查询唯一约束对应的记录是否存在
lambdaquerywrapper<entity> querywrapper = wrappers.<entity>lambdaquery()
.eq(entity::getagentid, entity.getagentid()).eq(entity::getperiod,entity.getperiod())
.eq(entity::gettype,entity.gettype());
map<string, object> map = collectionutils.newhashmapwithexpectedsize(1);
map.put(constants.wrapper, querywrapper);
return collectionutils.isempty(sqlsession.selectlist(getsqlstatement(sqlmethod.select_list), map));
}, (sqlsession, entity) -> {
lambdaupdatewrapper<entity> lambdaupdatewrapper = new lambdaupdatewrapper<>();
lambdaupdatewrapper.eq(entity::getagentid, entity.getagentid()).eq(entity::getperiod,entity.getperiod())
.eq(entity::gettype,entity.gettype());
map<string, object> param = collectionutils.newhashmapwithexpectedsize(2);
param.put(constants.entity, entity);
param.put(constants.wrapper, lambdaupdatewrapper);
sqlsession.update(getsqlstatement(sqlmethod.update), param);
});
}非批量的saveorupdate也可以按照这种方式进行改造
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