spring boot之mybatis注解开发（续一）

前文中已经介绍过了mybatis注解开发（详情请看spring boot 之mybatis注解开发），本文将讲述一下高级使用，比如in的使用，批量插入等功能实现

一、@Select @Update @Insert @Delete 注解中批量操作

本文以@Select 和批量@Insert举例

其实很简单，只需要使用<script></script>标签将sql包裹起来，其他书写跟xml一样，可以使用xml中的各种标签

具体实现如下

@Select({
    "<script>" 
    	+ "SELECT "
    	+ "orders.orderId, product_sku.productId, product_sku.skuName, "
    	+ "orders.number, orders.orderPrice,product_sku.skuPrice, "
    	+ "orders.orderCreate, customer.mobile, shop_keeper.mobile1 as shopKeeperMobile, "
    	+ "shop.name, orders.shopId, shop.address, shop.cityCode "
    	+ "FROM orders, product_sku, customer, shop, shop_keeper "
    	+ "WHERE orders.skuId=product_sku.skuId "
    	+ "AND orders.customerId = customer.customerId "
    	+ "<if test='orderStatus != null'>"  
    	+      "AND orders.orderStatus IN "
    	+      "<foreach item='status' index='index' collection='orderStatus' open='(' separator=',' close=')'>"
        +           "#{status} "
        +      "</foreach>"
        + "</if>"
    	+ "AND orders.shopId = shop.shopId "
        + "AND orders.shopId = shop_keeper.shopId "
    	+ "ORDER BY customer.mobile DESC, orders.shopId DESC ,orders.orderCreate DESC"
    + "</script>"
    })
    List<Map<String, Object>> selectOrders(@Param(value="orderStatus")List<Short> orderStatus);

@Insert("<script>" +
            "insert into bsqs_order_product(order_id,product_id,buy_num,create_time," +
            "create_by,update_time,update_by) values " + "" +
            "<foreach item='orderProduct' index='index' collection='orderProducts' open='(' separator=',' close=')'>" +
            "#{orderId},#{productId},#{buyNum},#{buyPrice},#{createTime},#{createBy},#{updateTime},#{updateBy}" +
            "</foreach>" +
            "</script>"
    )
    public void batchInsert1(List<BsqsOrderProduct> orderProducts);

二、使用@SelectProvider  @InsertProvider 等注解开发

具体实现如下：

@InsertProvider 

@InsertProvider(type = BsqsOrderProductProvider.class,method = "batchInsertSql")
public void batchInsert( List<BsqsOrderProduct> orderProducts);

provider实现：

public String batchInsertSql(Map<String,List<BsqsOrderProduct>> map){

        List<BsqsOrderProduct> list = map.get("list");
        StringBuffer pattern = new StringBuffer();
        pattern.append("(#'{'list[{0}].orderId},");
        pattern.append("#'{'list[{0}].productId},");
        pattern.append("#'{'list[{0}].buyNum},");
        pattern.append("#'{'list[{0}].createTime},");
        pattern.append("#'{'list[{0}].createBy},");
        pattern.append("#'{'list[{0}].updateTime},");
        pattern.append("#'{'list[{0}].updateBy})");
        MessageFormat messageFormat = new MessageFormat(pattern.toString());
        StringBuffer sql = new StringBuffer();
        sql.append("insert into bsqs_order_product(order_id,product_id,buy_num,");
        sql.append("create_time,create_by,update_time,update_by) values ");
        int size = list.size();
        for (int i = 0; i < size; i++)
        {
            sql.append(messageFormat.format(new Object[]{i}));
            if (i < size - 1) {
                sql.append(",");
            }
        }
        return sql.toString();
    }

@SelectProvider  

@SelectProvider(type = BsqsCartProvider.class,method = "findCartsSql")
public List<BsqsCart> findCarts(Map<String,Object> map);

provider实现

public String findCartsSql(Map<String,Object> map) {
        List<String> list = (List<String>)map.get("list");
        StringBuffer sql = new StringBuffer();
        sql.append("select id,cart_id as cartId,product_id as productId,");
        sql.append("buy_num as buyNum,uid,add_time as addTime,del_flag as delFlag ");
        sql.append("from bsqs_cart where uid=#{uid} and cart_id in (");
        int size = list.size();
        for (int i = 0; i < size; i++)
        {
            sql.append(String.format("#{list[%s]}",i));
            if (i < size - 1) {
                sql.append(",");
            }
        }
        sql.append(")");
        return sql.toString();
    }