因为没有创建连接
var select = ctx
.select(PRODUCT.NAME, PRODUCT.CODE, BRAND.NAME.as("brandName"), CATEGORY.NAME.as("categoryName"))
.from(PRODUCT)
.leftJoin(BRAND).on(PRODUCT.BRAND_ID.eq(BRAND.ID))
.leftJoin(CATEGORY).on(PRODUCT.CATEGORY_ID.eq(CATEGORY.ID))
.where(condition);
原文:https://www.cnblogs.com/king0207/p/13373633.html