如何在C＃中以字符串形式返回查询结果？

Question

下面的查询返回一个VARCHAR值，我想将此值作为字符串返回。我该怎么办？

代码段：

// src/main/kotlin/domain/Plan.kt

@Entity
@Table(name = "provider")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
data class Provider(
    // [...]

    @OneToMany(mappedBy = "provider")
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    var plans: MutableSet<Plan> = mutableSetOf(),

    @OneToMany(mappedBy = "provider")
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    var perDayPricings: MutableSet<PerDayPricing> = mutableSetOf(),

    @OneToMany(mappedBy = "provider")
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    var fixedDurationPricings: MutableSet<FixedDurationPricing> = mutableSetOf()

    // jhipster-needle-entity-add-field - JHipster will add fields here, do not remove
) : Serializable

Answer 1

您可以创建一个列表并将值添加到列表中。返回列表后。

Answer 2

如何以字符串形式返回VARCHAR查询结果：

while (reader.Read())
{
        results= reader.GetString(0);                          // Added this
}
return results;