Question

假设我们有HQL查询：

String ageQuery = "select age from people where name = :name";

Session session = getSession();
Query query = session.
        createSQLQuery(nameQuery).
        setParameter("name", "Thomas");
// query.list(); returns the result

但是，如果我想参数化表名怎么办？人们不能这样使用它：

String ageQuery = "select :table from people where name = :name";

Session session = getSession();
Query query = session.
        createSQLQuery(ageQuery).
        setParameter("table", "age").
        setParameter("name", "Thomas");

我已应用解决方法：

String ageQuery = "select :table: from people where name = :name";

Session session = getSession();
Query query = session.
        createSQLQuery(ageQuery.
        replace(":table:", "age")).
        setParameter("name", "Thomas");

......但我真的不喜欢它。还有其他解决方案吗？

Answer 1

您无法将表名定义为参数;你必须以旧的方式用字符串连接来构建语句您的解决方法不是解决方法，而是继续进行的唯一方法问题类似于Incorrect syntax near '@P0'. exception when create and drop Login in MSSQL

中描述的问题

Answer 2

我在下面使用动态查询：

var query = session.CreateQuery(String.Format("update {0} set {1} = :updatevalue where {2} = :wherevalue",
    MyClassMapping<UserEntity>.GetEntityName(),
    MyClassMapping<UserEntity>.GetPropertyName(x => x.LastLoginTime),
    MyClassMapping<UserEntity>.GetPropertyName(x => x.UserKey)))
    .SetParameter("updatevalue", DateTime.Now)
    .SetParameter("wherevalue", user.UserKey);
int rowsAffected = query.ExecuteUpdate();

表名作为HQL中的参数

2 个答案: