database - 如何在 Dapper Query 的动态参数中传递多个条件，就像我们为 IN 运算符传递的一样

Question

我想在查询我的 PostgreSQL 数据库时传递多个实体代码。我收到以下代码错误：我希望查询如下所示：

        SELECT * FROM public.test WHERE entity_code IN('value1', 'value2');

下面是我的代码，在我传递单个值的情况下有效：

        string query = "SELECT * FROM public.test WHERE entity_code = @Entity_Code";

        Dictionary<string, object> dictionary = new Dictionary<string, object>();
        dictionary.Add("@Entity_Code", "value1");

        var connection = _postgreSqlContext.Database.GetDbConnection();
        var results = connection.Query<Test>(query, new DynamicParameters(dictionary));

以下是在针对同一参数添加多个值的情况下不起作用的代码：

    string query = "SELECT * FROM public.test WHERE entity_code IN @Entity_Code";

    Dictionary<string, object> dictionary = new Dictionary<string, object>();
    dictionary.Add("@Entity_Code", new string[]{ "value1", "value2" });

    var connection = _postgreSqlContext.Database.GetDbConnection();
    var results = connection.Query<Test>(query, new DynamicParameters(dictionary));

Answer 1

Postgres 的 - 语法略有不同IN。你应该使用ANY：

string query = "SELECT * FROM public.test WHERE entity_code = ANY(@Entity_Code)";

var dictionary = new Dictionary<string, object>();
dictionary.Add("@Entity_Code", new string[]{ "value1", "value2" });

var connection = _postgreSqlContext.Database.GetDbConnection();
var results = connection.Query<Test>(query, new DynamicParameters(dictionary));

查看这个问题的答案：IN vs ANY operator in PostgreSQL