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。我收到以下代码的错误：我希望查询像下面这样工作：

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

下面是我的代码，它在我传递单个值时有效：

        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));

下面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 IN 语法略有不同。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));

查看此问题的答案：IN vs ANY operator in PostgreSQL

如何在 Dapper Query 的动态参数中传递多个条件，就像我们为 IN 运算符传递一样

How to pass multiple condition in dynamic parameter in Dapper Query like we pass for IN operator

database

postgresql

performance

dapper

dynamicparameters