System.Data.OleDB 'Data type mismatch in criteria expression.'

Question

我一直在尝试将不同表（Access 数据库）中的不同列放入一个数据表中。查询/命令正确，但适配器导致错误

System.Data.OleDb.OleDbException:'Data type mismatch in criteria expression.'

命令是

SELECT tab_agend.ID, tab_teams.Descricao, tab_agend.idtask 
FROM tab_teams 
INNER JOIN tab_agend ON tab_teams.ID = tab_agend.idequipa;

它确实适用于 Access，但 Visual Studio 会在以下行引发错误：

adapter.Fill(dset, "table");

完整代码：

string query;

if (Tabela == "tab_agend") 
{  
    query = "SELECT tab_agend.ID, tab_teams.Descricao, tab_agend.idtask " + 
            " FROM tab_teams " + 
            " INNER JOIN tab_agend ON tab_teams.ID = tab_agend.idequipa;";
} 
else 
{  
     query = "SELECT * FROM " + Tabela;
}

dset.Reset();

adapter = new OleDbDataAdapter(query, connection);
adapter.Fill(dset, "table");

Answer 1

我通过在项目上添加数据集文件并“可视化”完成所有操作得到了正确的查询

Image of DataSet1.xsd (DataSet File)

SELECT 
    tab_places.Localizacao, 
    tab_subtasks.[Desc], tab_subtasks.Type, 
    tab_tasks.*, tab_subtasks.IDTask
FROM 
    ((tab_tasks 
LEFT JOIN 
    tab_places ON tab_tasks.IDPlace = tab_places.ID) 
LEFT JOIN 
    tab_subtasks ON tab_tasks.ID = tab_subtasks.IDTask)

调用适配器并填充数据网格的代码是：

DataSet1TableAdapters.DataTable1TableAdapter dadapter = new DataSet1TableAdapters.DataTable1TableAdapter();

DataSet1.DataTable1DataTable dt = new DataSet1.DataTable1DataTable();

dadapter.Fill(dt);

sfDataGrid1.DataSource = dt;

System.Data.OleDB 'Data type mismatch in criteria expression.'

System.Data.OleDB 'Data type mismatch in criteria expression.'

c#

sql

ms-access

winforms