[英]System.Data.OleDb.OleDbException: 'Data type mismatch in criteria expression. in c#
[英]System.Data.OleDB 'Data type mismatch in criteria expression.'
我一直在嘗試將不同表(Access 數據庫)中的不同列放入一個 DataTable 中。 查詢/命令正確,但適配器導致錯誤
System.Data.OleDb.OleDbException:“條件表達式中的數據類型不匹配。”
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;
它確實適用於 Access,但 Visual Studio 會在該行引發錯誤:
adapter.Fill(dset, "table");
完整代碼:
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");
我通過在項目上添加數據集文件並“直觀地”完成所有操作來獲得正確的查詢
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)
調用適配器並填充 Datagrid 的代碼是:
DataSet1TableAdapters.DataTable1TableAdapter dadapter = new DataSet1TableAdapters.DataTable1TableAdapter();
DataSet1.DataTable1DataTable dt = new DataSet1.DataTable1DataTable();
dadapter.Fill(dt);
sfDataGrid1.DataSource = dt;
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