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我想编写RightOuterJoin 查询以从 access 数据库中检索数据。如何在c#中实现此查询？我试过这样

connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=Sample1.accdb; Jet OLEDB:Engine Type=5";

string sql = "SELECT t1.mobileno,t1.RetailerNo,t1.custcode,t2.RET NO FROM [C:\\Sample1.accdb].[Table1] as t1 RIGHT OUTER JOIN [C:\\Sample1.accdb].[Table2] as t2 ON t1.RetailerNo = t2.RET NO";


database = new OleDbConnection(connectionString);
database.Open();
OleDbCommand cmd1 = new OleDbCommand(sql, database);
OleDbDataAdapter da = new OleDbDataAdapter(cmd1);

//database.Open();
//conn.Open();
cmd1.ExecuteNonQuery();
System.Data.DataTable dt = new System.Data.DataTable();
da.Fill(dt);
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2 回答 2

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I think you may have a problem with your connection string. It uses the Jet provider, but the database type is the newer ACCDB format. Jet does not work with ACCDB.

For ACCDB, you need the ACE provider. If you don't have Office 2007 or 2010 installed, you can download and install the Access Database Engine Redistributable.

Here is the provider section from a working connection string:

Provider=Microsoft.ACE.OLEDB.12.0

See Connection strings for Access 2007 for more details.

Once you have a working connection to Sample1.accdb, revise your SQL statement to this:

SELECT t1.mobileno,t1.RetailerNo,t1.custcode,t2.[RET NO]
FROM 
    Table1 as t1
    RIGHT JOIN Table2 as t2
    ON t1.RetailerNo = t2.[RET NO]

Notes:

  1. Since you're already connected to Sample1.accdb, you don't need to prefix the table names with the path to the db file.
  2. For a field name which includes a space (RET NO), enclose the field name in square brackets.
于 2012-07-23T06:01:13.317 回答
0

试试下面的代码

select * from tblemp right join tblDept on tblemp.DeptId=tblDept.pkDeptId

它与您在 SQL SERVER 中使用右连接相同。

于 2012-07-23T05:29:24.637 回答