Question

我有一个TreeView控件（看起来应该是这样的）

alt text

但我不知道如何用我的查询填充它：

SELECT T.TableName, C.Column_Name FROM Information_Schema.Tables T
INNER JOIN Information_Schema.Columns C
 ON T.TableName= C.TableName
WHERE T.TableName IN('BASE_TABLE', 'BASE TABLE')
ORDER BY 1, C.Ordinal_Position

任何人都可以帮助我......

感谢。

修改这是我试过的，但只是表名......

private void PopulateTreeView()
{
    SqlCeCommand cmd = new SqlCeCommand();
    try
    {
        using (SqlCeConnection conn = new SqlCeConnection("Data Source=" + connString))
        {            
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES";
            conn.Open();
            cmd.Connection = conn;
            cmd.ExecuteNonQuery();
            // Don't know what's next...
        }
    }
    catch (Exception x)
    {
        MessageBox.Show(x.GetBaseException().ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
    finally
    {
        cmd.Dispose();
    }
}

Answer 1

这是一个非LINQ的答案，它做了类似的事情：

using (var conn = new SqlCeConnection(connectionString))
using (var cmd = conn.CreateCommand())
{
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = @"
SELECT T.TABLE_NAME, C.COLUMN_NAME
FROM INFORMATION_SCHEMA.TABLES T
INNER JOIN INFORMATION_SCHEMA.COLUMNS C
ON T.TABLE_NAME= C.TABLE_NAME
WHERE T.TABLE_NAME IN('BASE_TABLE', 'BASE TABLE')
ORDER BY 1, C.ORDINAL_POSITION";
    conn.Open();
    cmd.Connection = conn;
    using (var reader = cmd.ExecuteReader())
    {
        string lastTable = null;
        TreeNode tableNode = null;
        while (reader.Read()) { 
            if (lastTable != reader.GetString(0)) {
                lastTable = reader.GetString(0);
                tableNode = new TreeNode(lastTable);
                myTree.Nodes.Add(tableNode);
            }
            tableNode.ChildNodes.Add(new TreeNode(reader.GetString(1)));
        }
    }
}

Answer 2

顺便说一下，永远不要在服务器上使用MessageBox; p

使用LINQ-to-SQL 的核心查询类似于：

using (var ctx = new DataClasses1DataContext()) { string[] names = {"BASE_TABLE", "BASE TABLE"}; var qry = (from table in ctx.Tables where names.Contains(table.TableName) join column in ctx.Columns on table.TableName equals column.TableName orderby table.TableName, column.ColumnName select new { table.TableName, column.ColumnName }).ToList(); foreach (var pair in qry.GroupBy(pair => pair.TableName)) { TreeNode tableNode = new TreeNode(pair.Key); myTree.Nodes.Add(tableNode); foreach (var col in pair) { tableNode.ChildNodes.Add(new TreeNode(col.ColumnName)); } } }

假设一个手工制作的 DBML（因为设计师过滤了这些表格），大致如下：

<?xml version="1.0" encoding="utf-8"?><Database Name="YourDatabase" Class="DataClasses1DataContext" xmlns="http://schemas.microsoft.com/linqtosql/dbml/2007"> <Connection Mode="WebSettings" ConnectionString="YourConnectionString" SettingsObjectName="System.Configuration.ConfigurationManager.ConnectionStrings" SettingsPropertyName="YourConnectionStringPropertyName" Provider="System.Data.SqlClient" /> <Table Name="INFORMATION_SCHEMA.TABLES" Member="Tables"> <Type Name="Table"> <Column Name="TABLE_NAME" Member="TableName" Type="System.String" DbType="nvarchar(128) NOT NULL" CanBeNull="false" /> </Type> </Table> <Table Name="INFORMATION_SCHEMA.COLUMNS" Member="Columns"> <Type Name="Column"> <Column Name="TABLE_NAME" Member="TableName" Type="System.String" DbType="nvarchar(128) NOT NULL" CanBeNull="false" /> <Column Name="COLUMN_NAME" Member="ColumnName" Type="System.String" DbType="nvarchar(128) NOT NULL" CanBeNull="false" /> <Column Name="ORDINAL_POSITION" Member="OrdinalPosition" Type="System.Int32" DbType="int NOT NULL" CanBeNull="false" /> </Type> </Table> </Database>

Answer 3

这是可行的答案。我刚刚从格拉维尔爵士的代码中编辑了一些代码

private void PopulateTreeView()
{
    treeView1.Nodes.Clear();

    using (var conn = new SqlCeConnection("Data Source=" + connString))
    using (var cmd = conn.CreateCommand())
    {
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = @"SELECT T.TABLE_NAME, C.COLUMN_NAME
                            FROM INFORMATION_SCHEMA.TABLES AS T INNER JOIN
                            Information_Schema.Columns AS C ON T.TABLE_NAME = C.TABLE_NAME
                            WHERE T.TABLE_TYPE IN('BASE_TABLE', 'BASE TABLE', 'TABLE')
                            ORDER BY T.TABLE_NAME, C.ORDINAL_POSITION";
        conn.Open();
        cmd.Connection = conn;

        using (var reader = cmd.ExecuteReader())
        {
            string lastTable = null;
            TreeNode tableNode = null;
            while (reader.Read())
            {
                if (lastTable != reader.GetString(0))
                {
                    lastTable = reader.GetString(0);
                    tableNode = new TreeNode(lastTable);
                    treeView1.Nodes.Add(tableNode);
                }
                tableNode.Nodes.Add(new TreeNode(reader.GetString(1)));
            }
        }
    }
}

如何使用层次结构级别填充TreeView控件？

3 个答案: