Question

我是VC＃和ADO SQLITE的新手......

我正在尝试根据另一个中的值更改组合框的内容...

我的问题在这里：

SQLiteCommand cmd3 = new SQLiteCommand("select distinct(ACTION) from ACTION_LIST where CATEGORY='comboBox1.text'", conn2);

用什么来做这项工作？这里'comboBox1.text'看作句子而不是变量......

以下是代码：

 private void Form1_Load(object sender, EventArgs e)
        {
            using (SQLiteConnection conn1 = new SQLiteConnection(@"Data Source = Data\MRIS_DB_MASTER"))
            {
                conn1.Open();
                SQLiteCommand cmd2 = new SQLiteCommand("select distinct(CATEGORY) from ACTION_LIST", conn1);
                SQLiteDataAdapter adapter1 = new SQLiteDataAdapter(cmd2);
                DataTable tbl1 = new DataTable();
                adapter1.Fill(tbl1);
                comboBox1.DataSource = tbl1;
                comboBox1.DisplayMember = "CATEGORY";
                adapter1.Dispose();
                cmd2.Dispose();
            }

            using (SQLiteConnection conn2 = new SQLiteConnection(@"Data Source = Data\MRIS_DB_MASTER"))
            {
                conn2.Open();
                SQLiteCommand cmd3 = new SQLiteCommand("select distinct(ACTION) from ACTION_LIST where CATEGORY='comboBox1.text'", conn2);
                SQLiteDataAdapter adapter2 = new SQLiteDataAdapter(cmd3);
                DataTable tbl2 = new DataTable();
                adapter2.Fill(tbl2);
                comboBox2.DataSource = tbl2;
                comboBox2.DisplayMember = "ACTION";
                adapter2.Dispose();
                cmd3.Dispose();
            }
        }

谢谢

问候

Answer 1

使用System.Data.SQLite.SQLiteParameter。试试吧。（我可能有一些语法错误，因为我现在无法对此进行测试......但它应该类似）

从你的代码：

    SQLiteCommand cmd3 = new SQLiteCommand("select distinct(ACTION) from ACTION_LIST where CATEGORY=@category", conn2);
cmd3.Parameters.Add(new SQLiteParameter("@category",comboBox1.Text));

Answer 2

comboBox1.Text是组合框的标签，需要comboBox1.SelectedValue。你还需要做aaron所说的并添加一个参数。

使用组合框值作为查询值（VC＃2k8 / ADO SQLITE）

2 个答案: