C# & SQL Server：搜索所有数据库列并填充数据网格

Question

我正在编写一个 C# 应用程序，但我一直在搜索数据库和填充数据网格视图。但是我想将它与命令生成器一起使用。

问题是，我需要对数据库中的所有列进行搜索。我认为使用 OR 和 LIKE 语句可以做到这一点。但相反，我得到无效的语法或搜索中不存在列名。

有人知道解决办法吗？

我现在的.cs：

private void btnSearchJob_Click(object sender, EventArgs e)
{
    try
    {
        SqlConnection con = new SqlConnection();
        con.ConnectionString = (@"Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=MTR_Database;Integrated Security=True");

        string selectQuery = "SELECT * FROM dbo.[" + cmbJobName.Text + "] WHERE ([Job Name] LIKE " +txtSearchJob.Text+ " OR [Manufacturer] LIKE " +txtSearchJob.Text+ ")";

        // DataAdapter
        myDA = new SqlDataAdapter(selectQuery, con);

        // SqlCommand
        SqlCommand myCMD = new SqlCommand(selectQuery, con);

        // DataAdapter to Command
        myDA.SelectCommand = myCMD;

        // Define Datatable
        myDT = new DataTable();

        // Command Builder (IS GOD!)
        SqlCommandBuilder cb = new SqlCommandBuilder(myDA);

        // Teach Command builder to be a boss!
        myDA.UpdateCommand = cb.GetUpdateCommand();
        myDA.InsertCommand = cb.GetInsertCommand();
        myDA.DeleteCommand = cb.GetDeleteCommand();

        // Fill the DataTable with DataAdapter information
        myDA.Fill(myDT);

        // Fill DataTable with Database Schema
        myDA.FillSchema(myDT, SchemaType.Source);

        // Bind The Data Table to the DataGrid
        dataGridView1.DataSource = myDT;

        // AutoSize Datagrid Rows and Colums to fit the Datagrid
        dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
        dataGridView1.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;
    }
    // Catch Exception
    catch (Exception ex)
    {
        MessageBox.Show(this, ex.Message, "SQL ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

注意：

我知道使用参数，我只是用它来看看它是否会在我稍后添加参数时起作用。

Answer 1

这是我用来将所有内容恢复到 DataTable 中的方法

 //'places the call to the system and returns the data as a datatable
    public  DataTable GetDataAsDatatable(List<SqlParameter> sqlParameters, string connStr, string storedProcName)
    {

        var dt = new DataTable();
        var sqlCmd = new SqlCommand();
        using (var sqlconn = new SqlConnection(connStr))
        {
            sqlCmd.Connection = sqlconn;
            sqlCmd.CommandType = CommandType.StoredProcedure;
            sqlCmd.CommandText = storedProcName;
            sqlCmd.CommandTimeout = 5000;
            foreach (var sqlParam in sqlParameters)
            {
                sqlCmd.Parameters.Add(sqlParam);
            }
            using (var sqlDa = new SqlDataAdapter(sqlCmd))
            {
                sqlDa.Fill(dt);
            }
        }

        sqlParameters.Clear();
        return dt;
    }

    //'places the call to the system and returns the data as a datatable
    public  DataTable GetDataAsDatatable(string connStr, string query)
    {

        var dt = new DataTable();
        var sqlCmd = new SqlCommand();
        using (var sqlconn = new SqlConnection(connStr))
        {
            sqlCmd.Connection = sqlconn;
            sqlCmd.CommandType = CommandType.Text;
            sqlCmd.CommandText = query;
            sqlCmd.CommandTimeout = 5000;
            using (var sqlDa = new SqlDataAdapter(sqlCmd))
            {
                sqlDa.Fill(dt);
            }
        }

        return dt;
    }

希望这对你来说是非常自我解释的，但是传入一个 SQL 参数列表、连接字符串和存储过程名称，或者使用你传入内联 SQL 和连接字符串的第二个。

Answer 2

我认为您在查询中缺少 '。试试这个...

string selectQuery = "SELECT * FROM dbo.[" + cmbJobName.Text + "] WHERE ([Job Name] LIKE '" +txtSearchJob.Text+ "' OR [Manufacturer] LIKE '" +txtSearchJob.Text+ "')";