往数据库的表中插入新行

//方法一：用DataAdapter方法，优点：不用写insert语句且不用关心values后边的各字段的形式，如要不要加单引号之类的；缺点:插入一条记录的效率不及写单纯insert语句
    SqlConnection conn = ConnectDB(server, db);
    string sql = "select * from " + tableName;
    SqlDataAdapter da = new SqlDataAdapter(sql, conn);
    SqlCommandBuilder scb = new SqlCommandBuilder(da);//SqlCommandBuilder根据insertCommand构造    updatecommand和deletecommand

    DataTable dt = new DataTable();
    exeTable(conn, dt, sql);
    DataRow dr = dt.NewRow();
    dr.ItemArray = columnValues;
    dt.Rows.Add(dr);

    da.Update(dt);
    conn.Close();
// 方法二：单纯写insert语句插入一条记录，优点:单条数据插入效率高 缺点：需要注意sql语句的构造和sql语句中参数的类型
    string sql = "insert into 表名 values(" + 值1+ "," + 值2+ ",'" + 值3+ "',"+ 值4+ "," + 值5+ "," + 值6+",@参数1,'" + 值7+ "','"+ 值8+ "')";

    SqlParameter param = new System.Data.SqlClient.SqlParameter("@参数1", SqlDbType.Image);
    param.Value = 值9;

    SqlConnection conn = sqlHelper.ConnectDB();
    SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, conn);
    if (param != null) cmd.Parameters.Add(param);
    cmd.ExecuteNonQuery();
    conn.Close();

//方法三:插入大批量数据时用SqlBulkCopy，单条记录插入效率较慢

             DataTable dt = new DataTable();
             dt.Columns.Add("列名1", typeof(string));
             dt.Columns.Add("列名2", typeof(byte[]));
 
             DataRow dr = dt.NewRow();
             dr["列名1"] = 值1;
             dr["列名2"] = 值2;
             dt.Rows.Add(dr);
             dr = dt.NewRow();
             dr["列名1"] = 值3;
             dr["列名2"] = 值4;
             dt.Rows.Add(dr);
             SqlBulkCopy bulk = new System.Data.SqlClient.SqlBulkCopy(conn);
             bulk.DestinationTableName=目标表名;
             bulk.BatchSize=dt.Rows.Count;
             bulk.ColumnMappings.Add("列名1"，目标列名1);
             bulk.ColumnMappings.Add("列名2"，目标列名2);
             bulk.WriteToServer(dt);
             bulk.Close();
             conn.Close();