Question

我的插入语句如下所示：

<!-- FileName filter for ACE Report download from CSREPORT folder -->
<bean id="aceReportFileNameFilter" class="com.xyz.ACEReportFileNameFilter" />

<bean id="aceReportDownloadStartPolicy"
    class="org.apache.camel.routepolicy.quartz2.CronScheduledRoutePolicy">
    <!-- start every 2min from monday to saturday - TESTING -->
    <property name="routeStartTime" value="0 0/2 * ? * 1-6 *" />
    <!-- Run every 2nd and 23rd of the month at 1AM - PRODUCTION -->
    <!-- <property name="routeStartTime" value="0 0 1 2,23 * ? *" /> -->
</bean>

<routeContext id="aceReportDownload" xmlns="http://camel.apache.org/schema/spring">
    <route autoStartup="false" id="CSReportFtp" routePolicyRef="aceReportDownloadStartPolicy">
        <from id="_from1"
            uri="ftp://user:pwd@host:port/reportFolder?filter=#aceReportFileNameFilter" />
        <log message="Testing ACE report FTP download" />
        <to id="_to1" uri="file://{{downloadFolderPath}}/temp" />
    </route>
</routeContext>

我想把它转换成一个通用的插入函数，我可以将表名，几个列和值作为数组传递给它，函数将构造insert语句并执行它。我确实尝试使用StringBuilder创建它，但我无法成功完成它。任何帮助表示赞赏。谢谢！

Answer 1

这应该这样做。

  public void dbQuery(string tablename, string[] columns, string[] values)
    {
        OleDbConnection conn2 = new OleDbConnection();
        using (OleDbCommand cmd2 = conn2.CreateCommand())
        {
            conn2.Open();
             StringBuilder build = new StringBuilder($"INSERT INTO {tablename} {string.Join(",",columns)}");

            foreach (string paramValue in values)
            {
                int count = 0;
                string paramName = $"@Type0{count.ToString()}";
                build.Append(paramName);
                 cmd2.Parameters.Add(
                 new OleDbParameter(paramName, paramValue.ToString()),
            );

                count++;
            }
            cmd2.CommandText = build.ToString();
            cmd2.ExecuteNonQuery();
            conn2.Close();
        }
    }

自己注意字符串null /空值。

Answer 2

我建议你使用一个自定义类来处理你的列/值管理，就像这样;

public class MyCustomColumn
{
    public string ColumnName {get; set;}
    public object Value {get; set;}
}

这样你就可以传入一个数组;

CreateGenericInsertFunction(string tableName, MyCustomColumn[] columns)

您可以轻松使用KeyValuePair或Tuple，但自定义类在可扩展性方面为您提供了更大的灵活性。

然后你可以做类似的事情;

string colList = "";
string valList = "";
foreach (var col in columns)
{
    if (colList.length == 0)
    {
        colList += ", " + col.ColumnName;
    }
    else
    {
        colList += col.ColumnName;
    }

    // repeat for Value
}
// Finally, join it all together.

动态构造插入语句

2 个答案: