有没有办法传递动态列名?
我们可以使用 ## 传递值
价值#
其中#columnName# = #value#
不适合我
这是我通过从 IBatis 生成动态查询的解决方案:。
查询的配置对象:
[Serializable]
public partial class QueryHelper
{
private string _queryFields;
public string query_fields
{
get { return _queryFields; }
set { _queryFields = value; }
}
private string _queryFrom;
public string query_from
{
get { return _queryFrom; }
set { _queryFrom = value; }
}
private string _queryFilterDefa;
public string query_filter_defa
{
get { return _queryFilterDefa; }
set { _queryFilterDefa = value; }
}
private string _queryFilterId;
public string query_filter_id
{
get { return _queryFilterId; }
set { _queryFilterId = value; }
}
private string _queryJoins;
public string query_joins
{
get { return _queryJoins; }
set { _queryJoins = value; }
}
private string _queryFilter;
public string query_filter
{
get { return _queryFilter; }
set { _queryFilter = value; }
}
private string _queryOrder;
public string query_order
{
get { return _queryOrder; }
set { _queryOrder = value; }
}
}
XML
<?xml version="1.0" encoding="utf-8" ?>
<sqlMap namespace="QueryHelper"
xmlns="http://ibatis.apache.org/mapping"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<alias>
<typeAlias alias="QueryHelper" type="Core.CustomEntities.QueryHelper" />
</alias>
<statements>
<select id="ExecuteQuery" parameterClass="QueryHelper" resultClass="HashTable">
SELECT $query_fields$
FROM $query_from$
<isNotEmpty property="query_joins" >
$query_joins$
</isNotEmpty>
WHERE $query_filter_defa$
<isNotEmpty prepend="AND" property="query_filter_id" >
$query_filter_id$
</isNotEmpty>
<isNotEmpty prepend="AND" property="query_filter" >
$query_filter$
</isNotEmpty>
<isNotEmpty prepend="ORDER BY" property="query_order" >
$query_order$
</isNotEmpty>
</select>
</statements>
</sqlMap>
您可以为整个 WHERE 子句构建一个字符串,将其放入您的参数对象中,然后在您的 iBATIS XML 中引用它,如下所示:
select *
from blah
where ?whereClause?
这 '?' 在参数的末尾告诉 iBATIS 按原样使用其内容。这可能会打开潜在风险(SQL 注入等)的大门,因此请务必在继续使用此方法之前彻底检查您的参数。