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有没有一种“不错”的方式来为 SharePoint 创建一个 CAML 查询来做这样的事情?
SELECT *
FROM table
WHERE Id IN (3, 12, ...)
<Or>
节点?
<Or>
的解决方案节点。
/// Simulates a SQL 'Where In' clause in CAML
/// </summary>
/// <param name="columnType">Specifies the data type for the value contained by the field.</param>
/// <returns>Nested 'Or' elements portion of CAML query</returns>
public static string CamlIn<T>(string internalFieldName, string columnType, T[] values)
{
XDocument doc = new XDocument();
XElement prev = null;
int index = 0;
while (index < values.Length)
{
XElement element =
new XElement("Or",
new XElement("Eq",
new XElement("FieldRef",
new XAttribute("Name", internalFieldName)),
new XElement("Value",
new XAttribute("Type", columnType),
values[index++].ToString())));
if (index == values.Length - 1)
{
element.AddFirst(
new XElement("Eq",
new XElement("FieldRef",
new XAttribute("Name", internalFieldName)),
new XElement("Value",
new XAttribute("Type", columnType),
values[index++].ToString())));
}
if (prev != null)
prev.AddFirst(element);
else
doc.Add(element);
prev = element;
}
return doc.ToString(SaveOptions.DisableFormatting);
}
int[] ids = new int[] { 1, 2, 4, 5 };
string query = string.Format("<Where>{0}</Where>", CamlIn("SomeColumn", "Number", ids));
<Where>
<Or>
<Or>
<Or>
<Eq>
<FieldRef Name=\"SomeColumn\" />
<Value Type=\"Number\">5</Value>
</Eq>
<Eq>
<FieldRef Name=\"SomeColumn\" />
<Value Type=\"Number\">4</Value>
</Eq>
</Or>
<Eq>
<FieldRef Name=\"SomeColumn\" />
<Value Type=\"Number\">2</Value>
</Eq>
</Or>
<Eq>
<FieldRef Name=\"SomeColumn\" />
<Value Type=\"Number\">1</Value>
</Eq>
</Or>
</Where>
/// <summary>
/// Simulates a SQL 'Where In' clause in CAML
/// </summary>
/// <param name="lookupId">Specify whether to use the Lookup column's Id or Value.</param>
/// <returns>Nested 'Or' elements portion of CAML query</returns>
public static string CamlIn<T>(string internalFieldName, bool lookupId, T[] values)
{
XDocument doc = new XDocument();
XElement prev = null;
int index = 0;
while (index < values.Length)
{
XElement element =
new XElement("Or",
new XElement("Eq",
new XElement("FieldRef",
new XAttribute("Name", internalFieldName),
lookupId ? new XAttribute("LookupId", "TRUE") : null),
new XElement("Value",
new XAttribute("Type", "Lookup"),
values[index++].ToString())));
if (index == values.Length - 1)
{
element.AddFirst(
new XElement("Eq",
new XElement("FieldRef",
new XAttribute("Name", internalFieldName),
lookupId ? new XAttribute("LookupId", "TRUE") : null),
new XElement("Value",
new XAttribute("Type", "Lookup"),
values[index++].ToString())));
}
if (prev != null)
prev.AddFirst(element);
else
doc.Add(element);
prev = element;
}
if (values.Length == 1)
{
XElement newRoot = doc.Descendants("Eq").Single();
doc.RemoveNodes();
doc.Add(newRoot);
}
return doc.ToString(SaveOptions.DisableFormatting);
}
最佳答案
不,您需要处理嵌套 OR
标签;这些是 supported query instructions on CAML
也许 CAML.NET可以帮助您完成任务。
关于CAML 中的 SQL IN 等效项,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1891303/
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