Oracle中的C#,绑定变量和ID IN(1,2,3)之类的查询

我正在寻找以下Java技术的C#ODAC改编,其中代码能够将数字数组(数组大小可以变化)绑定到非PL / SQL SELECT语句中,然后在WHERE ID IN (...)使用结果数组WHERE ID IN (...)样式检查。

http://rafudb.blogspot.com/2011/10/variable-inlist.html

这是在基于OCI的C程序中使用的这种技术的另一个例子:

Oracle OCI,绑定变量和ID IN(1,2,3)之类的查询

具体来说,我们想要执行一个类似的查询

 SELECT * FROM MyTable WHERE ID IN (SELECT * FROM TABLE(:1)) 

并将一系列Numbers传入:1

码:

 oraParam.UdtTypeName = "SYS.ODCINUMBERLIST"; VArray newArray = new VArray(); newArray.Array = new Int32[] {12,24,42}; oraParam.OracleDbType = OracleDbType.Array; oraParam.Value = newArray; string query = @"Select * from TABLE(:1) "; OracleCommand command = new OracleCommand(query, MyConnection); command.Parameters.Add(oraParam); OracleDataReader reader; var m_connection = new OracleConnection("The CONNECTION STRING"); m_connection.Open(); var reader = command.ExecuteReader(); reader.Close(); m_connection.Close(); 

接下来是以下助手类:

 class VArray : IOracleCustomType, INullable { [OracleArrayMapping()] public Int32[] Array; private OracleUdtStatus[] m_statusArray; public OracleUdtStatus[] StatusArray { get { return this.m_statusArray; } set { this.m_statusArray = value; } } private bool m_bIsNull; public bool IsNull { get { return m_bIsNull; } } public static VArray Null { get { VArray obj = new VArray(); obj.m_bIsNull = true; return obj; } } public void ToCustomObject(OracleConnection con, IntPtr pUdt) { object objectStatusArray = null; Array = (Int32[])OracleUdt.GetValue(con, pUdt, 0, out objectStatusArray); m_statusArray = (OracleUdtStatus[])objectStatusArray; } public void FromCustomObject(OracleConnection con, IntPtr pUdt) { OracleUdt.SetValue(con, pUdt, 0, Array, m_statusArray); } public override string ToString() { if (m_bIsNull) return "VArray.Null"; else { string rtnstr = String.Empty; if (m_statusArray[0] == OracleUdtStatus.Null) rtnstr = "NULL"; else rtnstr = Array.GetValue(0).ToString(); for (int i = 1; i < m_statusArray.Length; i++) { if (m_statusArray[i] == OracleUdtStatus.Null) rtnstr += "," + "NULL"; else rtnstr += "," + Array.GetValue(i).ToString(); } return "VArray(" + rtnstr + ")"; } } } [OracleCustomTypeMapping("SYS.ODCINUMBERLIST")] public class VArrayFactory : IOracleCustomTypeFactory, IOracleArrayTypeFactory { // IOracleCustomTypeFactory public IOracleCustomType CreateObject() { return new VArray(); } // IOracleArrayTypeFactory Interface public Array CreateArray(int numElems) { return new Int32[numElems]; } public Array CreateStatusArray(int numElems) { // CreateStatusArray may return null if null status information // is not required. return new OracleUdtStatus[numElems]; } } 

描述:

一般的想法是,与OCI示例类似,您必须将参数转换为SYS.ODCINUMBERLIST(或其他有效类型)。 默认情况下,在C#OracleDBType中未定义该类型,因此必须使用UdtTypeName和自定义Factory / Class才能成功绑定。

这是受以下关于定义自定义类型的post的启发。

限制:

此精确解决方案仅适用于INT / NUMBER值,因为它是从SYS.ODCINUMBERLIST表类型中捎带的。 如果其他类型需要它,您可能需要查找/写入其他自定义表类型。

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