四、DECLARE CURSOR WITH PARAMETER (%ISOPEN) DECLARE t_name books.books_name%TYPE; CURSOR cur(id varchar2) IS SELECT books_name FROM books WHERE books_id=id; BEGIN IF cur%ISOPEN THEN --%ISOPEN DBMS_OUTPUT.PUT_LINE('CURSOR HAS BEEN OPENED!'); ELSE OPEN CUR('0003'); END IF; FETCH c...
The result set of this cursor is all course_numbers whose subject_id matches the subject_id passed to the cursor via the parameter. Cursor with return clause The basic syntax for a cursor with a return clause is: CURSOR cursor_name RETURN field%ROWTYPE IS SELECT_statement; For example, you...
Ifyou have no library cache misses, then you might be able to accelerateexecution calls by setting the value of the initialization parameter CURSOR_SPACE_FOR_TIME to true. This parameter specifieswhether a cursor can be deallocatedfromthe library cache to make room for anew SQL statement. CURSOR...
-- define cursorCURSORcursor_name[(parameter[,parameter]…)][RETURNdatatype]ISselect_statement;-- open cursorOPENcursor_name[([parameter=>]value[,[parameter=>]value]…)];-- fetch cursorFETCHcursor_nameINTO{variable_list|record_variable };--close cursorCLOSEcursor_name; 举一个例子:输出员工表中...
OracleParameter.Value 屬性參考 意見反應 定義命名空間: System.Data.OracleClient 組件: System.Data.OracleClient.dll 取得或設定 參數的值。 C# 複製 [System.ComponentModel.TypeConverter(typeof(System.ComponentModel.StringConverter))] public override object Value { get; set; } 屬性值 Object 對象,這個...
指定字段或属性的数据类型,以用于 OracleParameter。C# 复制 public enum OracleType继承 Object ValueType Enum OracleType 字段展开表 BFile 1 Oracle BFILE 数据类型,它包含存储在外部文件中的最大为 4 GB 的二进制数据的引用。 使用具有 OracleBFile 属性的 OracleClient Value 数据类型。 Blob 2 包含二进制...
(4)If stored outlines were generated with CURSOR_SHARING set to EXACT, then the database does not use stored outlines generated with literals. To avoid this problem, generate outlines with CURSOR_SHARING set to FORCE or SIMILAR and use the CREATE_STORED_OUTLINES parameter. ...
(New OracleParameter( "N_EMPNO", OracleType.Number)).Value = 7369 cmd.Parameters.Add(New OracleParameter( "IO_CURSOR", OracleType.Cursor)).Direction = ParameterDirection.Output rdr = cmd.ExecuteReader() While (rdr.Read()) REM do something with the values End While rdr.Close() End Using ...
A partial update may be performed only with Cursor.putCurrent. A null or partial DatabaseEntry output parameter may also be used in other cases, for example, to retrieve a partial key item. However, in practice this has limited value since the entire key is usually needed by the ...
Forward references are not allowed in PL/SQL. So, you must declare a cursor before referencing it in other statements. When you declare a cursor, you name it and associate it with a specific query using the syntax CURSOR cursor_name [(parameter[, parameter]...)][RETURN return_type] IS ...