how to write cursor

CursorA cursor is a data buffer opened by the system for the user, which holds the results of the SQL statement execution. Each cursor area has a name that allows the user to retrieve the record from the cursor one at a-and assign it to the main

I. EXPLICIT cursorExplicit is relative to the implicit cursor, which is the cursor with a clear declaration. The declaration of an explicit cursor is similar to the following (the detailed syntax participates in PLSQL ref doc):Cursor cursor_name

There are two types of cursors in Oracle: an explicit cursor, an implicit cursor. A display cursor is a cursor defined with the cursor...is command that handles multiple records returned by a query statement (SELECT), while an implicit cursor is a

Cursor and dynamic SQL, cursor dynamic SQL Cursor type: Static cursor (the cursor is statically bound to a select statement during compilation. This cursor can only act on one query statement) and dynamic cursors (that is, we want our query

I. EXPLICIT cursorExplicit is relative to the implicit cursor, that is, there is a clear declaration of the cursor. The declaration of an explicit cursor is similar to the following (specific syntax for Plsql ref doc):Cursor cursor_name (parameter

Query The SELECT statement is used to query data from the database. When the SELECT statement is used in PL/SQL, it must be used with the INTO clause. The return value of the query is assigned to the variable in the INTO clause, variable

  During database development, when the data you retrieve is only one record, the transaction statement code you write usually uses the Select Insert statement. However, we often encounter this situation, that is, reading a record from a result set

A major reason for using cursor is to convert the set operation into a single record processing method. After retrieving data from a database using SQL, the results are stored in a memory area, and the results are often a collection containing

During database development, when the data you retrieve is only one record, the transaction statements you writeCodeSelect Insert statements are usually used. However, we often encounter this situation, that is, reading a record from a result set

During database development, when the data you retrieve is only one record, the transaction statements you writeCodeSelect Insert statements are usually used. However, we often encounter this situation, that is, reading a record from a result set