cursor

Original: http://ntk2006.blog.sohu.com/135331235.html Cursor ConceptCursors provide a flexible way to retrieve and operate data from tables. cursors are mainly used on servers to process SQL statements sent from clients to servers, or data

I. cursor Recognition Cursor allows you to access the result set returned by SQL Server row by row.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

Cursor is a complex concept in the database field, because it contains shared cursor and session cursor. The two have different concepts and forms.The concept of shared cursor is easy to confuse with the cursor defined in SQL statements. This

Today, we will briefly summarize the usage of cursor in PL/SQL. Cursor category: -- Explicit cursor-- Static cursor | | -- Implicit cursorCursor |-- Strong type (Restriction), specifying the return type-- Dynamic Cursor -- ref cursor |-- Weak type

Oracle Database: PL/SQL cursor overview, oracleplI. cursor Concept Literally, it refers to a swimming cursor, which is a handle or pointer pointing to the context area. When performing the CRUD operation in the PL/SQL block, ORACLE allocates a

Transferred from: http://developer.hi.baidu.com/#/detail/15344654this day's simple summary of the usage of cursor (cursor/cursor) in pl/ SQL. I believe many DBAs who are engaged in development or maintenance have encountered similar face-to-face

The difference among Cursor, hidden Cursor, and dynamic Ref Cursor is displayed in PLSQL. plsqlref1. Explicit cursorExplicit is relative to implicit cursor, that is, there is a clear declared cursor. The declaration of an explicit cursor is similar

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

Today, we will briefly summarize the usage of cursor in PL/SQL. I believe many DBAs who are engaged in development or maintenance have encountered similar face-to-face problems when looking for a job: Please briefly describe the type of the cursor,

Cursor is a method for processing data. To view or process data in a result set, A cursor provides the ability to forward or backward data in a result set by one or more rows. We can use a cursor as a pointer, which can specify any position in the

Records the Issue that cannot be created in CursorWindow due to memory exhaustion (error-12) caused by cursor leakage on Android. [Symptom] 20:27:36-30. 751 E/CursorWindow (760): cocould not allocate CursorWindow '/data/com. android. providers.

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

1. What is a cursor?① Retrieve the result set from the table and point to a record for interaction at a time.② Operations in relational databases are performed on the complete set of rows.The row set returned by the SELECT statement includes all

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

The concept of cursors: A cursor is a memory workspace of SQL that is defined by the system or user as a variable. The role of a cursor is to temporarily store blocks of data that are extracted from the database. In some cases, the data needs to be

Basic Oracle cursor and basic oracle cursor I. cursorThe cursor is used to process the multi-row records retrieved from the database (using the SELECT statement ). With the cursor, the program can process and traverse the entire record set returned

Detailed description of Oracle CURSOR instance, oraclecursor CURSORI,Cursor Overview Cursor is a data buffer provided by the database system in the memory. It stores the execution results of SQL statements. Each cursor has a name. You can use SQL

1, what is a cursor? ① retrieves the result set from the table, and the mechanism from which each point points to a record for interaction.The operations in the ② relational database are performed on the complete rowset.The rowset returned by the

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

1. Cursor conceptLiterally, it refers to a swimming cursor, which is a handle or pointer pointing to the context area.When performing the CRUD operation in the PL/SQL block, ORACLE allocates a context zone for it in the memory. The database language