It is created on a SELECT statement which returns more than one row. Following are the steps for creating a cursor. Explicit cursors. If you do not explicitly close a cursor, MySQL will close it automatically when the END statement is reached. A DECLARE CURSOR statement has the following syntax: By Allen G. Taylor . Here is an updated version of the previous example: Programmers are allowed to create named context area to execute their DML operations to get more control over it. Explicit cursors are defined by programmers to gain more control over the context area. A cursor can hold more than one row, but can process only one row at a time. In MySQL, Cursor can also be created. A cursor holds the rows (one or more) returned by a SQL statement. To use a SQL cursor, you first must declare its existence to the DBMS. Therefore, cursors are used as to speed the processing time of queries in large databases. Explicit Cursor. Working with PL/SQL Cursor. However, a cursor does not need to be declared again to be used; an OPEN statement is sufficient. The set of rows the cursor holds is called the active set. You do this with a DECLARE CURSOR statement. It is an essential component in stored procedures. The cursor block is so ugly that it's difficult to use in a clear and effective way. A cursor can’t be used by itself in MySQL. PL/SQL Explicit Cursor Example. A cursor in SQL is a temporary work area created in system memory when a SQL statement is executed. There are two types of cursors in PL/SQL : Implicit cursors. A SQL cursor is a set of rows together with a pointer that identifies a current row. After a cursor is closed, it cannot be reused without being opened again. PL/SQL controls the context area through a Cursor. A PL/SQL cursor is a pointer that points to the result set of an SQL query against database tables. Both implicit and explicit cursors have the same functionality, but they differ in the way they are accessed. I think cursors are still a bad choice unless you understand enough about them to justify their use in limited circumstances. Example Database Cursors in SQL. SQL is a set based language--that's what it does best. The explicit cursor should be defined in the declaration section of the PL/SQL block, and it is created for the 'SELECT' … MySQL Cursor. Let's take an example to demonstrate the use of explicit cursor. PL/SQL controls the context area through a cursor. The purpose of this example isn’t to go full detail on how to build a cursor, we’ll do that in a later article, rather, it’s to show you an example so you’ll be able to recognize them. The DECLARE CURSOR statement doesn’t actually cause anything to happen; it just announces the SQL cursor’s name to the DBMS and specifies what query the cursor will operate on. Let’s examine each step in greater detail. The set of rows the cursor holds is referred to as the active set. I have written a stored procedure which will travel's record from one table and insert those into 2-3 different tables using insert statements. Also, if the cursor is defined as SCROLLABLE we can even move back to the previous row. It is defined in the declaration section of the PL/SQL block. Another reason I don't like cursors is clarity. Mysql cursor issue? A cursor is a temporary work area created in the system memory when a SQL statement is executed. A cursor is a select statement, defined in the declaration section in MySQL.. Syntax A cursor contains information on a select statement and the rows of data accessed by it. You can name a cursor so that it could be referred to in a program to fetch and process the rows returned by the SQL … Declare Cursor. The following picture describes steps that you need to follow when you work with a PL/SQL cursor: PL/SQL Cursor. 1.