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DECLARE CURSOR species_cur IS SELECT sp.id, FROM json_species sp FOR UPDATE; l_species json_object_t; l_species_for_update json_species.info%TYPE; l_current_name VARCHAR2 (1000); l_new_name VARCHAR2 (1000); BEGIN FOR rec IN species_cur LOOP l_species := json_object_t (rec.info); l_current_name := l_('name').to_string; l_new_name := TRIM (BOTH '"' FROM UPPER (l_current_name)); l_('name', l_new_name); l_species_for_update := l_species.stringify; UPDATE json_species SET info = l_species_for_update WHERE CURRENT OF species_cur; END LOOP; END; As you get more comfortable with these PL/SQL object types for JSON and their methods, you will look at that code and say “We don’t need to do all that, Steven! You can replace lines 17 though 21 with a single statement: But when you are first working with these types, you will likely want to trace each step of the transformation to make sure you get it right. As you might expect, there’s more than one method for modifying the contents of a JSON document.PL/SQL object types for JSON also offer the following methods.During a recent migration project for one of our customers, I needed to export certain XML rows from a Novell Sentinel 6.1 Oracle 10G R2 Hotfix 4 Database.In particular, I found that it was not possible to export Filter Configuration in Novell Sentinel 6.1 and I needed the 250 Filters in the new Database and new Sentinel Server.The restrictions in place made it impossible to edit the fields using utilities such as DBVIS or Toad for Oracle.I wanted to be able to write SQL Statements that allowed files to be read into the stream and update the backend database column (CLOB).Then you store that serialized data back into the database table—or pass it along to a consumer of this data, such as a Java Script-based web application.As with so many other data structures manipulated in PL/SQL, you don’t have to worry about freeing up the memory associated with these instances.
This is definitely and demonstrably not the case, especially with Oracle Database 12.2.First, I call the constructor function for JSON_OBJECT_T, passing it the JSON character large object (CLOB) data. Instead, you retrieve the document from the table, make changes to the document’s contents using the PL/SQL API in Oracle Database 12.2 or 12.1 string operations on the JSON text, and then use a SQL UPDATE to replace the entire document.Let’s go through the steps needed to implement the following requirement for my species table: all names need to be in uppercase. Listing 1: Use PL/SQL object types for JSON to change all names to uppercase.This article gives you a starting point for manipulating JSON in PL/SQL.Future articles will explore the topic in greater detail.
Generally, if an operation in SQL or PL/SQL results in an error, an exception is raised, halting execution of the block.