In SQL, SavePoint, RollBack, and Commit are essential components of Transaction Control Language. In this tutorial, you will learn about TCL Commands in SQL with the help of examples.
In this section, we will be discussing types of SQL commands. SQL Commands are divided into five broad categories – DDL, DML, DCL, TCL, and DQL. Each category is further explained below: 1. Data Definition Language(DDL): The Data Definition Language is made up of SQL commands that can ...
The command of DML is not auto-committed that means it can't permanently save all the changes in the database. They can be rollback. Here are some commands that come under DML: INSERT UPDATE DELETE a. INSERT:The INSERT statement is a SQL query. It is used to insert data into the ro...
Transaction Control Language(TCL) commands are used to manage transactions in the database. Before moving forward with TCL commands, check these topics out first:DML commands DDL COMMAND These are used to manage the changes made to the data in a table by DML statements. It also allows ...
wordstart findstring index Return the index in findstring of the first character in the word containing the character at index.Examples of some commonly used Tcl string sub commands are given below.String Comparison#!/usr/bin/tclsh set s1 "Hello" set s2 "World" set s3 "World" puts [string...
Packed with practical examples, the book not only takes you through the implementation of network protocols in Tcl, but also key aspects of Tcl programming. The book starts with the basic element of Tcl programming as we take a look at the syntax and fundamental commands of the language. To...
LOG("Tk stub initialized");//LOG("Creating commands");/// Create the wrapping commands in the CxImage namespace linked to custom functions with a NULL clientdata and// no deleteproc inside the current interpreterTcl_CreateObjCommand(interp,"::CxImage::Convert", Tk_Convert, (...
-nobackslashes??-nocommands??-novariables? string -no 后面接什么就不置换什么 例子: set a "alpha" set b a puts {a and b with no substitution: $a $$b} puts "a and b with one pass of substitution: $a $$b" puts "a and b with subst in braces: [subst {$a $$b}]" puts "...
示例9: Sv_RegisterListCommands ▲点赞 1▼ voidSv_RegisterListCommands(void){staticintinitialized =0;if(initialized ==0) { Tcl_MutexLock(&initMutex);if(initialized ==0) {/* Create list with 1 empty element. */Tcl_Obj *listobj =Tcl_NewObj(); ...
DML(Data Manipulation Language) :The SQL commands that deals with the manipulation of data present in the database belong to DML or Data Manipulation Language and this includes most of the SQL statements. Examples of DML: INSERT– is used to insert data into a table. ...