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Master Basics of Database Access with Elke A. Rundensteiner

Learn about SQL commands, creating tables, inserting data, querying tables, and more for effective database management with Elke A. Rundensteiner. Discover interactive and scripting methods in SQLPlus and loading data from text files.

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Master Basics of Database Access with Elke A. Rundensteiner

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  1. More basics on DB access Elke A. Rundensteiner

  2. Working with the Data Server

  3. Basic SQL Commands CREATE TABLE student(sNum INTEGER,sName VARCHAR (30)); -- creates table student with two columns INSERT INTO student VALUES (1, ‘Joe’); -- insert one row into the student table SELECT * FROM student; -- select all rows from student table DELETE FROM student; -- delete all rows in the student table DROP TABLE student; -- drop student table Purge recyclebin; -- purge recyclebin tables that get created. -- Only works if you are logged onto CCC1

  4. Saving your Interactive Session in SQLPlus • If you want to save your output to a file (for homework) • spool <fileName> • <executeCmds to create tables ...> • spool off;

  5. Running scripts in SQLPlus • To enter OS environment, use sqlplus command: Host • Now you can execute OS commands, like : cd.. , exit, etc.

  6. Running scripts in SQLPlus • Create a file in your file system in the current directory called : createTable.sql • @createTable -- executes the script • start createTable -- also executes the script

  7. Saving your Interactive Session in SQLPlus • If you want to save your output to a file (for homework) • spool <fileName> • <executeCmds to create tables ...> • spool off; • Similar to script in unix.

  8. Loading data from a text file • Create a table : • CREATE TABLE myTable1 (a int, b int); • Create data file, say: • sample.dat • Put data into the file : 1,11 2,22 3,33 4,44

  9. Loading from text file (Contd) • Create control file, say load.ctl LOAD DATA INFILE sample.dat INTO TABLE myTable1 FIELDS TERMINATED BY ‘,’ (a,b) • Invoke SQL Loader (from your UNIX shell): • $ sqlldr <user/password> control=load.ctl

  10. Building Interfaces • Call Level Interface • Perl – to build web interfaces • JDBC – Java, servlets, java swing, etc • Embedded SQL • C API (Pro*C) • C++API (Pro*C++) • Java API (SQLJ) [ Oracle ]

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