create barcode using vb.net ANSWERS TO THE EXERCISES in Java

Generation DataMatrix in Java ANSWERS TO THE EXERCISES

APPENDIX B
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ANSWERS TO THE EXERCISES
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By executing some test queries, it becomes apparent which columns of the USER_CONSTRAINTS view you need. Let s look at a first attempt to generate the ALTER TABLE commands. Solution 11-4a. First Attempt to Generate the Correct SQL SQL> select 'ALTER TABLE '||table_name||' DISABLE CONSTRAINT 2 '||constraint_name||';' 3 from user_constraints; However, if you capture the output from this query in a script file and execute it, you will discover that there is room for improvement. Some ALTER TABLE commands may fail with the following message: ORA-02297: cannot disable constraint (BOOK.xxx) - dependencies exist You can fix this problem in two ways: Add the CASCADE keyword to the generated ALTER TABLE commands. Sort the ALTER TABLE commands in such a way that all primary keys are disabled before the foreign key constraints.
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Let s implement both fixes. Also, let s add a WHERE clause to the query to avoid generating ALTER TABLE commands for constraints that are disabled already. Solution 11-4b. Second Attempt to Generate the Correct SQL SQL> 2 3 4 5 select 'ALTER TABLE '||table_name||' DISABLE CONSTRAINT '||constraint_name ||' CASCADE;' from user_constraints where status <> 'DISABLED' order by case constraint_type when 'P' then 1 else 2 end;
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Finally, now that you are satisfied with the result of the query, you add the appropriate SQL*Plus commands to capture and execute the query result. The final script looks like the following. Solution 11-4c. SQL*Plus Script to Disable All Constraints of a Schema set pagesize 0 verify off feedback off trimspool on spool doit.sql replace select 'ALTER TABLE '||table_name|| ' DISABLE CONSTRAINT '||constraint_name||' CASCADE;' from user_constraints where status <> 'DISABLED' order by case constraint_type when 'P' then 1 else 2 end; spool off @doit exit You can build many useful SQL*Plus scripts, once you have discovered how you can use SQL*Plus as a command generator.
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APPENDIX B
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12 Exercises
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1. The SALGRADES table has two columns to indicate salary ranges: LOWERLIMIT and UPPERLIMIT. Define your own SALRANGE_T type, based on a varray of two NUMBER(6,2) values, and use it to create an alternative SALGRADES2 table. Solution 12-1. SQL> create or replace type salrange_t 2 as varray(2) of number(6,2); 3 / Type created. SQL> 2 3 4 5 6 7 8 create table salgrades2 ( grade number(2) , salrange , bonus ) ; constraint S2_PK primary key salrange_t constraint S2_RANGE_NN not null NUMBER(6,2) constraint S2_BONUS_NN not null
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Table created. SQL> 2. Fill the new SALGRADES2 table with a single INSERT statement, using the existing SALGRADES table. Solution 12-2. SQL> 2 3 4 5 insert select , , from into salgrades2 grade salrange_t(lowerlimit,upperlimit) bonus salgrades;
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5 rows created. SQL> col salrange format a25 SQL> select * from salgrades2; GRADE -------1 2 3 4 5 SALRANGE BONUS ------------------------- -------SALRANGE_T(700, 1200) 0 SALRANGE_T(1201, 1400) 50 SALRANGE_T(1401, 2000) 100 SALRANGE_T(2001, 3000) 200 SALRANGE_T(3001, 9999) 500
APPENDIX B
ANSWERS TO THE EXERCISES
5 rows selected. SQL> 3. Create a table TESTNEST with two columns: column X and column MX. Column X is NUMBER(1,0) with values 2, 3, 4, ..., 9. Column MX is a nested table, based on a MX_TAB_T type, containing all multiples of X less than or equal to 20. Solution 12-3a. Table TESTNEST Creation SQL> create or replace type mx_tab_t 2 as table of number(2); 3 / Type created. SQL> 2 3 4 create table testnest ( x number(1,0) , mx mx_tab_t ) nested table mx store as mx_tab;
Table created. SQL> You can use pure INSERT statements to populate the TESTNEST table. The following solution uses PL/SQL to insert all rows in an efficient way. The PL/SQL syntax is straightforward. Solution 12-3b. Table TESTNEST Population SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 15 declare i number; j number; begin for i in 2..9 loop insert into testnest (x, mx) values (i, mx_tab_t()); for j in 1..20 loop exit when i*j > 20; insert into table (select mx from testnest where x=i) values (i*j); end loop; end loop; end; /
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