plsql - How can I use Oracle (PL/SQL) dynamic sql to query data into a %rowtype variable -

-

the problem:

i have table contains clob fixed length record external source. positions 1-5 = fielda, positions 6-12 = fieldb, etc.

i have table (layoutdefinition)that defines record layout, 

fieldname = 'fielda' fieldstart = 1 fieldlength = 5 fieldname = 'fieldb' fieldstart = 6 fieldlength = 6

i need retrieve data clob , put %rowtype variable such "tablea_rec tablea%rowtype."

i have implemented routine uses massive case statement, , loop each row in layoutdefiniton table moves area of clob proper variable in tablea_rec like;

case layoutdefiniton.fieldname when 'fielda' tablea_rec.fielda:= substr(inputclob,layoutdefiniton.fieldstart,layoutdefiniton.fieldlength); when 'fieldb' tablea_rec.fieldb:= substr(inputclob,layoutdefiniton.fieldstart,layoutdefiniton.fieldlength);

this of course inefficient, need loop through layout each record picking apart data.

what create dynamic sql select statement once retrieve data table proper variables. example if not dynamic might like;

select substr(inputclob,1,5), substr(inputclob,6,6) fielda, fieldb clobtable;

can done using dynamic sql?

if syntax like?

the following code extract data clob column , insert destination table

declare   l_sql_str varchar2(4000); begin   src_meta_agg as(     select listagg(field_name, ',') within group(order field_start) field_list            ,listagg('substr(lob,' || field_start || ', ' || field_length || ')', ',') within group( order field_start) field_source       src_meta)     select 'insert dest(' || field_list || ') select ' || field_source ||            ' src' l_sql_str       src_meta_agg;    execute immediate l_sql_str; end;

listagg 11g function orders data , concatenates values. previous versions can use wm_concat or other approach. in l_sql_str have following statement

insert dest(field1,field2) select substr(lob,1, 5),substr(lob,6, 6) src

if need process data in pl/sql code trick

declare   l_sql_str varchar2(4000);   type t_dest_tbl table of dest%rowtype;   l_dest_rows t_dest_tbl;   l_cursor sys_refcursor; begin    src_meta_agg as(     select listagg(field_name, ',') within group(order field_start) field_list            ,listagg('substr(lob,' || field_start || ', ' || field_length || ')', ',') within group( order field_start) field_source       src_meta)     select 'select ' || field_source ||            ' src' l_sql_str       src_meta_agg;    open l_cursor l_sql_str;   fetch l_cursor   bulk collect l_dest_rows;   close l_cursor;     in 1..l_dest_rows.count loop     dbms_output.put_line(l_dest_rows(i).field1 || ', ' || l_dest_rows(i).field2);   end loop; end;

here schema used

create table src(lob clob) / insert src values ('12345abcdef') / insert src values ('78901ghijkl') /  create table src_meta(field_name varchar2(100), field_start number, field_length number) /  insert src_meta values ('field1', 1, 5) / insert src_meta values ('field2', 6, 6) /  create table dest(field1 varchar2(5), field2 varchar2(6)) /

Comments

Post a Comment

Popular posts from this blog

java - activate/deactivate sonar maven plugin by profile? -

-
i use sonar plugin executes if activated in maven profile. sonar runs on every compile. the problem build fail other team members not have sonar application installed locally. pom.xml checked in team members same copy including sonar configuration, don't want them modify purpose of disabling sonar (they might inadvertently check modified copy in). please advise how configure maven (.m2/settings.xml) and/or pom.xml sonar feature can enabled/disabled local profile. here sonar configuration in each project's pom.xml: <plugin> <groupid>org.codehaus.mojo</groupid> <artifactid>sonar-maven-plugin</artifactid> <version>1.0</version> <executions> <execution> <id>make-sonar</id> <phase>compile</phase> <goals> <goal>sonar</goal> </goals> </execution> </executions> ...
Read more

python - TypeError: can only concatenate tuple (not "float") to tuple -

-
i'm new python, question might easy, anyway, patience: as trying call newton-raphson method calculate implied volatility in black-scholes formula call/put option pricing, first thing is, newton method in scipy.optimize seems calculate function's zeros, in black-scholes formula, want function's value option price, not zero. (i'm new here programming, i'm not sure techniques.) should write function things like: def f(sigma, price): return bsformula(s0,k,r,t,q,sigma) - price then, while calling newton method, takes args=() 1 parameter in function, write this: value = newton(bsprice2, 0.5, args=price) but error message: file "bs.py", line 36, in bsimpvol value = newton(bsprice2, 0.5, args=float(price)) file "/usr/lib/python2.7/dist-packages/scipy/optimize/zeros.py", line 143, in newton q0 = func(*((p0,) + args)) typeerror: can concatenate tuple (not "float") tuple could tell me why that? how fix it? apprecia...
Read more

java - What is the difference between String. and String.this. ? -

-
this question has answer here: meaning of .this , .class in java 2 answers i'll straight point. im still learning bit of syntax , want know difference between code is code a: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.valueof(i))); } } please ignore fact i undeclared, not lost. code b: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.this.charat(i))); } } what don't yet understand difference in typing string.this , string. i under assumption when use dot operator on class accessing it's static methods(and/or variables if they're not hidden). i have studied little bit , have concluded when using string. accessing string static methods.. when using string.this. i'm accessing methods class buttonz extendi...
Read more