Transfer:

The meaning of %type in the oracle stored procedure

CREATE OR REPLACE
procedure getDeptById
(
v_deptno in dept.deptno%type
)
is
v_dname dept.dname%type;
v_loc dept.loc%type;
begin
select dname,loc into v_dname,v_loc from dept where deptno = v_deptno;
dbms_output.put_line(v_dname||‘***‘||v_loc);
end;

2018-11-07 11:43:56 lizhi_ma Reading number 1361More

Classification column: Database

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Example:

CREATE OR REPLACE
procedure getDeptById
(
v_deptno in dept.deptno%type
)
is
v_dname dept.dname%type;
v_loc dept.loc%type;
begin
select dname,loc into v_dname,v_loc from dept where deptno = v_deptno;
dbms_output.put_line(v_dname||‘***‘||v_loc);
end;

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v_deptno is a defined variable, dept is a table in the database, there is a deptno field in the table, and then% type is the data type of deptno.
The popular understanding is to let the type of the variable v_deptno match the type of the table field in the database, so that you don’t have to worry about the problem of type mismatch.

There are two advantages of using %type:

• You don’t need to know the number of columns and data types in the referenced database.
• The number of columns and data types in the referenced database can be changed in real time.