[英]How to return an array from Java to PL/SQL?
I have no problems to pass numbers and strings back and forth from PL/SQL to Java, but how do I pass arrays ? 从PL / SQL到Java来回传递数字和字符串没有问题,但是如何传递数组呢? I'm calling Java from PL/SQL - not other way round.
我从PL / SQL调用Java - 而不是其他方式。
Below is an example where get_widgets_as_string
works as expected. 下面是
get_widgets_as_string
按预期工作的示例。 How do I write a PL/SQL call specification for so19j.get_widgets_as_array()
so that I can call it from PL/SQL ? 如何为
so19j.get_widgets_as_array()
编写PL / SQL 调用规范 ,以便我可以从PL / SQL调用它?
I have read Publishing Java Classes With Call Specifications where I can see that nested table corresponds to oracle.sql.ARRAY
, but I can't get it working. 我已经阅读了发布带有调用规范的Java类 ,我可以看到嵌套表对应于
oracle.sql.ARRAY
,但是我无法使其工作。 I'm probably missing some trivial details because I'm not a Java programmer. 我可能错过了一些微不足道的细节,因为我不是Java程序员。
create or replace and compile java source named "so19j" as
import java.lang.*;
public class so19j {
public static String get_widgets_as_string() {
String widgets = "foo;bar;zoo";
return widgets;
}
public static String[] get_widgets_as_array() {
String[] widgets = new String[]{"foo", "bar", "zoo"};
return widgets;
}
};
/
show errors java source "so19j"
create or replace function get_widgets_as_string return varchar2 as
language java name 'so19j.get_widgets_as_string() return java.lang.String';
/
show errors
declare
widgets constant varchar2(32767) := get_widgets_as_string;
begin
dbms_output.put_line('widgets = ' || widgets);
end;
/
/* How to write a call specification for so19j.get_widgets_as_array so that it
can be excercised by the PL/SQL block below ? */
declare
type widgets_t is table of varchar2(32767);
widgets constant widgets_t := get_widgets_as_array;
begin
for i in widgets.first .. widgets.last loop
dbms_output.put_line('widgets(' || i || ') = ' || widgets(i));
end loop;
end;
/
/* The type has to be SQL type so that it is also visible for Java. */
create or replace type widgets_t is table of varchar2(32767);
/
create or replace and compile java source named "so19ja" as
import java.lang.*;
public class so19ja {
public static String[] get_widgets_as_array() {
String[] widgets = new String[]{"foo", "bar", "zoo"};
return widgets;
}
public static java.sql.Array array_wrapper(
String typeName,
Object elements
) throws java.sql.SQLException {
oracle.jdbc.OracleDriver ora = new oracle.jdbc.OracleDriver();
java.sql.Connection conn = ora.defaultConnection();
oracle.jdbc.OracleConnection oraConn =
(oracle.jdbc.OracleConnection)conn;
/* Yeah - typeName have to be UPPERCASE, really. */
java.sql.Array arr =
oraConn.createARRAY(typeName.toUpperCase(), elements);
return arr;
}
public static java.sql.Array get_widgets_as_array_wrapped()
throws java.sql.SQLException {
return array_wrapper("widgets_t", get_widgets_as_array());
}
};
/
show errors java source "so19ja"
create or replace function get_widgets_as_array return widgets_t as
language java name 'so19ja.get_widgets_as_array_wrapped() return java.sql.Array';
/
show errors
declare
widgets constant widgets_t := get_widgets_as_array;
begin
for i in widgets.first .. widgets.last loop
dbms_output.put_line('widgets(' || i || ') = ' || widgets(i));
end loop;
end;
/
Prints: 打印:
widgets(1) = foo
widgets(2) = bar
widgets(3) = zoo
PL/SQL procedure successfully completed.
See also: How to create an oracle.sql.ARRAY object? 另请参见: 如何创建oracle.sql.ARRAY对象?
我不知道pl / sql的事情,但你可以做的是处理PL / SQL的结果并将结果插入到set方法中,然后你就可以得到它。
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