如何从 Java 类中调用带有 out 参数作为表类型的过程
我想从 Java 代码中调用包 ult_pkg
中的这个过程 get_data_Q1
并显示输出:
I want to call this procedure get_data_Q1
in the package ult_pkg
from Java code and display the output:
CREATE OR REPLACE PACKAGE ult_pkg
AS
TYPE t_all_record is record (
x_object_type_id number,
x_object_name varchar2(100),
x_object_id varchar2(70),
x_audit_timestamp timestamp(6),
x_payload clob
);
--table type to hold table data after querying
type tt_all_tab is table of t_all_record index by binary_integer;
--declaration pocedures
procedure get_data_Q1(x_object_id in varchar2 , x_all_type out tt_all_tab );
end ult_pkg;
/
--body of 'ult_pkg' package
create or replace package body ult_pkg
AS
--procedure taking 'object_id' as input parameter and gives out table of 't_all_record' type
procedure get_data_Q1(x_object_id in varchar2 , x_all_type out tt_all_tab )
AS
i number:=0;
begin
for r in
(
SELECT
O.object_type_id,O.object_name,O.object_id,A.audit_timestamp,P.payload
FROM
APPLICATION APP, EXCEPTIONS E,MASTER_AUDIT A,MODULE_TYPE M,OBJECT_TYPE O,PAYLOAD P
WHERE
( A.MODULE_TYPE_ID = M.MODULE_TYPE_ID ) AND ( M.APPLICATION_ID = APP.APPLICATION_ID ) AND ( A.OBJECT_TYPE_ID = O.OBJECT_TYPE_ID ) AND ( O.OBJECT_ID = x_object_id )
)
-- loop to asign the data from cursor 'r' to carasponding table type columns
loop
x_all_type(i).x_object_type_id:=r.object_type_id;
x_all_type(i).x_object_name:=r.object_name;
x_all_type(i).x_object_id:=r.object_id;
x_all_type(i).x_audit_timestamp:=r.audit_timestamp;
x_all_type(i).x_payload:=r.payload;
i:=i+1;
end loop;
end get_data_Q1;
end ult_pkg;
/
推荐答案
这不可能,参见 访问 PL/SQL 索引表:
Oracle JDBC 不支持 RAW、DATE 和 PL/SQL RECORD 作为元素类型.
Oracle JDBC does not support RAW, DATE, and PL/SQL RECORD as element types.
我可能会像这样使用自定义(全局,而不是包)对象类型:
I'd probably use a custom (global, not package) object type like so:
CREATE TYPE t_all_record AS OBJECT (
x_object_type_id number,
x_object_name varchar2(100),
x_object_id varchar2(70),
x_audit_timestamp timestamp(6),
x_payload clob
)
/
CREATE TYPE t_all_records IS TABLE OF t_all_record
/
引用包中的类型表(t_all_records 而不是 tt_all_tab)并像这样填充
reference the table of type in your package (t_all_records instead of tt_all_tab) and fill it like so
procedure get_data_Q1(x_object_id in varchar2 , x_all_type out t_all_records )
AS
begin
SELECT t_all_record(O.object_type_id,O.object_name,O.object_id,A.audit_timestamp,P.payload)
BULK COLLECT INTO x_all_type
FROM APPLICATION APP, EXCEPTIONS E,MASTER_AUDIT A,MODULE_TYPE M,OBJECT_TYPE O,PAYLOAD P
WHERE ( A.MODULE_TYPE_ID = M.MODULE_TYPE_ID ) AND ( M.APPLICATION_ID = APP.APPLICATION_ID ) AND ( A.OBJECT_TYPE_ID = O.OBJECT_TYPE_ID ) AND ( O.OBJECT_ID = x_object_id )
end get_data_Q1;
结果可以像这样从java中使用:
Result will be useable from java like so:
package tests.jdbc;
import java.sql.Array;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSetMetaData;
import java.sql.Struct;
import java.sql.Types;
import oracle.sql.StructDescriptor;
public class OracleTableOfResult {
public static void main(String...a) throws Exception {
Class.forName("oracle.jdbc.OracleDriver");
Connection connection = DriverManager.getConnection("jdbc:oracle:thin:<USER>/<PASS>@<DATABASEHOST>:1521:<SERVICE>");
final String typeName = "T_ALL_RECORD";
final String typeTableName = "T_ALL_RECORDS";
// Get a description of your type (Oracle specific)
final StructDescriptor structDescriptor = StructDescriptor.createDescriptor(typeName.toUpperCase(), connection);
final ResultSetMetaData metaData = structDescriptor.getMetaData();
// Call the procedure (or whatever else) that returns the table of a custom type
CallableStatement cs = connection.prepareCall("{call ult_pkg.get_data_Q1(?, ?)}");
cs.setString(1, "the_id");
// Result is an java.sql.Array...
cs.registerOutParameter(2, Types.ARRAY, typeTableName);
cs.execute();
// ...who's elements are java.sql.Structs
Object[] data = (Object[]) ((Array) cs.getObject(2)).getArray();
for(Object tmp : data) {
Struct row = (Struct) tmp;
// Attributes are index 1 based...
int idx = 1;
for(Object attribute : row.getAttributes()) {
System.out.println(metaData.getColumnName(idx) + " = " + attribute);
++idx;
}
System.out.println("---");
}
cs.close();
connection.close();
}
}
但最终,当您可以在简单的 sql 语句中将查询用作准备好的语句时,是否值得付出努力是值得怀疑的……
But in the end, it's questionable if it's worth the effort when you could use your query in a plain sql statement as a prepared statement…
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