如何在oracle中获取表作为输出参数
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【中文标题】如何在oracle中获取表作为输出参数【英文标题】:Howto get a table as a out parameter in oracle 【发布时间】:2012-12-10 12:42:58 【问题描述】:我正在尝试将 oracle 过程调用的 out 参数转换为对象。它不起作用,因为 - 据我了解 - 我需要定义一个映射,它告诉方法如何投射它。如果地图是空的或未正确填充,则默认为 STRUCT 类型的 Objekt - 在我的情况下这是错误的。
我已经构建了一个示例,应该可以说明问题:
-- Procedure in database
PROCEDURE myprocedure (
inputParam IN VARCHAR2 (4),
outputOne OUT outputOneSQLType
outputTwo OUT outputTwoSQLType);
-- inside of a package
inside a package mypackage
-- first type
create or replace
TYPE outputOneSQLType IS TABLE OF tableOneExample
-- table of type
create or replace
TYPE tableOneExample AS OBJECT (
somethingOne VARCHAR2 (4)
,somethingTwo NUMBER (12)
)
//java from here
import oracle.jdbc.OracleCallableStatement;
import oracle.jdbc.OracleTypes;
import oracle.jdbc.oracore.OracleTypeADT;
import oracle.sql.STRUCT;
...
oracle.jdbc.driver.OracleConnection oracleConn = (oracle.jdbc.driver.OracleConnection) con.getMetaData().getConnection();
final OracleCallableStatement storedProc = (OracleCallableStatement)oracleConn.prepareCall("call mypackage.myprocedure("+
":inputParam, :outputOne, :outputTwo)");
storedProc.setString("inputParam", "SomeValue");
storedProc.registerOutParameter("outputOne", OracleTypes.STRUCT, "OUTPUTONESQLTYPE");
storedProc.registerOutParameter("outputTwo", OracleTypes.STRUCT, "OUTPUTTWOSQLTYPE");
storedProc.execute();
//So far so good
//now I am lost - I need to define the map to get the object?
//What should be inside the map?
Hashtable newMap = new Hashtable();
newMap.put("outputOneSQLType", ?????.class);
//If the map is empty, it defaults to STRUCT...
final STRUCT myObject = (STRUCT)storedProc.getObject("somethingOne",newMap);
// myObject.getBytes() gives me an object... but I cannot cast it to anything
由于地图有问题,我不能使用类似的东西:
final MyClass myObject = (MyClass)storedProc.getObject("somethingOne",newMap);
我应该如何填写地图?
编辑 1
oracle 数据库中的条目不能更改。我只是被允许使用它们。为此
stmt.registerOutParameter(2, java.sql.Types.ARRAY, "OUTPUTONESQLTYPE");
不起作用。因为只要我不使用“OracleTypes.STRUCT”就会引发异常。似乎在 outputOneSQLType 内部有一个“OracleTypeCOLLECTION”类型的对象
当我尝试时
Hashtable newMap = new Hashtable();
newMap.put("outputOneSQLType",OracleTypeCOLLECTION.class);
final OracleTypeCOLLECTION myObject = (OracleTypeCOLLECTION)storedProc.getObject("somethingOne",newMap);
我得到一个例外:InstantiationException: oracle.jdbc.oracore.OracleTypeCOLLECTION
@DazzaL:我将尝试定义一个 SQLDATA 接口。也许这就是解决方案
解决方案
-
准备好的语句应该类似于“begin package.procedure(...); end;”和不“call package.procedure(...))
需要一个 SQLData 接口。
@DazzaL:你统治!谢谢。
【问题讨论】:
【参考方案1】:你必须定义一个 sqldata 对象来映射它。
文档:http://docs.oracle.com/cd/E11882_01/java.112/e16548/oraarr.htm#JJDBC28574
例如:
SQL> create or replace TYPE tableOneExample AS OBJECT (
2 somethingOne VARCHAR2 (4)
3 ,somethingTwo NUMBER (12)
4 );
5 /
Type created.
SQL> create or replace TYPE outputOneSQLType IS TABLE OF tableOneExample;
2 /
Type created.
SQL>
SQL> create or replace PROCEDURE myprocedure (
2 inputParam IN VARCHAR2,
3 outputOne OUT outputOneSQLType)
4 as
5 begin
6 outputOne := outputOneSQLType(tableOneExample('a', 1), tableOneExample('b', 2));
7 end;
8 /
Procedure created.
现在我们定义 SQLDATA 接口:
import java.sql.*;
public class TestArr implements SQLData
private String sql_type;
public String attrOne;
public int attrTwo;
public TestArr()
public TestArr (String sql_type, String attrOne, int attrTwo)
this.sql_type = sql_type;
this.attrOne = attrOne;
this.attrTwo = attrTwo;
// define a get method to return the SQL type of the object
public String getSQLTypeName() throws SQLException
return sql_type;
// define the required readSQL() method
public void readSQL(SQLInput stream, String typeName)
throws SQLException
sql_type = typeName;
attrOne = stream.readString();
attrTwo = stream.readInt();
// define the required writeSQL() method
public void writeSQL(SQLOutput stream)
throws SQLException
stream.writeString(attrOne);
stream.writeInt(attrTwo);
确保流写入/读取的输入和顺序与您的 oracle 类型相同,因为任何不一致都会导致内部表示错误。
然后在主类中,您将其映射如下:
CallableStatement stmt = conn.prepareCall("begin myprocedure(?,?); end;");
stmt.setString(1, "foo");
stmt.registerOutParameter(2, java.sql.Types.ARRAY, "OUTPUTONESQLTYPE"); // YOUR ARRAY TYPE (TO MATCH THE API OUTPUT), NOT OBJECT
stmt.execute();
Array arr = stmt.getArray (2);
Map map = conn.getTypeMap();
map.put("TABLEONEEXAMPLE", Class.forName("TestArr")); // YOUR OBJECT TYPE, NOT ARRAY.
Object[] values = (Object[]) arr.getArray();
for (int i=0; i < values.length; i++)
TestArr a = (TestArr)values[i];
System.out.println("somethingOne: " + a.attrOne);
System.out.println("somethingTwo: " + a.attrTwo);
结果比恩:
M:\Documents\Sample Code\1>javac TestArr.java
M:\Documents\Sample Code\1>javac ArrayTest.java
Note: ArrayTest.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
M:\Documents\Sample Code\SQLComplexArray>java ArrayTest
Opening Oracle connection...done.
somethingOne: a
somethingTwo: 1
somethingOne: b
somethingTwo: 2
【讨论】:
谢谢。我将尝试定义一个 SQLDATA 接口。也许这就是解决方案。 太棒了,谢谢!我希望我可以添加 +10 为我工作得很好,也发布了我的帖子 - ***.com/questions/25253448/…以上是关于如何在oracle中获取表作为输出参数的主要内容,如果未能解决你的问题,请参考以下文章
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