Java调用存储过程:

结合SQL操作与存储过程

 

create procedure set_death_age(poet VARCHAR2, poet_age NUMBER)

poet_id NUMBER;

begin SELECT id INTO poet_id FROM poets WHERE name = poet;

INSERT INTO deaths (mort_id, age) VALUES (poet_id, poet_age);

end set_death_age;  

下面是调用上面存储过程的Java代码:

public static void setDeathAge(Poet dyingBard, int age) throws SQLException{

Connection con = null;

CallableStatement proc = null;

try {

con = connectionPool.getConnection();

proc = con.prepareCall("{ call set_death_age(?, ?) }");

proc.setString(1, dyingBard.getName());

proc.setInt(2, age);

proc.execute();

}

finally {

try { proc.close(); }

catch (SQLException e) {}

con.close();

}

}  

 

 

 

Functions

存储过程可以有返回值,所以CallableStatement类有类似getResultSet这样的方法来获取返回值。当存储过程返回一个值时,你必须使用registerOutParameter方法告诉JDBC驱动器该值的SQL类型是什么。你也必须调整存储过程调用来指示该过程返回一个值。

下面接着上面的例子。这次我们查询Dylan Thomas逝世时的年龄。这次的存储过程使用:

create function snuffed_it_when (VARCHAR) returns integer ''declare

poet_id NUMBER;

poet_age NUMBER;

begin

--first get the id associated with the poet.

SELECT id INTO poet_id FROM poets WHERE name = $1;

--get and return the age.

SELECT age INTO poet_age FROM deaths WHERE mort_id = poet_id; 

return age;

end;

下面是调用这个存储过程的Java代码:

 

 

connection.setAutoCommit(false);

CallableStatement proc = connection.prepareCall("{ ? = call snuffed_it_when(?) }"); proc.registerOutParameter(1, Types.INTEGER);

proc.setString(2, poetName); cs.execute();

int age = proc.getInt(2); 

 

 

 

在使用存储过程中,我们有时需要传递可变数组,存在两种情况,存储过程有输入或输出参数为自定义可变数组的。在java代码中,如何正确调用oracle存储过程的自定义可变数组类型,在这里做一下示例说明.

 

java调用oracle存储过程的自定义类型:

 

plsql定义字符串和数值型可变数组:

 

一.定义全局类型:

 

CREATE OR REPLACE TYPE USERSEQID_ARRAY IS VARRAY(50000) OF NUMBER(9)

 

CREATE OR REPLACE TYPE USERNAME_ARRAY  AS VARRAY(32) of varchar(32)

 

CREATE OR REPLACE TYPE USERPWD_ARRAY  AS VARRAY(50000) of varchar(60)

 

二.java调用输出参数为自定义数组的存储过程:

 

2.1 输出参数为自定义数组的存储过程make_logincard_pro:

 

procedure make_logincard_pro (

p_cardsuitcode in varchar,

p_userseqidArr out USERSEQID_ARRAY ,

p_usernameArr out USERNAME_ARRAY

)

IS

v_addedtime date:= sysdate;

 

BEGIN

 

    FOR ii IN 1 .. 10 LOOP

 

        IF p_userseqidArr IS NULL THEN

          p_userseqidArr := USERSEQID_ARRAY(ii);

        ELSE

           p_userseqidArr.EXTEND;   --超过数组定义大小(50000)将抛出异常 

           p_userseqidArr(ii) := ii;               

        END IF;

 

        IF p_usernameArr IS NULL THEN

          p_usernameArr := USERSEQID_ARRAY(ii || 'TT');

        ELSE

           p_usernameArr.EXTEND;      --超过数组定义大小(32)将抛出异常

           p_usernameArr(ii) := ii || 'TT';                

        END IF;

 

 

    END LOOP

 

END make_logincard_pro ;

 2.2JAVA调用存储过程make_logincard_pro:

 

 

//代码片段

Connection con = session.connection();

java.sql.CallableStatement cst = con

        prepareCall("call CNBT.test_pro(?,?,?)");

cst.setString(1, cardSuitCode);

cst.registerOutParameter(2, OracleTypes.ARRAY,"USERSEQID_ARRAY");

cst.registerOutParameter(3, OracleTypes.ARRAY,"USERNAME_ARRAY");

 

java.sql.Array userSeqIdArr = cst.getArray(2);

java.sql.Array userNameArr = cst.getArray(3);

 

if ( userSeqIdArr  != null ) ...{

    BigDecimal userSeqIdList[] = (BigDecimal[])userSeqIdArr.getArray();//数据库的number映射为BigDecimal

    //。。。。。。

}

if ( userNameArr  != null ) ...{

    String userNameList[] = (String[])userNameArr.getArray();

    //。。。。。。

}

 

 

 

 

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三. java调用输入参数为自定义数组的存储过程:

 

3.1 输入参数为自定义数组的存储过程update_logincard_pwd:

 

  /**//**********************************************

   *          update_logincard_pwd               *

   *功能描述:更新密码存储过程         *

   *输入参数:                                         *

   *输出参数:                                         *

   *作者:hanjiong                                    *

   ***********************************************/  

procedure update_logincard_pwd (

     p_userSeqIdList in USERSEQID_ARRAY,

     p_userPwdList in USERPWD_ARRAY,

     p_resultcode out number

   );

3.2 java调用存储过程update_logincard_pwd:

 

//代码片段

..........................

Connection con = session.connection();//使用的weblogic数据源

oracle.jdbc.OracleCallableStatement cst2 = (oracle.jdbc.OracleCallableStatement)con

                                    .prepareCall(

                                    "call CNBT.update_logincard_pwd(?,?,?)");

                            weblogic.jdbc.wrapper.Connection weblogicConn = (weblogic.jdbc.wrapper.Connection)con;

                            oracle.jdbc.OracleConnection oracleConn = (oracle.jdbc.OracleConnection)weblogicConn.getVendorConnection();//转化connection

                            oracle.sql.ArrayDescriptor des_USERSEQID_ARRAY =

                                    oracle.sql.ArrayDescriptor.createDescriptor("USERSEQID_ARRAY",oracleConn);

                            oracle.sql.ArrayDescriptor des_USERPWD_ARRAY =

                                    oracle.sql.ArrayDescriptor.createDescriptor("USERPWD_ARRAY",oracleConn);

                            oracle.sql.ARRAY ora_array1 = new oracle.sql.ARRAY(des_USERSEQID_ARRAY, oracleConn, userAccSeqIdArr);

                            oracle.sql.ARRAY ora_array2 = new oracle.sql.ARRAY(des_USERPWD_ARRAY, oracleConn, userPwdList);

                            cst2.setArray(1, ora_array1);

                            cst2.setArray(2, ora_array2);

                            cst2.registerOutParameter(3, java.sql.Types.INTEGER);

                            cst2.execute();

                            updateCode = cst2.getInt(3);

 

.....................................

....................................

因为我使用的是weblogic配置的数据源,在取得的connection对象时需要注意,通过数据源取得的Connection对象为weblogic.jdbc.wrapper.Connection,所以不能直接转化为oracle.jdbc.OracleConnection,否则会出现java.lang.ClassCastException异常,所以我们要通过weblogic.jdbc.wrapper.Connection.getVendorConnection()取得java.sql.Connection,在强制转化为oracle.jdbc.OracleConnection。

 

 

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通过上述两种情况,就可以在Oracle存储过程中使用zid

 

posted on 2015-07-27 19:25  linbl  阅读(1121)  评论(0编辑  收藏  举报