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