Question

JAVA调用存储过程，Oracle自定义类型作参数怎么写法

Answer 1

1. 存储过程以及类型定义如下：

--The array in oracle
CREATE OR REPLACE TYPE idArray AS TABLE OF VARCHAR2(20);

--package header
CREATE OR REPLACE PACKAGE Lib_Package AS
PROCEDURE Book_Check_Procedure(ids IN idArray, exist OUT NUMBER);
END Lib_Package;

--package body
CREATE OR REPLACE PACKAGE BODY Lib_Package AS

PROCEDURE Book_Check_Procedure( ids IN idArray, exist OUT NUMBER) AS v_Index BINARY_INTEGER; BEGIN v_Index:= ids.FIRST; LOOP SELECT COUNT(*) INTO exist FROM Lib_Duplicate WHERE status='Lent' AND book_id=ids(v_Index); EXIT WHEN v_Index=ids.LAST OR exist>0; v_Index:= ids.NEXT(v_Index); END LOOP;END Book_Check_Procedure;
END Lib_Package;

2.在Java中调用上面的存储过程
(1) 在Oracle中定义数组类型idArray (2) 在java构造数组并转换成Oracle中定义的数组类型，调用存储过程

/** * 当要删除图书时，检查是否仍然有图书复本处于借出状态 */ public boolean checkBookStatus(String[] bookIds) throws DataAccessException {
boolean flag = false; Connection conn = null; OracleCallableStatement cstmt = null; ArrayDescriptor desc = null; ARRAY bookIdArray = null; int count = 0; String sql = "{call LIB_PACKAGE.Book_Check_Procedure(?,?)}";
DbDriverManager dbManager = DbDriverManager.getInstance(); conn = dbManager.getConnection(Constants.DATABASE);
try { cstmt = (OracleCallableStatement) conn.prepareCall(sql);
//定义oracle中的数组类型 desc = ArrayDescriptor.createDescriptor("IDARRAY", conn); bookIdArray = new ARRAY(desc, conn, bookIds);
cstmt.setObject(1, bookIdArray, oracle.jdbc.OracleTypes.ARRAY); cstmt.registerOutParameter(2, Types.INTEGER); cstmt.execute(); count = cstmt.getInt(2);
log.info(this.getClass() + ".checkBookStatus: count = " + count);
DbOperHelp.closeStatement(this.getClass(), cstmt); DbOperHelp.closeConnection(this.getClass(), conn); } catch (SQLException e) {
log.error(this.getClass() + ".checkBookStatus-->SQLException: " + e.getMessage()); DbOperHelp.closeStatement(this.getClass(), cstmt); DbOperHelp.closeConnection(this.getClass(), conn); throw new DataAccessException( "When check the books, there is a SQLException: " + e.getMessage(), e.getCause()); }
if (count > 0) {
flag = true; }
return flag; }