Oracle 在没有结果集的情况下使用JDBCSpring读取BLOB
我有一个在输出参数中返回BLOB的Oracle存储过程:Oracle 在没有结果集的情况下使用JDBCSpring读取BLOB,oracle,jdbc,spring-jdbc,Oracle,Jdbc,Spring Jdbc,我有一个在输出参数中返回BLOB的Oracle存储过程: PROCEDURE GET_IMAGE_DATA(i_image_type IN NUMBER, o_image_data OUT BLOB) IS BEGIN SELECT IMAGE_DATA INTO o_image_data FROM IMAGES WHERE IMAGE_TYPE = i_image_type; END GET_IMAGE_DATA;
PROCEDURE GET_IMAGE_DATA(i_image_type IN NUMBER, o_image_data OUT BLOB) IS
BEGIN
SELECT IMAGE_DATA
INTO o_image_data
FROM IMAGES
WHERE IMAGE_TYPE = i_image_type;
END GET_IMAGE_DATA;
我想使用JDBCSpring来读取这些数据。但是,DefaultLobHandler(我认为OracleLobHandler)getBlobAsBytes()需要一个结果集
private static class QueryForBinaryCryptKey extends StoredProcedure {
private static final String SQL = "IMAGE_PKG.GET_IMAGE_DATA";
private DefaultLobHandler lobHandler;
QueryForImageData(DataSource dataSource) {
super(dataSource, SQL);
setFunction(false);
lobHandler = new DefaultLobHandler();
declareParameter(new SqlParameter(KEY_TYPE, OracleTypes.NUMBER));
declareParameter(new SqlOutParameter(KEY_BLOB, OracleTypes.BLOB));
}
public Map getImage(int keyType) {
Map outParams = super.execute(inParams(keyType));
//how can I get the contents of the blob right here since
//getBlobAsBytes requires a resultSet???
return outParams;
}
private Map inParams(int keyType) {
Map params = new HashMap();
params.put(KEY_TYPE, new Integer(keyType));
return params;
}
}
当我只有一个out参数而不是resultset时,如何获取blob数据?JDBC Spring API(and)要求为其blob相关方法提供一个对象
您需要将获取图像\u数据
过程转换为函数:
FUNCTION ATTACHMENT_BLOB_GET(IN_IMAGE_TYPE IN IMAGES.IMAGE_TYPE%TYPE)
RETURN SYS_REFCURSOR AS
results_cursor SYS_REFCURSOR;
BEGIN
OPEN results_cursor FOR
SELECT t.image_data
FROM IMAGES t
WHERE t.image_type = IN_IMAGE_TYPE;
RETURN results_cursor;
END;
OUT参数对于某些BLOB来说总是很好的,尤其是BLOB。JDBCSpringAPI(和)需要一个对象来实现与BLOB相关的方法
您需要将获取图像\u数据
过程转换为函数:
FUNCTION ATTACHMENT_BLOB_GET(IN_IMAGE_TYPE IN IMAGES.IMAGE_TYPE%TYPE)
RETURN SYS_REFCURSOR AS
results_cursor SYS_REFCURSOR;
BEGIN
OPEN results_cursor FOR
SELECT t.image_data
FROM IMAGES t
WHERE t.image_type = IN_IMAGE_TYPE;
RETURN results_cursor;
END;
OUT参数总是适合一些悲伤,尤其是Blob。确实可以将Blob读取为Stream/byte[],而无需结果集。检查一个。确实可以在没有结果集的情况下将Blob读取为Stream/byte[]。检查一个