Question

我尝试使用spring jdbc 3.0将byte []插入到oracle.sql.BLOB列中。我得到以下例外：

java.lang.ClassCastException: [B cannot be cast to oracle.sql.BLOB|
at oracle.jdbc.driver.OraclePreparedStatement.setObjectCritical(OraclePreparedStatement.java:8752)|
at oracle.jdbc.driver.OraclePreparedStatement.setObjectInternal(OraclePreparedStatement.java:8286)|
at oracle.jdbc.driver.OraclePreparedStatement.setObject(OraclePreparedStatement.java:8868)|
at oracle.jdbc.driver.OraclePreparedStatementWrapper.setObject(OraclePreparedStatementWrapper.java:240)|
at org.apache.commons.dbcp.DelegatingPreparedStatement.setObject(DelegatingPreparedStatement.java:166)|
at org.apache.commons.dbcp.DelegatingPreparedStatement.setObject(DelegatingPreparedStatement.java:166)|
at org.springframework.jdbc.core.StatementCreatorUtils.setValue(StatementCreatorUtils.java:356)|
at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValueInternal(StatementCreatorUtils.java:216)|
at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(StatementCreatorUtils.java:144)|
at org.springframework.jdbc.core.ArgTypePreparedStatementSetter.doSetValue(ArgTypePreparedStatementSetter.java:97)|
at org.springframework.jdbc.core.ArgTypePreparedStatementSetter.setValues(ArgTypePreparedStatementSetter.java:79)|
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:815)|
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:811)|
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:586)|at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:811)|
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:867)|
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:871)|
at org.springframework.jdbc.core.simple.AbstractJdbcInsert.executeInsertInternal(AbstractJdbcInsert.java:366)|
at org.springframework.jdbc.core.simple.AbstractJdbcInsert.doExecute(AbstractJdbcInsert.java:356)|
at org.springframework.jdbc.core.simple.SimpleJdbcInsert.execute(SimpleJdbcInsert.java:118)|
....

byte []是从ByteBuffer对象构造的。

byte[] byte_array = byte_buffer.array();

我也尝试插入一个java.sql.Blob类型，但这也有类似的例外：

java.lang.ClassCastException: javax.sql.rowset.serial.SerialBlob cannot be cast to oracle.sql.BLOB|
at oracle.jdbc.driver.OraclePreparedStatement.setObjectCritical(OraclePreparedStatement.java:8752)|
at oracle.jdbc.driver.OraclePreparedStatement.setObjectInternal(OraclePreparedStatement.java:8286)|
at oracle.jdbc.driver.OraclePreparedStatement.setObject(OraclePreparedStatement.java:8868)|
at oracle.jdbc.driver.OraclePreparedStatementWrapper.setObject(OraclePreparedStatementWrapper.java:240)|
at org.apache.commons.dbcp.DelegatingPreparedStatement.setObject(DelegatingPreparedStatement.java:166)|
at org.apache.commons.dbcp.DelegatingPreparedStatement.setObject(DelegatingPreparedStatement.java:166)|
at org.springframework.jdbc.core.StatementCreatorUtils.setValue(StatementCreatorUtils.java:356)|
at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValueInternal(StatementCreatorUtils.java:216)|
at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(StatementCreatorUtils.java:144)
....

java.sql.Blob也是从ByteBuffer对象创建的。

Blob blob = new SerialBlob(byte_buffer.array());

看起来StatementCreatorUtils不像处理CLOB或NCLOB那样处理java.sql.Blob。有解决办法吗？或者我应该使用不同的java sql类型？

Answer 1

让类型为BINARY而不是BLOB（Types.BINARY）

我用这种方式成功执行

Answer 2

你可能想看一下Spring的SqlLobValue。将byte[]值附加到查询参数映射中，如下所示：

MapSqlParameterSource params = new MapSqlParameterSource();
params.addValue("blobParam", new SqlLobValue(byteArrayValue, lobHandler), Types.BLOB);

其中lobHandler是LobHandler bean（即org.springframework.jdbc.support.lob.DefaultLobHandler）。

Spring jdbc异常：B无法强制转换为oracle.sql.BLOB

2 个答案: