Caused by: org.apache.derby.client.am.SqlException: 尝试修改标识列“SRV_ID”。
at org.apache.derby.client.am.Statement.completeSqlca(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.parsePrepareError(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.parsePRPSQLSTTreply(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.readPrepareDescribeOutput(Unknown Source)
at org.apache.derby.client.net.StatementReply.readPrepareDescribeOutput(Unknown Source)
at org.apache.derby.client.net.NetStatement.readPrepareDescribeOutput_(Unknown Source)
at org.apache.derby.client.am.Statement.readPrepareDescribeOutput(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.readPrepareDescribeInputOutput(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.flowPrepareDescribeInputOutput(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.prepare(Unknown Source)
at org.apache.derby.client.am.Connection.prepareStatementX(Unknown Source)
... 90 more
问题描述：在setId后保存po时，报“尝试修改标识列”的异常
原因：主键设置了自增长
ij> CONNECT 'jdbc:derby://localhost:1527/practice;user=practice;password=practic
e';
ij> describe DEPARTMENT1;
COLUMN_NAME |TYPE_NAME|DEC&|NUM&|COLUM&|COLUMN_DEF|CHAR_OCTE&|IS_NULL&
------------------------------------------------------------------------------
ID |BIGINT |0 |10 |19 |AUTOINCRE&|NULL |NO
DEPARTMENTNAME |VARCHAR |NULL|NULL|255 |NULL |510 |YES
2 rows selected
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