十句话说中国历史

在应用中，很多时候会对表的主键用一个自动增涨的数来付值，如Oracle的sequence，插入后又想得到的主键的值。下面介绍一下相关的方法。

1，用Oracle 的returning 语句。

PreparedStatement sta = conn.prepareStatement("INSERT INTO LOGGING VALUES (TESTSEQ.NEXTVAL,SYSDATE)returning id into ? ");

sta.execute();

ResultSet rset = sta.getResultSet();

while(rset.next())

{

intid = rset.getInt(1);

}

如果是既有传入值,又有返回值的话,应该:

PreparedStatement sta = conn.prepareStatement("BEGIN
INSERT INTO LOGGING VALUES

(TESTSEQ.NEXTVAL,? )returning id into ?; END; ");

sta = conn.prepareCall(sqlText);

sta .setString(1, srqID);

sta .registerOutParameter(2, Types.NUMERIC);

sta .execute();

return sta .getLong(2);

或者用oracle的 OraclePreparedStatement

String sql = "insert into test values(1,?) returning id into ?";

OraclePreparedStatement pstt = (OraclePreparedStatement) conn.prepareStatement(sql);

pstt.setString(1, "xxx");

pstt.registerReturnParameter(2, OracleTypes.INTEGER);

pstt.executeUpdate();

ResultSet rset = pstt.getReturnResultSet(); // rest is not null

while (rset.next()) {

int id = rset.getInt(1);

System.out.println("Insert returnning: " + id);

}

2,用JDBC的getGeneratedKeys，返回的是Oracle 的rowid.

PreparedStatement sta = conn.prepareStatement("INSERT INTO TESTTABLE VALUES (TESTSEQ.NEXTVAL,'aaaa')",Statement.RETURN_GENERATED_KEYS);

sta.execute();

System.out.println(sta.getGeneratedKeys());

ResultSet rest = sta.getGeneratedKeys();

rest.next();

//oracle rowid

System.out.println(rest.getString(1));