如何解决JDBC批处理INSERT,返回ID
我假设这是关于Oracle的。据我所知,这是不可能的,但是您可以FORALL
在匿名PL /SQL块中使用进行批量插入,如我最近写的这篇文章中所述:https://codingdict.com/blog/1619
这是本文中的一个自包含的JDBC示例,该示例插入值数组,然后将结果批量收集回JDBC客户端:
try (Connection con = DriverManager.getConnection(url, props);
Statement s = con.createStatement();
// The statement itself is much more simple as we can
// use OUT parameters to collect results into, so no
// auxiliary local variables and cursors are needed
CallableStatement c = con.prepareCall(
"DECLARE "
+ " v_j t_j := ?; "
+ "BEGIN "
+ " FORALL j IN 1 .. v_j.COUNT "
+ " INSERT INTO x (j) VALUES (v_j(j)) "
+ " RETURNING i, j, k "
+ " BULK COLLECT INTO ?, ?, ?; "
+ "END;")) {
try {
// Create the table and the auxiliary types
s.execute(
"CREATE TABLE x ("
+ " i INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,"
+ " j VARCHAR2(50),"
+ " k DATE DEFAULT SYSDATE"
+ ")");
s.execute("CREATE TYPE t_i AS TABLE OF NUMBER(38)");
s.execute("CREATE TYPE t_j AS TABLE OF VARCHAR2(50)");
s.execute("CREATE TYPE t_k AS TABLE OF DATE");
// Bind input and output arrays
c.setArray(1, ((OracleConnection) con).createARRAY(
"T_J", new String[] { "a", "b", "c" })
);
c.registerOutParameter(2, Types.ARRAY, "T_I");
c.registerOutParameter(3, Types.ARRAY, "T_J");
c.registerOutParameter(4, Types.ARRAY, "T_K");
// Execute, fetch, and display output arrays
c.execute();
Object[] i = (Object[]) c.getArray(2).getArray();
Object[] j = (Object[]) c.getArray(3).getArray();
Object[] k = (Object[]) c.getArray(4).getArray();
System.out.println(Arrays.asList(i));
System.out.println(Arrays.asList(j));
System.out.println(Arrays.asList(k));
}
finally {
try {
s.execute("DROP TYPE t_i");
s.execute("DROP TYPE t_j");
s.execute("DROP TYPE t_k");
s.execute("DROP TABLE x");
}
catch (SQLException ignore) {}
}
}
解决方法
有什么办法可以使用RETURNING INTO来获取受影响的行的值?我必须将相同的行插入x次并获取插入的行的ID。
查询如下所示:
public static final String QUERY_FOR_SAVE =
"DECLARE " +
" resultId NUMBER ; " +
"BEGIN " +
" INSERT INTO x " +
" (a,b,c,d,e,f,g,h,i,j,k,l,m) " +
" values (sequence.nextVal,:a,:b,:c,:d,:e,:f,:g,:h,:i,:j,:k,:l) " +
" RETURNING a INTO :resultId;" +
"END;";
现在我可以使用addBatch在JAVA循环中将此查询添加到批处理中
IntStream.range(0,count)
.forEach(index -> {
try {
setting parameters...
cs.addBatch();
} catch (SQLException e) {
e.printStackTrace();
}
});
cs.executeBatch();
有没有办法像这样从批处理中返回数组或列表?我可以仅使用sql来执行x次插入操作,但是在这种情况下,我还想知道如何返回ID数组。
提前致谢
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。