java - 如何管理数百个插入？

Question

当我们无法更改游标数时，避免 ORA-0100: Maximum open cursors exceeded 的最佳方法是什么？

有没有更好的方法:

Connection connection = DriverManager.getConnection(/* Oracle Driver */);
Statement st = null;
  st = connection.createStatement();
for (/* a lot of iteration with counter */) {

  st.executeUpdate(insertSql);

  if ( counter % 500 == 0) {
    st.close();
    connection.commit();
    st = connection.createStatement();
  }
}

哪个方法调用使用游标:executeUpdate 还是 createStatement？
我认为这是 executeUpdate 方法，这就是我制作此计数器的原因。

对于我工作的 Oracle:

select * from v$version;

结果:

BANNER
----------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

Answer 1

您仅在每 50 个声明中关闭...

for (/* a lot of iteration with counter */) {
  st = connection.createStatement(); //you create a statement each iteration!

  //...

  // This whole thing not right here
  if ( counter % 50 == 0) {
    st.close(); // not right here -- will have 49 open statements by now
    connection.commit(); //this too
  }

}

对于这种数据量，您应该使用准备好的语句和批量插入。

 PreparedStatement statement = connection.prepareStatement(insertTableSQL);
 for(<the objects you have>) {

   //set parameters into insert query
   statement.set*.*(1, <paramValue>);

   statement.addBatch(); //add it to the batch
 }

 statement.executeBatch();//execute whole batch
 connection.commit();