时间戳

首页 > 解决方案 > 如何在不使用 INSERT INTO SELECT 语句的情况下实现该程序以导入表？

java - 如何在不使用 INSERT INTO SELECT 语句的情况下实现该程序以导入表？

问题描述

目前导入/插入过程运行良好。但是我不想为插入和选择编写一个查询，而是编写一个单独的查询来从“snomed_descriptiondata”表中选择，并编写一个单独的查询来插入到“snomedinfo”_data 表中。

我当前的代码：

package Snomed.Snomed;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;

import catalog.Root;

public class Snomedinfo {
  public void snomedinfoinsert()
    {
    Root oRoot = null;
    ResultSet oRsSelect = null;
    PreparedStatement oPrStmt = null;
    PreparedStatement oPrStmt2 = null;
    PreparedStatement oPrStmtSelect = null;
    String strSql = null;
    String strSql2 = null;
    String snomedcode=null;
    ResultSet oRs = null;
    String refid = null;
    String id = null;
    String effectivetime = null;
    String active = null;
    String moduleid = null;
    String conceptid = null;
    String languagecode = null;
    String typeid = null;
    String term = null;
    String caseSignificanceid = null;
    int count = 0;
    final int batchSize = 1000;
    try{
    oRoot = Root.createDbConnection(null);
    strSql = "SELECT  id FROM snomed_conceptdata WHERE active=1 ";
    oPrStmt2 = oRoot.con.prepareStatement(strSql);
    oRsSelect = oPrStmt2.executeQuery();
    String sql = "INSERT INTO snomedinfo_data (refid,id,effectivetime,active,moduleid,conceptid,languagecode,typeid,term,caseSignificanceid)SELECT refid,id,effectivetime,active,moduleid,conceptid,languagecode,typeid,term,caseSignificanceid from snomed_descriptiondata WHERE conceptid =? AND active=1" ; 
    oPrStmtSelect = oRoot.con.prepareStatement(sql);
    while (oRsSelect.next()) {
        snomedcode = Root.TrimString(oRsSelect.getString("id"));
        //String sql = "INSERT INTO snomedinfo_data (refid,id,effectivetime,active,moduleid,conceptid,languagecode,typeid,term,caseSignificanceid)SELECT refid,id,effectivetime,active,moduleid,conceptid,languagecode,typeid,term,caseSignificanceid from snomed_descriptiondata WHERE conceptid =? AND active=1" ; 
        //oPrStmtSelect = oRoot.con.prepareStatement(sql);
        oPrStmtSelect.setString(1,snomedcode);

        oPrStmtSelect.executeUpdate();                 
        }

    //oPrStmtSelect.executeBatch();
    System.out.println("done");
    }

    catch (Exception e) {
        e.printStackTrace();
    }

    finally {
        oRsSelect = Root.EcwCloseResultSet(oRsSelect);
        oRs = Root.EcwCloseResultSet(oRs);
        oPrStmt = Root.EcwClosePreparedStatement(oPrStmt);
        oPrStmt = Root.EcwClosePreparedStatement(oPrStmt2);
        oPrStmt = Root.EcwClosePreparedStatement(oPrStmtSelect);
        oRoot = Root.closeDbConnection(null, oRoot);
    }
}
    public static void main(String args[] ) throws Exception 
      { 
      Snomedinfo a = new Snomedinfo();
      a .snomedinfoinsert();
      }
}

注意：如何在不使用嵌套 while 循环的情况下执行此操作？有人可以为我提供符合我的程序的解决方案吗？

标签： javamysqlsqljdbc

解决方案

IN您可以（并且应该）在子句中包含 concept-id-selecting 查询：

INSERT INTO snomedinfo_data (refid, id, effectivetime, active, moduleid, conceptid, 
                             languagecode, typeid, term, caseSignificanceid) 
    SELECT refid, id, effectivetime, active, moduleid, conceptid, 
                    languagecode, typeid, term, caseSignificanceid 
           FROM snomed_descriptiondata 
           WHERE active = 1 AND conceptid IN 
               (SELECT cd.id FROM snomed_conceptdata cd WHERE cd.active = 1)

这样，您应该能够在一个语句中完成所有操作，这将比 JDBC 驱动程序逐行（又名慢速）处理相同的数据快几个数量级。

推荐阅读