sqlloader导入数据

适用场景:oracle数据库需要导入大量的数据，数据源来自txt文件。

Sqlloader.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

public class SqlLoad {
    //数据库配置信息
    private static String dbconnStr="bxw/root@ORCL";
    
    /** java运行dos命令将txt文件下的数据导入到oracle
     * 没有ctlfile
     * @param args
     */
    public void sqlldr (String infile,String tablename,String split_flag,String ctlfile){
        Runtime rt=Runtime.getRuntime();
        Process proc;    
        String ctl_path=createloadctl(infile,tablename,split_flag,ctlfile);    
        String log_path=ctl_path.substring(0,ctl_path.indexOf(".")+1)+"log";
        String cmdstr="sqlldr "+dbconnStr+" control="+ctl_path+" log="+log_path+" skip=1";
        System.out.println("cmd命令："+cmdstr);
        try{ 
            proc = rt.exec(cmdstr);
        }catch (Exception e) {
            System.out.println(" error while running sqlldr!");
        }
    }
    
    /**
     * 有ctlfile
     * @param ctl_path
     */
    public void sqlldr (String ctl_path){
        Runtime rt=Runtime.getRuntime();
        Process proc;
        String log_path=ctl_path.substring(0,ctl_path.indexOf(".")+1)+"log";
        String cmdstr="sqlldr "+dbconnStr+" control="+ctl_path+" log="+log_path+" skip=1";
        System.out.println("cmd命令："+cmdstr);
        try{
            proc = rt.exec(cmdstr);
        }catch (Exception e) {
            System.out.println(" error while running sqlldr!");
        }
    }
    
    /** 创建ctl文件
     * @param infile:有数据的txt文档
     * @param tablename：要导入的oracle数据表
     * @param split_flag:导入的数据以何种标志分割字段
     * @param ctl文件的最终存放路径
     */
    public String createloadctl(String infile,String tablename,String split_flag,String ctlfile){            
        if (tablename=="" || tablename==null){
            System.out.println("数据库名称不能为空！！");
        }
        
        if (ctlfile=="" || ctlfile==null){
            String path="F:\sqlloadTest\";
            ctlfile=path+"lc_sqlldr.ctl";
            System.out.println("路径："+ctlfile);
        }
        
        File out_file=new File(ctlfile);
        try {
            if (out_file.exists()){
                out_file.delete();
            }else{
                out_file.createNewFile();
            }
        }catch(Exception ex){
            ex.printStackTrace();
        }
        
        /*
         * 编写ctlfile的格式
         */
        StringBuffer sb = new StringBuffer();
        sb.append("load data");
        sb.append("
");
        sb.append("infile ");
        sb.append("'");
        sb.append(infile);
        sb.append("'");
        sb.append("
");
        sb.append("append into table ");
        sb.append(tablename);
        sb.append("
");
        sb.append("fields terminated by ");
        sb.append("'");
        sb.append(split_flag);
        sb.append("'");
        sb.append("
");
        sb.append("(id,name,price,author,pubishdate  DATE"YYYY-MM-DD HH24:MI:SS")");
        
        String sbstr=sb.toString();
        
        String ctlstr="load data"+"
"+
                "infile "+"'"+infile+"'"+"
"+
                "append into table "+tablename+"
"+
                "fields terminated by "+"'"+split_flag+"'"+"
"+
                "(id,name,price,author,pubishdate  DATE"YYYY-MM-DD HH24:MI:SS")";
        System.out.println(ctlstr);
        try{
            //将数据库数据写入指定的txt文件
            File file = new File(ctlfile);  //自定义文件路径
            OutputStreamWriter write;
            //write = new OutputStreamWriter(new FileOutputStream(file),"UTF-8");
            write = new OutputStreamWriter(new FileOutputStream(file));
            BufferedWriter writer = new java.io.BufferedWriter(write);
            writer.write(ctlstr);  // 输出流写入到文件中
            writer.close();
            write.close();
        }catch(UnsupportedEncodingException e){
            e.printStackTrace();
        }catch(FileNotFoundException e){
            e.printStackTrace();
        }catch(Exception ex){
            ex.printStackTrace();
        }
        
        return ctlfile;
    }
    
    public static void main(String[] args) {
        String infile="F:\sqlloadTest\data.txt";
        String tablename="book";
        String split_flag="|";
        String ctlfile="F:\sqlloadTest\lc_loader.ctl";
        SqlLoad loader=new SqlLoad();
        loader.sqlldr(infile, tablename, split_flag, ctlfile);
        //loader.sqlldr(ctlfile);
    }

}