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  • 向MySQL 中存储大文本数据

    package cn.itcast.demo;
    
    import java.io.File;
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.InputStreamReader;
    import java.io.Reader;
    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    
    import org.junit.Test;
    
    import cn.itcast.utils.JdbcUtils;
    
    public class Demo1 {
    
        /**
         
         create database day15;
         use day15;
         create table testclob
         (
             id int primary key auto_increment,
             resume text
         );
          
         */
        
        //向Mysql数据库 中存储大文本数据
    
        @Test
        public void add() {
            Connection conn = null;
            PreparedStatement st = null;
            ResultSet rs = null;
            
            try{
                conn = JdbcUtils.getConnection();
                String sql = "insert into testclob(resume) values(?)";
                st = conn.prepareStatement(sql);
                
                //Reader reader = new InputStreamReader(Demo1.class.getClassLoader().getResourceAsStream("1.txt"));
                String path  = Demo1.class.getClassLoader().getResource("1.txt").getPath();
                File file = new File(path);
                st.setCharacterStream(1, new FileReader(file), (int) file.length());
                int num = st.executeUpdate();
                if(num>0){
                    System.out.println("插入成功!!");
                }
            }catch (Exception e) {
                e.printStackTrace();
            }finally{
                JdbcUtils.release(conn, st, rs);
            }
        }
        
        @Test
        public void read(){
            Connection conn = null;
            PreparedStatement st = null;
            ResultSet rs = null;
            
            try{
                conn = JdbcUtils.getConnection();
                String sql = "select resume from testclob where id=1";
                st = conn.prepareStatement(sql);
                rs = st.executeQuery();
                if(rs.next()){
                    System.out.println("haha");
                    Reader reader = rs.getCharacterStream("resume");
                    char buffer[] = new char[1024];
                    int len = 0;
                    FileWriter out = new FileWriter("c:\1.txt");
                    while((len=reader.read(buffer))>0){
                        out.write(buffer, 0, len);
                    }
                    out.close();
                    reader.close();
                }
                
            }catch (Exception e) {
                e.printStackTrace();
            }finally{
                JdbcUtils.release(conn, st, rs);
            }
        }
        
        
    }
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  • 原文地址:https://www.cnblogs.com/lichone2010/p/3178666.html
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