在 Java 中将 CSV 导入 SQLite

Question

我开始学习 Java，需要一些帮助。我需要将 CSV 文件导入 SQLite 数据库。我有这个 CSV 阅读器，但我不知道如何将这些数据复制到 SQLite 数据库中。

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class csv {
        public static void main(String[] args) {
        String csvFile = "/home/user/user.csv";
        BufferedReader br = null;
        String line = "";
        String cvsSplitBy = ",";

        try {

            br = new BufferedReader(new FileReader(csvFile));
            while ((line = br.readLine()) != null) {

                String[] table = line.split(cvsSplitBy);
                  }
            } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

}

Answer 1

您可以使用 JDBC 和预处理语句（查看此文档 https://docs.oracle.com/javase/8/docs/api/index.html?java/sql/PreparedStatement.html）

1. 为 SQLite 下载一些 JDBC 驱动程序。比如这里https://github.com/xerial/sqlite-jdbc

2. 将 JDBC jar 添加到您的类路径。

3. 这样写：

   String dbName = "insert your db name here";
   Connection conn = null;
   try {
       // use your dbname instead
       conn = DriverManager.getConnection("jdbc:sqlite:dbname");
       // use your tablename instead; set as much question marks as many fields you have
       PreparedStatement stmt =
           conn.prepareStatement("insert into tablename (column1, column2, column3) values (?, ?, ?)");
       br = ...;
       while (line = ...) {
           String[] table = ...;
           // set values to replace question marks in prepared statement
           stmt.setInt(1, table[0]);
           stmt.setString(2, table[1]);
           stmt.setString(3, table[2]);
           // so, know your statement is like insert into ... values (table[0], table[1], table[2])
           // and maybe add other fields...
           stmt.executeUpdate(); // insert data into table
       }
   } catch (...) { ...
   } finally { ...close conn and br... }
   

Answer 2

如果您的循环保持这样，您必须遍历数组的每一行并选择值并将它们写入您的数据库。要将数据写入 sqlite 数据库，您应该使用 google。你会发现很多关于如何做到这一点的例子