详解Java使用sqlite数据库如何生成db文件

import java.sql.Connection; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
 
import javax.sql.DataSource; 
 
import org.apache.commons.dbcp2.BasicDataSource; 
import org.springframework.jdbc.datasource.DataSourceUtils; 
 
public class Main { 
 
  public static void update(String sql) { 
    DataSource data = getDataSource(); 
    Connection cOnn= null; 
    try { 
      cOnn= data.getConnection(); 
      PreparedStatement ps = conn.prepareStatement(sql); 
      ps.executeUpdate(); 
    } catch (Exception e) { 
      throw new RuntimeException(e.getMessage()); 
    } finally { 
      try { 
        DataSourceUtils.doCloseConnection(conn, dataSource); 
      } catch (Exception e) { 
      } 
    } 
  } 
 
  protected static BasicDataSource dataSource = null; 
 
  public static DataSource getDataSource() { 
    synchronized (Thread.class) { 
      if (null == dataSource) { 
        dataSource = new BasicDataSource(); 
        dataSource.setUrl("jdbc:sqlite:hp.db"); 
        dataSource.setDriverClassName("org.sqlite.JDBC"); 
      } 
    } 
    return dataSource; 
  } 
 
  public static void main(String[] args) throws Exception { 
    update("drop table if exists COMPANY"); 
    update("CREATE TABLE COMPANY (ID INT,cname VARCHAR(40))"); 
 
    for (int x = 0; x <300; x++) { 
      update("insert into COMPANY(id , cname) values(" + x + " ,'xx" + x + "')"); 
    } 
 
    PreparedStatement ps = getDataSource().getConnection().prepareStatement("select * from COMPANY"); 
    ResultSet rs = ps.executeQuery(); 
    while (rs.next()) { 
      System.out.println(rs.getString("id") + "--" + rs.getString("cname")); 
    } 
  } 
}