SQLite

来源：互联网发布：url短网址生成 java 编辑：程序博客网时间：2024/06/07 08:05

     在 Java 程序中使用 SQLite 之前，我们需要确保机器上已经有 SQLite JDBC Driver 驱动程序和 Java。可以查看 Java 教程了解如何在计算机上安装 Java。现在，我们来看看如何在机器上安装 SQLite JDBC 驱动程序。

    从 sqlite-jdbc库下载 sqlite-jdbc-(VERSION).jar 的最新版本。

    在您的 class 路径中添加下载的 jar 文件 sqlite-jdbc-(VERSION).jar，或者在 -classpath 选项中使用它，这将在后面的实例中进行讲解。

在学习下面部分的知识之前，您必须对 Java JDBC 概念有初步了解。如果您还未了解相关知识，那么建议您可以先花半个小时学习下 JDBC 教程相关知识，这将有助于您学习接下来讲解的知识。

package sqliteDemo;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class sqliteTest {

   private static Connection c = null;
   private static Statement stmt = null;

   /**
   * @param args
   */
   public static void main(String[] args) {
        try {
          Class.forName("org.sqlite.JDBC");
          c = DriverManager.getConnection("jdbc:sqlite:test.db");//如果数据库不存在，那么它就会被创建，最后将返回一个数据库对象。
          System.out.println("Opened database successfully");
          createdTable();
          //insert();
          //select();
          //update();
          //delete();

          stmt.close();
          c.close();
        } catch ( Exception e ) {
          System.err.println( e.getClass().getName() + ": " + e.getMessage() );
          System.exit(0);
        }

   }


   public static void createdTable() throws SQLException{
          stmt = c.createStatement();
          String sql = "CREATE TABLE COMPANY " +
                       "(ID INT PRIMARY KEY     NOT NULL," +
                       " NAME           TEXT    NOT NULL, " +
                       " AGE            INT     NOT NULL, " +
                       " ADDRESS        CHAR(50), " +
                       " SALARY         REAL)";
          stmt.executeUpdate(sql);
          System.out.println("Table created successfully");
   }


   public static void insert() throws SQLException{
          c.setAutoCommit(false);
          stmt = c.createStatement();
          String sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " +
                       "VALUES (1, 'Paul', 32, 'California', 20000.00 );";
          stmt.executeUpdate(sql);

          sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " +
                "VALUES (2, 'Allen', 25, 'Texas', 15000.00 );";
          stmt.executeUpdate(sql);

          sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " +
                "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );";
          stmt.executeUpdate(sql);

          sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " +
                "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";
          stmt.executeUpdate(sql);
          c.commit();
          stmt.close();
          System.out.println("Insert successfully");
   }


   public static void select() throws SQLException{
          c.setAutoCommit(false);
          stmt = c.createStatement();
          ResultSet rs = stmt.executeQuery( "SELECT * FROM COMPANY;" );
          while ( rs.next() ) {
             int id = rs.getInt("id");
             String name = rs.getString("name");
             int age = rs.getInt("age");
             String address = rs.getString("address");
             float salary = rs.getFloat("salary");
             System.out.print( "ID = " + id );
             System.out.print( "NAME = " + name );
             System.out.print( "AGE = " + age );
             System.out.print( "ADDRESS = " + address );
             System.out.println( "SALARY = " + salary );
          }
          rs.close();
   }


   public static void update() throws SQLException{
          c.setAutoCommit(false);
          stmt = c.createStatement();
          String sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=2;";
          stmt.executeUpdate(sql);
          c.commit();

          ResultSet rs = stmt.executeQuery( "SELECT * FROM COMPANY;" );
          while ( rs.next() ) {
             int id = rs.getInt("id");
             String name = rs.getString("name");
             int age = rs.getInt("age");
             String address = rs.getString("address");
             float salary = rs.getFloat("salary");
             System.out.print( "ID = " + id );
             System.out.print( "NAME = " + name );
             System.out.print( "AGE = " + age );
             System.out.print( "ADDRESS = " + address );
             System.out.println( "SALARY = " + salary );
          }
          rs.close();

   }

   public static void delete() throws SQLException{
          c.setAutoCommit(false);
          stmt = c.createStatement();
          String sql = "DELETE from COMPANY where ID=2;";
          stmt.executeUpdate(sql);
          c.commit();

          ResultSet rs = stmt.executeQuery( "SELECT * FROM COMPANY;" );
          while ( rs.next() ) {
             int id = rs.getInt("id");
             String name = rs.getString("name");
             int age = rs.getInt("age");
             String address = rs.getString("address");
             float salary = rs.getFloat("salary");
             System.out.println( "ID = " + id );
             System.out.println( "NAME = " + name );
             System.out.println( "AGE = " + age );
             System.out.println( "ADDRESS = " + address );
             System.out.println( "SALARY = " + salary );
             System.out.println();
          }
          rs.close();
   }
}

0 0