SQLite – Java

安装

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。

本站提供 sqlite-jdbc 3.7.2 版本下载，最新 sqlite-jdbc-(VERSION).jar 版本可以访问 https://github.com/xerial/sqlite-jdbc/releases 下载。
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。

连接数据库

下面的 Java 程序显示了如何连接到一个现有的数据库。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。

import java.sql.*;

public class SQLiteJDBC
{
  public static void main( String args[] )
  {
    Connection c = null;
    try {
      Class.forName(\"org.sqlite.JDBC\");
      c = DriverManager.getConnection(\"jdbc:sqlite:test.db\");
    } catch ( Exception e ) {
      System.err.println( e.getClass().getName() + \": \" + e.getMessage() );
      System.exit(0);
    }
    System.out.println(\"Opened database successfully\");
  }
}

现在，让我们来编译和运行上面的程序，在当前目录中创建我们的数据库 test.db。您可以根据需要改变路径。我们假设当前路径下可用的 JDBC 驱动程序的版本是 sqlite-jdbc-3.7.2.jar。

$javac SQLiteJDBC.java
$java -classpath \".:sqlite-jdbc-3.7.2.jar\" SQLiteJDBC
Open database successfully

如果您想要使用 Windows 机器，可以按照下列所示编译和运行您的代码：

$javac SQLiteJDBC.java
$java -classpath \".;sqlite-jdbc-3.7.2.jar\" SQLiteJDBC
Opened database successfully

创建表

下面的 Java 程序将用于在先前创建的数据库中创建一个表：

import java.sql.*;

public class SQLiteJDBC
{
  public static void main( String args[] )
  {
    Connection c = null;
    Statement stmt = null;
    try {
      Class.forName(\"org.sqlite.JDBC\");
      c = DriverManager.getConnection(\"jdbc:sqlite:test.db\");
      System.out.println(\"Opened database successfully\");

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

上述程序编译和执行时，它会在 test.db 中创建 COMPANY 表，最终文件列表如下所示：

-rw-r--r--. 1 root root 3201128 Jan 22 19:04 sqlite-jdbc-3.7.2.jar
-rw-r--r--. 1 root root    1506 May  8 05:43 SQLiteJDBC.class
-rw-r--r--. 1 root root     832 May  8 05:42 SQLiteJDBC.java
-rw-r--r--. 1 root root    3072 May  8 05:43 test.db

INSERT 操作

下面的 Java 代码显示了如何在上面创建的 COMPANY 表中创建记录：

import java.sql.*;

public class SQLiteJDBC
{
  public static void main( String args[] )
  {
    Connection c = null;
    Statement stmt = null;
    try {
      Class.forName(\"org.sqlite.JDBC\");
      c = DriverManager.getConnection(\"jdbc:sqlite:test.db\");
      c.setAutoCommit(false);
      System.out.println(\"Opened database successfully\");

      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);

      stmt.close();
      c.commit();
      c.close();
    } catch ( Exception e ) {
      System.err.println( e.getClass().getName() + \": \" + e.getMessage() );
      System.exit(0);
    }
    System.out.println(\"Records created successfully\");
  }
}

上述程序编译和执行时，它会在 COMPANY 表中创建给定记录，并会显示以下两行：

Opened database successfully
Records created successfully

SELECT 操作

下面的 Java 程序显示了如何从前面创建的 COMPANY 表中获取并显示记录：

import java.sql.*;

public class SQLiteJDBC
{
  public static void main( String args[] )
  {
    Connection c = null;
    Statement stmt = null;
    try {
      Class.forName(\"org.sqlite.JDBC\");
      c = DriverManager.getConnection(\"jdbc:sqlite:test.db\");
      c.setAutoCommit(false);
      System.out.println(\"Opened database successfully\");

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

上述程序编译和执行时，它会产生以下结果：

Opened database successfully
ID = 1
NAME = Paul
AGE = 32
ADDRESS = California
SALARY = 20000.0

ID = 2
NAME = Allen
AGE = 25
ADDRESS = Texas
SALARY = 15000.0

ID = 3
NAME = Teddy
AGE = 23
ADDRESS = Norway
SALARY = 20000.0

ID = 4
NAME = Mark
AGE = 25
ADDRESS = Rich-Mond
SALARY = 65000.0

Operation done successfully

UPDATE 操作

下面的 Java 代码显示了如何使用 UPDATE 语句来更新任何记录，然后从 COMPANY 表中获取并显示更新的记录：

import java.sql.*;

public class SQLiteJDBC
{
  public static void main( String args[] )
  {
    Connection c = null;
    Statement stmt = null;
    try {
      Class.forName(\"org.sqlite.JDBC\");
      c = DriverManager.getConnection(\"jdbc:sqlite:test.db\");
      c.setAutoCommit(false);
      System.out.println(\"Opened database successfully\");

      stmt = c.createStatement();
      String sql = \"UPDATE COMPANY set SALARY = 25000.00 where ID=1;\";
      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();
      stmt.close();
      c.close();
    } catch ( Exception e ) {
      System.err.println( e.getClass().getName() + \": \" + e.getMessage() );
      System.exit(0);
    }
    System.out.println(\"Operation done successfully\");
  }
}

上述程序编译和执行时，它会产生以下结果：

Opened database successfully
ID = 1
NAME = Paul
AGE = 32
ADDRESS = California
SALARY = 25000.0

ID = 2
NAME = Allen
AGE = 25
ADDRESS = Texas
SALARY = 15000.0

ID = 3
NAME = Teddy
AGE = 23
ADDRESS = Norway
SALARY = 20000.0

ID = 4
NAME = Mark
AGE = 25
ADDRESS = Rich-Mond
SALARY = 65000.0

Operation done successfully

DELETE 操作

下面的 Java 代码显示了如何使用 DELETE 语句删除任何记录，然后从 COMPANY 表中获取并显示剩余的记录：

import java.sql.*;

public class SQLiteJDBC
{
  public static void main( String args[] )
  {
    Connection c = null;
    Statement stmt = null;
    try {
      Class.forName(\"org.sqlite.JDBC\");
      c = DriverManager.getConnection(\"jdbc:sqlite:test.db\");
      c.setAutoCommit(false);
      System.out.println(\"Opened database successfully\");

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

上述程序编译和执行时，它会产生以下结果：

Opened database successfully
ID = 1
NAME = Paul
AGE = 32
ADDRESS = California
SALARY = 25000.0

ID = 3
NAME = Teddy
AGE = 23
ADDRESS = Norway
SALARY = 20000.0

ID = 4
NAME = Mark
AGE = 25
ADDRESS = Rich-Mond
SALARY = 65000.0

Operation done successfully

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SQLite – Java

安装

连接数据库

创建表

INSERT 操作

SELECT 操作

UPDATE 操作

DELETE 操作

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拓旁网 -- 专注于技术资源

SQLite – Java

安装

连接数据库

创建表

INSERT 操作

SELECT 操作

UPDATE 操作

DELETE 操作

0 篇笔记 写笔记

点我分享笔记

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