1，通过命令行使用.dump来备份成sql文件的方式
命令语句：
C:/sqlite/sqlite3 tim.db .dump >test.sql
.dump ?TABLE? ... Dump the database in an SQL text format
If TABLE specified, only dump tables matching
LIKE pattern TABLE.
执行效果如下图所示，可以看到备份的sql文件内容：
2，通过.read 语句来恢复数据库
命令语句：
C:/sqlite/sqlite3 tim2.db “.read c:/sqlite/test.sql
.read FILENAME Execute SQL in FILENAME
执行效果如下图所示：
3，通过java代码实现对sqlite数据库的备份恢复操作
Java代码如下：
- import java.io.*;
- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.sql.Statement;
-
- public class SqlitBackup {
- public String db_source=\"jdbc:sqlite://c:/sqlite/tim.db\";
- public String backup_file=\"c:/sqlite/alldbbackup.sql\";
- public static Connection conn = null;
- public static Statement stat = null;
-
- /**
- * 构造函数初始化数据源*/
- public SqlitBackup() {
- // TODO Auto-generated constructor stub
- try {
- Class.forName(\"org.sqlite.JDBC\");
- conn = DriverManager.getConnection(db_source);
- stat = conn.createStatement();
-
- } catch (Exception e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
-
- public static void main(String[] args) throws SQLException, IOException, ClassNotFoundException {
- // TODO Auto-generated method stub
- SqlitBackup sqlite =new SqlitBackup();
- // 1 ，录入初始化数据
- sqlite.init_data();
-
- // 2，开始备份
- sqlite.backup();
-
- // 3，删除原有的数据
- sqlite.dropDb();
-
- // 4，通过备份文件恢复数据
- sqlite.restore();
-
- // 5，关闭连接和数据源
-
- stat.close();
- conn.close();
- }
-
-
-
- /*
- * 恢复sqlite数据库**/
- private void restore() throws IOException, SQLException, ClassNotFoundException{
- Runtime rt = Runtime.getRuntime();
- String cmd=\"c:/sqlite/sqlite3 c:/sqlite/tim.db \\\".read \"+backup_file+\"\\\"\";
- Process process = rt.exec( cmd);
- Class.forName(\"org.sqlite.JDBC\");
- conn = DriverManager.getConnection(db_source);
- stat = conn.createStatement();
- ResultSet rs2 = stat.executeQuery(\"select * from sqlite_master;\"); // 查询数据
- System.out.println(\"4，数据已经恢复数据操作演示：\");
- while (rs2.next()) { // 将查询到的数据打印出来
- System.out.print(\"tbl_name = \" + rs2.getString(\"tbl_name\") + \", \"); // 列属性一
- }
- rs2.close();
- }
-
-
- /*
- * 删除表**/
- private void dropDb (){
- try {
- stat.executeUpdate(\"DROP TABLE IF EXISTS COMPANY; \");
- stat.executeUpdate(\"DROP TABLE IF EXISTS t1; \");
- System.out.println(\"3，表已经删除成功\");
-
- } catch (SQLException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
-
- }
-
- /*
- * 备份sqlite数据库*/
- private void backup() throws SQLException, IOException{
- Runtime rt = Runtime.getRuntime();
- String cmd=\"c:/sqlite/sqlite3 c:/sqlite/tim.db .dump\";
- Process process = rt.exec( cmd);
- try{
- InputStream in = process.getInputStream();// 控制台的输出信息作为输入流
- InputStreamReader xx = new InputStreamReader(in, \"utf-8\");
- // 设置输出流编码为utf-8。这里必须是utf-8，否则从流中读入的是乱码
- String inStr;
- StringBuffer sb = new StringBuffer(\"\");
- String outStr = null;
- // 组合控制台输出信息字符串
- BufferedReader br = new BufferedReader(xx);
- while ((inStr = br.readLine()) != null) {
- sb.append(inStr + \"\\r\\n\");
- }
- outStr = sb.toString();
- System.out.println();
- System.out.println(\"2，备份出来的sql文件内容是,outStr:\\r\"+outStr);
-
- // 要用来做导入用的sql目标文件：
- FileOutputStream fout = new FileOutputStream(backup_file);
- OutputStreamWriter writer = new OutputStreamWriter(fout, \"utf-8\");
- writer.write(outStr);
- writer.flush();
- in.close();
- xx.close();
- br.close();
- writer.close();
- fout.close();
- } catch (Exception e) {
- e.printStackTrace();
- }
-
-
- }
-
-
- private void init_data(){
- /*初始化建立2张表，录入测试数据*/
- try {
- // System.out.println(init_sql1);
- stat.executeUpdate(\"DROP TABLE IF EXISTS COMPANY; \");
- stat.executeUpdate(\"CREATE TABLE COMPANY(ID INT NOT NULL, NAME VARCHAR(20),AGE INT,ADDRESS VARCHAR(20),SALARY DECIMAL(7,2));\");
- stat.executeUpdate(\"INSERT INTO COMPANY VALUES(2,\‘Allen\‘,25,\‘Texas\‘,15000);\");
- stat.executeUpdate(\"INSERT INTO COMPANY VALUES(3,\‘Teddy\‘,23,\‘Norway\‘,20000); \");
-
- stat.executeUpdate(\"DROP TABLE IF EXISTS t1; \");
- stat.executeUpdate(\"CREATE TABLE t1(id int);\");
- stat.executeUpdate(\"INSERT INTO t1 VALUES(1);\");
- stat.executeUpdate(\"INSERT INTO t1 VALUES(2);\");
-
- // stat.executeUpdate(init_sql1);
- ResultSet rs = stat.executeQuery(\"select * from COMPANY;\"); // 查询数据
- System.out.println(\"1，初始化创建表结构录入数据操作演示：\");
- while (rs.next()) { // 将查询到的数据打印出来
- System.out.print(\"name = \" + rs.getString(\"name\") + \", \"); // 列属性一
- System.out.println(\"salary = \" + rs.getString(\"salary\")); // 列属性二
-
- }
- rs.close();
- } catch (SQLException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
-
-
- }
-
- }
执行结果如下：
(1)，初始化创建表结构录入数据操作演示：
name = Allen, salary = 15000
name = Teddy, salary = 20000
(2)，备份出来的sql文件内容是,outStr:
PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATE TABLE COMPANY(ID INT NOT NULL, NAME VARCHAR(20),AGE INT,ADDRESS VARCHAR(20),SALARY DECIMAL(7,2));
INSERT INTO "COMPANY" VALUES(2,‘Allen‘,25,‘Texas‘,15000);
INSERT INTO "COMPANY" VALUES(3,‘Teddy‘,23,‘Norway‘,20000);
CREATE TABLE t1(id int);
INSERT INTO "t1" VALUES(1);
INSERT INTO "t1" VALUES(2);
COMMIT;
(3)，表已经删除成功
(4)，数据已经恢复数据操作演示：
name = Allen, salary = 15000
name = Teddy, salary = 20000
时间： 2024-10-13 12:40:07