如何在JDBC中使用另一个表创建表？
您可以使用以下语法创建与现有表相同的表：
CREATE TABLE new_table as SELECT * from old_table;
假设我们有一个名为dispatchs的表，其中包含5条记录，如下所示：
+-------------+--------------+--------------+--------------+-------+----------------+ | ProductName | CustomerName | DispatchDate | DeliveryTime | Price | Location | +-------------+--------------+--------------+--------------+-------+----------------+ | Key-Board | Raja | 2019-09-01 | 05:30:00 | 7000 | Hyderabad | | Earphones | Roja | 2019-05-01 | 05:30:00 | 2000 | Vishakhapatnam | | Mouse | Puja | 2019-03-01 | 05:29:59 | 3000 | Vijayawada | | Mobile | Vanaja | 2019-03-01 | 04:40:52 | 9000 | Chennai | | Headset | Jalaja | 2019-04-06 | 18:38:59 | 6000 | Goa | +-------------+--------------+--------------+--------------+-------+----------------+
接下来的JDBC程序建立与数据库的连接，并使用现有表的定义创建一个新表。
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class CreateTable {
public static void main(String args[]) throws Exception{
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Creating the Statement object
Statement stmt = con.createStatement();
//Query to create a table
String query = "CREATE TABLE Sales as SELECT * from dispatches";
//Executing the query
stmt.execute(query);
System.out.println("Table created......");
}
}输出结果
Connection established...... Table created......
如果您验证“销售”表的内容，则可以观察到它与“分派”表相同。
select * from Sales; +-------------+--------------+--------------+--------------+-------+----------------+ | ProductName | CustomerName | DispatchDate | DeliveryTime | Price | Location | +-------------+--------------+--------------+--------------+-------+----------------+ | Key-Board | Raja | 2019-09-01 | 05:30:00 | 7000 | Hyderabad | | Earphones | Roja | 2019-05-01 | 05:30:00 | 2000 | Vishakhapatnam | | Mouse | Puja | 2019-03-01 | 05:29:59 | 3000 | Vijayawada | | Mobile | Vanaja | 2019-03-01 | 04:40:52 | 9000 | Chennai | | Headset | Jalaja | 2019-04-06 | 18:38:59 | 6000 | Goa | +-------------+--------------+--------------+--------------+-------+----------------+ 5 rows in set (0.00 sec)