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)
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