Java如何调用返回结果集的存储过程？
本示例说明如何调用存储过程，该存储过程返回查询执行结果的结果集。
package org.nhooo.example.jdbc;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
public class CallableStatementExample {
private static final String URL = "jdbc:mysql://localhost/nhooo";
private static final String USERNAME = "root";
private static final String PASSWORD = "";
public static void main(String[] args) {
try (Connection connection =
DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
//准备调用sored过程。此SP需要
//一个IN参数
String query = "call GetProductByPrice(?)";
CallableStatement cb = connection.prepareCall(query);
//设置输入参数
cb.setDouble(1, 40d);
//执行查询
ResultSet rs = cb.executeQuery();
while (rs.next()) {
System.out.println("Product: " + rs.getString(1));
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}这是我们在上面的示例中使用的存储过程脚本。
DELIMITER ;;
DROP PROCEDURE IF EXISTS GetProductByPrice;;
CREATE PROCEDURE GetProductByPrice(IN product_price DECIMAL)
BEGIN
SELECT name FROM products WHERE price = product_price;
END;;
DELIMITER ;Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/8.0.17/mysql-connector-java-8.0.17.jar -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>