[英]MariaDB: Enable Java Stored Procedure
我試圖弄清楚如何使用Java在MariaDB中編寫存儲過程。 周圍有一個補丁,說有可能。 我不確定這是否已成為標准。
如果您使用Java成功地為MariaDB / MySQL編寫了存儲過程,請告訴我。
我假設問題是關於使用Java作為存儲過程的語言,而不是SQL。 這是不可能的。 是的,安東尼·柯蒂斯做了一些工作,這將使這種存儲過程成為可能。 las,它不是MySQL / MariaDB或任何發行版的一部分。 因此,至少在現在,您將無法使用它。
Hej Martin,
我一個月前做了。 我使用了與MySQL數據庫的JDBC連接,但是MariaDB是Drop-in的替代品,因此我認為它也可以在MariaDB實例上使用。
這是我的工作示例代碼:
JDBCConnection類
package de.professional_webworkx.blog.sp.connector;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.mysql.jdbc.Driver;
public class JDBCConnector {
public static JDBCConnector INSTANCE;
/*
* We need some connection information
* CHANGE THEM!
*/
private static final String USER = "USER";
private static final String PASS = "PASS";
private static final String HOST = "localhost";
private static final String DB = "DATABASE";
private static final int PORT = 3306;
private static final String URL = "jdbc:mysql://"+HOST+":"+PORT+"/"+DB;
private Connection connection;
private java.sql.PreparedStatement statement;
private JDBCConnector() {
connect();
}
private void connect() {
try {
Driver driver = (Driver)Class.forName("com.mysql.jdbc.Driver").newInstance();
DriverManager.registerDriver(driver);
connection = DriverManager.getConnection(URL, USER, PASS);
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void closeConnection() {
if(connection != null) {
try {
connection.close();
} catch (SQLException e) {
System.err.println("Something went wrong while closing the connection");
}
}
}
public void getCustomerCount() {
try {
Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery("SELECT COUNT(*) FROM customer;");
while(rs != null && rs.next()){
System.out.println(rs.getInt(1));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void addStoredProcedure() {
try {
String sql = "create procedure myProc() "
+ "BEGIN "
+ "SELECT COUNT(*) as total FROM customer;"
+ "END";
statement = connection.prepareStatement(sql);
statement.execute();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static JDBCConnector getInstance() {
if(INSTANCE == null) {
INSTANCE = new JDBCConnector();
}
return INSTANCE;
}
}
並啟動它:
package de.professional_webworkx.blog.sp;
import de.professional_webworkx.blog.sp.connector.JDBCConnector;
public class App
{
public static void main( String[] args )
{
JDBCConnector connector = JDBCConnector.getInstance();
// create the Stored Procedure in your DB
connector.addStoredProcedure();
}
}
我還將此示例代碼推送到GitHub
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