如何使用 JDBC 将数据从文件复制到 PostgreSQL? [英] how to copy data from file to PostgreSQL using JDBC?

问题描述

我想使用 JDBC 将数据从文件复制到 PostgreSQL DB.我正在使用 JDBC 语句对象将文件复制到数据库中.很慢.

I want to copy data from file to PostgreSQL DB using JDBC. I was using JDBC statement object to copy the file into DB. It is very slow.

我开始知道我们也可以使用 copy out 命令将文件复制到数据库.但是，我怎么能用 JDBC 做到这一点.即使是在 JDBC 中提供复制示例的良好参考材料也会有所帮助.

I came to know that we can also use copy out command to copy file to DB. But, how can I do that with JDBC. Even good reference material having an example of copy in JDBC would help.

PS:提前致谢

推荐答案

这有效...

import java.io.FileReader;
import java.sql.Connection;
import java.sql.DriverManager;

import org.postgresql.copy.CopyManager;
import org.postgresql.core.BaseConnection;

public class PgSqlJdbcCopyStreamsExample {

    public static void main(String[] args) throws Exception {

        if(args.length!=4) {
            System.out.println("Please specify database URL, user, password and file on the command line.");
            System.out.println("Like this: jdbc:postgresql://localhost:5432/test test password file");
        } else {

            System.err.println("Loading driver");
            Class.forName("org.postgresql.Driver");

            System.err.println("Connecting to " + args[0]);
            Connection con = DriverManager.getConnection(args[0],args[1],args[2]);

            System.err.println("Copying text data rows from stdin");

            CopyManager copyManager = new CopyManager((BaseConnection) con);

            FileReader fileReader = new FileReader(args[3]);
            copyManager.copyIn("COPY t FROM STDIN", fileReader );

            System.err.println("Done.");
        }
    }
}

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