Question

我正在尝试使用JDBC将CSV文件加载到mysql 5.8中。我正在使用用于JDBC的Connector / J API。代码段如下所示。执行完此代码后，我想获取插入/更新的记录数。我该如何计算？我必须在Java程序中获取详细信息

import com.mysql.cj.jdbc.*;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

public class PricingSynch {

    String host = "localhost";
    String port = "3310";
    String userid = "pricing";
    String password = "pricing";
    String uploadDirectory = "C:\\\\ProgramData\\\\MySQL\\\\MySQL Server 5.7\\\\Uploads\\\\";
    //String uploadDirectory = null;
    String uploadFileExtension = ".csv";

    String baseQuery = "LOAD DATA  INFILE '"+ uploadDirectory +"{fileName}' REPLACE INTO TABLE prc.{dbTable} FIELDS TERMINATED BY ',' LINES TERMINATED BY \'\\n' IGNORE 1 LINES;" ;

        JdbcConnection conn = null;
        JdbcStatement stmt = null;
        ResultSet rs = null;

        public PricingSynch(String host, String port, String userid, String password, String folder) throws InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException {

            this.host = host;
            this.port = port;
            this.userid = userid;
            this.password = password;
            this.uploadDirectory = folder;
            dbConnection();
            runQueries(); 

        }

        private void runQueries() throws SQLException {
            Utils util = new Utils(uploadDirectory);
            String fileNames [] = util.getFiles();
            String dbTables [] = util.getTableNames();

            for (int i=0;i<fileNames.length;i++) {

                String sql = baseQuery.replace("{fileName}", fileNames[i]);
                sql = sql.replace("{dbTable}", dbTables[i]);
                System.out.println(sql);
                stmt.executeUpdate(sql);

                /*
                while(rs.next()) {

                System.out.println(rs.getString(1));
                System.out.println(rs.getString(2));
                }
                */
                //System.out.println(stmt.getUpdateCount());
                //System.out.println(stmt.);
                //System.out.println(rs.);
                //System.out.println(stmt.);
            }
        }

    public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException {
        // TODO Auto-generated method stub

        if (args.length == 0) {

            new PricingSynch("localhost", "3310", "root", "pricing", "C:\\ProgramData\\MySQL\\MySQL Server 5.7\\Uploads");
        }

        if (args.length == 4) {

            new PricingSynch(args[0], args[1], args[2], args[3], args[4]);
        }
    }

    private void dbConnection() throws InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException {

        Class.forName("com.mysql.cj.jdbc.Driver").newInstance();
        conn =(JdbcConnection) DriverManager.getConnection("jdbc:mysql://"+host+"/world?" +"user="+userid+"&password="+password);
        stmt = (JdbcStatement)conn.createStatement();
        //stmt.getGeneratedKeys().getMetaData();
    }
}

Answer 1

使用int affectedRows = stmt.executeUpdate();

使用JDBC Connector / J的MySQL“在文件中加载数据”

1 个答案: