How to execute sql-script file in java?

Question

I want to execute sql script file in java without reading all file contents to the big query and executing it. Is there is any standard way?

Answer 1

No, you must read the file, split it into separate queries and then execute them individually (or using the batch API of JDBC).

One of the reasons is that every database defines their own way to separate SQL statements (some use ;, others /, some allow both or even to define your own separator).

Answer 2

JDBC does not support this option (although a specific DB driver may offer this). Anyway, there should not be a problem with loading all file contents into memory.

Answer 3

There is no portable way of doing that. You can execute a native client as an external program to do that though:

import java.io.*;
public class CmdExec {

  public static void main(String argv[]) {
    try {
      String line;
      Process p = Runtime.getRuntime().exec
        ("psql -U username -d dbname -h serverhost -f scripfile.sql");
      BufferedReader input =
        new BufferedReader
          (new InputStreamReader(p.getInputStream()));
      while ((line = input.readLine()) != null) {
        System.out.println(line);
      }
      input.close();
    }
    catch (Exception err) {
      err.printStackTrace();
    }
  }
}

• Code sample was extracted from here and modified to answer question assuming that the user wants to execute a PostgreSQL script file.

Answer 4

You cannot do using JDBC as it does not support . Work around would be including iBatis iBATIS is a persistence framework and call the Scriptrunner constructor as shown in iBatis documentation .

Its not good to include a heavy weight persistence framework like ibatis in order to run a simple sql scripts any ways which you can do using command line

$ mysql -u root -p db_name < test.sql

Answer 5

There is great way of executing SQL scripts from Java without reading them yourself as long as you don't mind having a runtime dependency on Ant. In my opinion such a dependency is very well justified in your case. Here is sample code, where SQLExec class lives in ant.jar:

private void executeSql(String sqlFilePath) {
    final class SqlExecuter extends SQLExec {
        public SqlExecuter() {
            Project project = new Project();
            project.init();
            setProject(project);
            setTaskType("sql");
            setTaskName("sql");
        }
    }

    SqlExecuter executer = new SqlExecuter();
    executer.setSrc(new File(sqlFilePath));
    executer.setDriver(args.getDriver());
    executer.setPassword(args.getPwd());
    executer.setUserid(args.getUser());
    executer.setUrl(args.getUrl());
    executer.execute();
}