Java - Storing SQL statements in an external file [closed]

Answer 1

A simple solution we have implemented when faced with this was to externalize the SQL/DML into a file (mySql.properties), then use MessageFormat.format(String[] args) to inject dynamic properties into the SQL.

For example: mySql.properties:

select    *
    from      scott.emp
              join scott.dept on (emp.deptno = dept.deptno)
    where     emp.ename = {0}

Utility methods:

public static String format(String template, Object[] args) {
    String cleanedTemplate = replaceSingleQuotes(template);
    MessageFormat mf = new MessageFormat(cleanedTemplate);
    String output = mf.format(args);
    return output;
}
private static String replaceSingleQuotes(String template) {
    String cleaned = template.replace("'", "''");
    return cleaned;
}

Then use it like so:

String sqlString = youStringReaderImpl("/path/to/file");
String parsedSql = format(sqlString, new String[] {"bob"});