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SQL parser library for Java
I would like to use ready solution for parsing SQL file. File can contain comments, SQL statements, DDL. I need to get comments, all SQL statements. Doesn anyone know ready solution? I wouldn't like to ivent one more square wheel..
P.S. Please pay atttention that I don't need to ignore comments, I need to get text from comments in file
For what it's worth, I'd recommend that you look at iBatis, which IMHO, makes handwritten DAOs and DTOs with JDBC completely obsolete.
Before iBatis I use to keep my SQL in a separate SQL file and retrieved the correct SQL when I needed it. I don't use it anymore... since this is only marginally better than SQL in the actual Java code.
The syntax of the SQL file is as follows:
-- I added comments like this... [id] { any SQL statement... (quite frankly any text). } [id2] { ... } ... Then, a simple Parser class of the following:
public class SQLParser { private static Logger logger = LoggerUtility.getLogger(SQLParser.class); private String raw; private Map<String, String> sql; public SQLParser(InputStream is) { sql = new HashMap<String, String>(); try { read(is); parse(); } catch (IOException e) { logger.debug(LoggerCodes.TRACE, "Input Stream could not be successfull read!"); } } private void read(InputStream is) throws IOException { StringBuilder builder = new StringBuilder(); BufferedReader in = new BufferedReader(new InputStreamReader(is)); String line = in.readLine(); while (line != null) { builder.append(line + "\n"); line = in.readLine(); } raw = builder.toString(); } public String getSql(String sqlId) { return sql.get(sqlId); } public PreparedStatement getSql(Connection connection, String sqlId) throws SQLException { String statement = sql.get(sqlId); return connection.prepareStatement(statement); } private void parse() { if (raw == null) { logger.debug(LoggerCodes.TRACE, "No String to parse for SQL statements!"); return; } String regex = "\\.*\\[(\\S*)\\]\\s*\\{\\s*([^\\}]*)\\s*\\}"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(raw); while (m.find()) { String key = m.group(1); String body = m.group(2); logger.debug("Adding " + key + " to SQL map."); sql.put(key, body.trim()); } } } Then simply create a new instance of the above and call sqlParser.getSql(id) to obtain the correct SQL.
