An ANTLR4 grammar for SQLite 3.8.x based on the official specs.
To install this library, do the following:
git clone https://github.com/bkiers/sqlite-parser
cd sqlite-parser
mvn clean install -DskipTests=trueThe generated parser has been tested by approximately 30000 SQLite statements scraped from the test suite of the SQLite repository. Running these tests, which can take quite a few minutes, can be done as follows:
mvn clean testIf running the tests takes too long for your liking, try increasing the max heap space as follows:
export JAVA_TOOL_OPTIONS="-Xmx4096m" && mvn clean testLet's say you would like to record all the names of functions used in an select-statement:
SELECT log AS x FROM t1
GROUP BY x
HAVING count(*) >= 4
ORDER BY max(n) 0This can be done by attaching a listener to the parse tree that listens
when the parse tree enters an SQL expression, and the function name inside
this expression is not null:
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) throws Exception {
// The list that will hold our function names.
final List<String> functionNames = new ArrayList<String>();
// The select-statement to be parsed.
String sql = "SELECT log AS x FROM t1 \n"
"GROUP BY x \n"
"HAVING count(*) >= 4 \n"
"ORDER BY max(n) 0 \n";
// Create a lexer and parser for the input.
SQLiteLexer lexer = new SQLiteLexer(new ANTLRInputStream(sql));
SQLiteParser parser = new SQLiteParser(new CommonTokenStream(lexer));
// Invoke the `select_stmt` production.
ParseTree tree = parser.select_stmt();
// Walk the `select_stmt` production and listen when the parser
// enters the `expr` production.
ParseTreeWalker.DEFAULT.walk(new SQLiteBaseListener(){
@Override
public void enterExpr(@NotNull SQLiteParser.ExprContext ctx) {
// Check if the expression is a function call.
if (ctx.function_name() != null) {
// Yes, it was a function call: add the name of the function
// to out list.
functionNames.add(ctx.function_name().getText());
}
}
}, tree);
// Print the parsed functions.
System.out.println("functionNames=" functionNames);
}
}which will print:
functionNames=[count, max]