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SQLG is a preprocessor and a library that uses code generation to simplify writing JDBC code

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package sqlg3.runtime;

import java.util.Arrays;
import java.util.List;

/**
 * Query piece encapsulating query text and query parameters.
 */
public final class QueryPiece implements QueryLike {

    public final String sql;
    public final Parameter[] data;

    /**
     * Constructor.
     *
     * @param sql SQL text
     * @param data parameters (not null)
     */
    public QueryPiece(CharSequence sql, Parameter[] data) {
        this.sql = sql.toString();
        this.data = data;
    }

    @Override
    public CharSequence getSqlChars() {
        return sql;
    }

    @Override
    public String getSql() {
        return sql;
    }

    @Override
    public List getParameters() {
        return Arrays.asList(data);
    }

    /**
     * Concatenation of query pieces. Parameter that can contain nulls (they are ignored).
     * Line break is inserted between pieces.
     */
    public QueryPiece add(QueryLike... that) {
        QueryBuilder buf = new QueryBuilder(this);
        for (QueryLike piece : that) {
            buf.append(piece);
        }
        return buf.toQuery();
    }

    /**
     * Concatenation of query piece and string. Line break is inserted between them.
     */
    public QueryPiece add(CharSequence sql) {
        return new QueryPiece(QueryBuilder.add(this.sql, sql, true), data);
    }

    public String toString() {
        return sql;
    }
}