mysql-rest/lib/util/sqlstring.helper.js

One command to generate REST APIs for any MySql database, support multi databases

function convertToDameng(query, params) {
    // Convert the query to uppercase
    let upperQuery = query.toUpperCase();

    // Replace backticks (`) with double quotes (")
    upperQuery = upperQuery.replace(/`/g, '"');

    // Collect all `??` or `?` placeholders into a new array
    const allPlaceholders = [];
    const allPlaceholderRegex = /\?\??/g;
    while ((match = allPlaceholderRegex.exec(upperQuery)) !== null) {
        allPlaceholders.push(match[0]);
    }

    for (let i = 0; i < allPlaceholders.length; i++) {
        if (allPlaceholders[i] == "??") {
            if (typeof params[i] === 'string') {
                params[i] = params[i].toUpperCase();
            }
            if (Array.isArray(params[i])) {
                params[i] = params[i].map(item => typeof item === 'string' ? item.toUpperCase() : item);
            }
        }
    }

    // Match MySQL LIMIT clause (e.g., LIMIT ?,?)
    const mysqlLimitRegex = /LIMIT\s+\?,\s*\?/i;

    // Replace MySQL LIMIT with Dameng's LIMIT ... OFFSET syntax
    if (upperQuery.includes('LIMIT')) {
        const lastIndex = params.length - 1;
        [params[lastIndex - 1], params[lastIndex]] = [params[lastIndex], params[lastIndex - 1]];
    }
    upperQuery = upperQuery.replace(mysqlLimitRegex, "LIMIT ? OFFSET ?");

    return { query: upperQuery, params };
}

// Export the function
module.exports = { convertToDameng };