db-conn-pgsql/dist/PgQueryUtils.js

Database Connecton Postgres SQL

export class PgQueryUtils {
    formatArraySql(sql) {
        let rt = sql;
        let pos = 0;
        for (let i = 1;; i++) {
            pos = rt.indexOf("?", pos);
            if (pos < 0) {
                break;
            }
            rt = rt.substring(0, pos) + `$${i}` + rt.substring(pos + 1);
            pos = pos + 1;
        }
        return rt;
    }
    formatParams(sql, params) {
        if (!params) {
            return {
                sql: sql
            };
        }
        if (params instanceof Array) {
            return {
                sql: this.formatArraySql(sql),
                params: params
            };
        }
        if (params instanceof Object == false) {
            throw new Error("should not here");
        }
        const regex = /:[a-z][a-z0-9]+/ig;
        const ps = sql.match(regex);
        const paramsArray = [];
        if (ps == null) {
            throw new Error(`No parameters defined: ${sql}`);
        }
        for (let p of ps) {
            const name = p.substring(1);
            paramsArray.push(params[name]);
        }
        let sqlNew = sql;
        let index = 1;
        for (let p of ps) {
            sqlNew = sqlNew.replace(p, `$${index}`);
            index++;
        }
        return {
            sql: sqlNew,
            params: paramsArray
        };
    }
}
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