slim-node-mysql/dist/MySQLPreparedStatement.js

MySQL database class to abstract pooling and prepared statements

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.MySQLPreparedStatement = void 0;
const PreparedStatementError_1 = require("./errors/PreparedStatementError");
/**
 * A MySQL prepared statement. Parses a SQL query with variables and returns the prepared SQL string and variable to value map.
 */
class MySQLPreparedStatement {
    constructor(sqlString, parameters) {
        this.replaceValuesWith = '?';
        this.sqlString = sqlString;
        this.parameters = parameters;
    }
    /**
     * Set the string to replace SQL variables with (? for MySQL).
     * Defaults to '?'.
     * @param replaceValuesWith the string to replace variables with.
     */
    setReplaceValuesWith(replaceValuesWith) {
        this.replaceValuesWith = replaceValuesWith;
    }
    /**
     * Prepare the SQL string and values for execution.
     * @returns the prepared SQL string and values.
     */
    prepare() {
        let preparedSQL = this.sqlString;
        const preparedValues = [];
        let match;
        while ((match = preparedSQL.match(/@([A-Za-z_]+)/))) {
            const variableName = match[0];
            const baseVariableName = match[1];
            if (!(baseVariableName in this.parameters)) {
                throw new PreparedStatementError_1.PreparedStatementError(`Missing prepared statement value for SQL variable '${variableName}'`);
            }
            preparedSQL = preparedSQL.replace(variableName, this.replaceValuesWith);
            preparedValues.push(this.parameters[baseVariableName]);
        }
        return {
            preparedSQL,
            preparedValues: preparedValues.length > 0 ? preparedValues : null,
        };
    }
}
exports.MySQLPreparedStatement = MySQLPreparedStatement;
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