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47 lines
1.5 KiB
47 lines
1.5 KiB
3 years ago
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export function query(sql, ...args) {
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validateQuery(sql, ...args);
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return buildQuery(sql, ...args);
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}
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// Allow for slightly more complex parameter substitution.
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// Instances of "???" will be replaced by the same number of comma-separated
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// question marks as items in the corresponding nested parateter array
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// eg. buildQuery("SELECT (???) FROM ?", [["col1", "col2"], "table1"])
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// would output: ["SELECT (?, ?) FROM ?", ["col1", "col2", "table1"]]
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export function buildQuery(sql, ...args) {
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const parts = sql.split("???");
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const subParamLengths = args
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.filter(Array.isArray)
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.map((a) => a.length);
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if (parts.length !== subParamLengths.length + 1) {
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throw new PawSQLiteError("Unable to build query: sub-" +
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"paramters do not match sub-paramters in query");
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}
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const newQuery = parts.reduce((p1, p2, i) => {
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const length = subParamLengths[i - 1];
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return p1 + new Array(length).fill("?").join(", ") + p2;
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});
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const flatParams = args.reduce((acc, v) => {
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if (Array.isArray(v)) {
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Array.prototype.push.apply(acc, v);
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} else {
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acc.push(v);
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}
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return acc;
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}, []);
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return [newQuery, ...flatParams];
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}
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export function validateQuery(sql, ...args) {
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const reg = /^\s*(BEGIN|END|COMMIT|ROLLBACK)(?:[^A-Z]|$)/i;
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const match = reg.exec(sql);
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if (match) {
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const statement = match[1].toUpperCase();
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throw new PawSQLiteError("Manually managing transactions is " +
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"forbidden. Found: \"" + statement + "\" statement.");
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}
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}
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