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46 lines
1.5 KiB
46 lines
1.5 KiB
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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