58 lines
2.3 KiB
JavaScript
58 lines
2.3 KiB
JavaScript
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import { Batch } from "./batch.js";
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import { describeResultFromProto } from "./describe.js";
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import { stmtResultFromProto, rowsResultFromProto, rowResultFromProto, valueResultFromProto, } from "./result.js";
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import { sqlToProto } from "./sql.js";
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import { stmtToProto } from "./stmt.js";
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/** A stream for executing SQL statements (a "database connection"). */
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export class Stream {
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/** @private */
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constructor(intMode) {
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this.intMode = intMode;
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}
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/** Execute a statement and return rows. */
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query(stmt) {
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return this.#execute(stmt, true, rowsResultFromProto);
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}
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/** Execute a statement and return at most a single row. */
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queryRow(stmt) {
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return this.#execute(stmt, true, rowResultFromProto);
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}
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/** Execute a statement and return at most a single value. */
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queryValue(stmt) {
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return this.#execute(stmt, true, valueResultFromProto);
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}
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/** Execute a statement without returning rows. */
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run(stmt) {
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return this.#execute(stmt, false, stmtResultFromProto);
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}
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#execute(inStmt, wantRows, fromProto) {
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const stmt = stmtToProto(this._sqlOwner(), inStmt, wantRows);
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return this._execute(stmt).then((r) => fromProto(r, this.intMode));
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}
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/** Return a builder for creating and executing a batch.
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*
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* If `useCursor` is true, the batch will be executed using a Hrana cursor, which will stream results from
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* the server to the client, which consumes less memory on the server. This requires protocol version 3 or
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* higher.
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*/
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batch(useCursor = false) {
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return new Batch(this, useCursor);
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}
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/** Parse and analyze a statement. This requires protocol version 2 or higher. */
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describe(inSql) {
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const protoSql = sqlToProto(this._sqlOwner(), inSql);
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return this._describe(protoSql).then(describeResultFromProto);
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}
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/** Execute a sequence of statements separated by semicolons. This requires protocol version 2 or higher.
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* */
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sequence(inSql) {
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const protoSql = sqlToProto(this._sqlOwner(), inSql);
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return this._sequence(protoSql);
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}
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/** Representation of integers returned from the database. See {@link IntMode}.
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*
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* This value affects the results of all operations on this stream.
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*/
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intMode;
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}
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