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SQLiteDatabaseClient schema methods #283

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Merged
merged 2 commits into from
Jun 7, 2022
Merged

SQLiteDatabaseClient schema methods #283

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c8599fb
SQLiteDatabaseClient schema
mbostock Apr 26, 2022
400ae03
remove redundant error
mbostock Jun 7, 2022
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52 changes: 47 additions & 5 deletions src/sqlite.js
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Original file line number Diff line number Diff line change
Expand Up @@ -28,11 +28,16 @@ export class SQLiteDatabaseClient {
text(rows.map(row => row.detail).join("\n"))
]);
}
async describe(object) {
const rows = await (object === undefined
? this.query(`SELECT name FROM sqlite_master WHERE type = 'table'`)
: this.query(`SELECT * FROM pragma_table_info(?)`, [object]));
if (!rows.length) throw new Error("Not found");
async describeTables() {
return this.query(`SELECT name FROM sqlite_master WHERE type = 'table'`);
}
async describeColumns({table} = {}) {
const rows = await this.query(`SELECT name, type, notnull FROM pragma_table_info(?) ORDER BY cid`, [table]);
if (!rows.length) throw new Error(`table not found: ${table}`);
return rows.map(({name, type, notnull}) => ({name, type: sqliteType(type), databaseType: type, nullable: !notnull}));
}
async describe(table) {
const rows = await (table === undefined ? this.describeTables() : this.describeColumns({table}));
const {columns} = rows;
return element("table", {value: rows}, [
element("thead", [element("tr", columns.map(c => element("th", [text(c)])))]),
Expand All @@ -46,10 +51,47 @@ export class SQLiteDatabaseClient {
return [strings.join("?"), params];
}
}

Object.defineProperty(SQLiteDatabaseClient.prototype, "dialect", {
value: "sqlite"
});

// https://www.sqlite.org/datatype3.html
function sqliteType(type) {
switch (type) {
case "NULL":
return "null";
case "INT":
case "INTEGER":
case "TINYINT":
case "SMALLINT":
case "MEDIUMINT":
case "BIGINT":
case "UNSIGNED BIG INT":
case "INT2":
case "INT8":
return "integer";
case "TEXT":
case "CLOB":
return "string";
case "REAL":
case "DOUBLE":
case "DOUBLE PRECISION":
case "FLOAT":
case "NUMERIC":
return "number";
case "BLOB":
return "buffer";
case "DATE":
case "DATETIME":
return "string"; // TODO convert strings to Date instances in sql.js
default:
return /^(?:(?:(?:VARYING|NATIVE) )?CHARACTER|(?:N|VAR|NVAR)CHAR)\(/.test(type) ? "string"
: /^(?:DECIMAL|NUMERIC)\(/.test(type) ? "number"
: "other";
}
}

function load(source) {
return typeof source === "string" ? fetch(source).then(load)
: source instanceof Response || source instanceof Blob ? source.arrayBuffer().then(load)
Expand Down