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const quoteString = (str) => `"${str}"`;
class Script extends Postgres {
constructor(pool, schema, table, options) {
super(pool, options);
this.schema = schema;
this.table = table;
this.columns = this.getColumns();
this.upsert = options.upsert;
if (this.upsert) this.pkeys = this.getPrimaryKeys();
this.prefix = this.options.prefix || 'INSERT INTO';
this.maxBuffer = options.maxBuffer || 1024 * 1024;
}
getColumns() {
const sql = 'SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE ' +
`TABLE_SCHEMA='${this.schema}' AND TABLE_NAME='${this.table}';`;
return this.query(sql)
.then(d => {
d = d.rows;
if (!d.length)
throw 'TABLE_NOT_FOUND';
return d.map(d => d.column_name);
});
}
getPrimaryKeys() {
const sql = 'SELECT a.attname' +
' FROM pg_index i' +
' JOIN pg_attribute a ON a.attrelid = i.indrelid' +
' AND a.attnum = ANY(i.indkey)' +
` WHERE i.indrelid = '${this.schema}.${this.table}'::regclass` +
' AND i.indisprimary;';
return this.query(sql)
.then(d => d.rows.map(d => d.attname))
.catch(e => {
if (e.message && e.message.includes('op ANY/ALL'))
return [];
else
throw e;
});
}
_push() {
if (this.buffer) {
this.push(this.buffer);
}
this.buffer = undefined;
}
_fn(record) {
return Promise.all([this.columns, this.pkeys]).then(data => {
const columns = data[0];
const pkeys = data[1] || [];
const d = (Array.isArray(record)) ? record[0] : record;
if (typeof d === 'undefined')
return;
if (!this.buffer)
this.buffer = `${this.prefix} ${this.schema}.${this.table} ( ${columns.map(quoteString).join(',')} ) VALUES `;
else
this.buffer += ', ';
this.buffer += '(' + columns.map(key => {
const value = d[key];
if (typeof value === 'undefined')
return 'DEFAULT';
else if (value === null)
return 'null';
else if (typeof value === 'object')
return escapeLiteral(JSON.stringify(value));
else
return escapeLiteral(value);
})
.join(',') + ')';
if (this.upsert) {
let tmp_arr = [];
for (let i = 0, l = columns.length; i < l; i++) {
const value = d[columns[i]];
if (typeof value === 'undefined')
continue;
let sql = `"${columns[i]}" =`;
if (value === null)
sql += 'null';
else if (typeof value === 'object')
sql += escapeLiteral(JSON.stringify(value));
else
sql += escapeLiteral(value);
tmp_arr.push(sql);
}
if (tmp_arr.length && pkeys.length) {
this.buffer += ` ON CONFLICT (${pkeys.map(quoteString).join(', ')}) DO UPDATE SET ${tmp_arr.join(', ')}`;
}
this._push();
}
if (this.buffer && this.buffer.length > this.maxBuffer) this._push();
});
}
_flush(cb) {
this._push();
setImmediate(() => Postgres.prototype._flush(cb));
}
}
// https://github.com/brianc/node-postgres/blob/83a946f61cb9e74c7f499e44d03a268c399bd623/lib/client.js
function escapeLiteral(str) {
let hasBackslash = false;
let escaped = '\'';
if (typeof str !== 'string')
return str;
for (let i = 0; i < str.length; i++) {
const c = str[i];
if (c === '\'') {
escaped += c + c;
} else if (c === '\\') {
escaped += c + c;
hasBackslash = true;
} else {
escaped += c;
}
}
escaped += '\'';
if (hasBackslash === true)
escaped = ' E' + escaped;
return escaped;
}
module.exports = (...params) => new Script(...params);
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