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index.js
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index.js
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// Oracledb Client
// -------
const _ = require('lodash');
const inherits = require('inherits');
const Client_Oracle = require('../oracle');
const QueryCompiler = require('./query/compiler');
const ColumnCompiler = require('./schema/columncompiler');
const Formatter = require('./formatter');
const BlobHelper = require('./utils').BlobHelper;
const ReturningHelper = require('./utils').ReturningHelper;
const Promise = require('../../promise');
const stream = require('stream');
const helpers = require('../../helpers');
const Transaction = require('./transaction');
function Client_Oracledb() {
Client_Oracle.apply(this, arguments);
// Node.js only have 4 background threads by default, oracledb needs one by connection
if (this.driver) {
process.env.UV_THREADPOOL_SIZE = process.env.UV_THREADPOOL_SIZE || 1;
process.env.UV_THREADPOOL_SIZE += this.driver.poolMax;
}
}
inherits(Client_Oracledb, Client_Oracle);
Client_Oracledb.prototype.driverName = 'oracledb';
Client_Oracledb.prototype._driver = function() {
const oracledb = require('oracledb');
return oracledb;
};
Client_Oracledb.prototype.QueryCompiler = QueryCompiler;
Client_Oracledb.prototype.ColumnCompiler = ColumnCompiler;
Client_Oracledb.prototype.Formatter = Formatter;
Client_Oracledb.prototype.Transaction = Transaction;
Client_Oracledb.prototype.prepBindings = function(bindings) {
const self = this;
return _.map(bindings, function(value) {
if (value instanceof BlobHelper && self.driver) {
return {type: self.driver.BLOB, dir: self.driver.BIND_OUT};
// Returning helper always use ROWID as string
} else if (value instanceof ReturningHelper && self.driver) {
return {type: self.driver.STRING, dir: self.driver.BIND_OUT};
} else if (typeof value === 'boolean') {
return value ? 1 : 0;
}
return value;
});
};
// Get a raw connection, called by the `pool` whenever a new
// connection needs to be added to the pool.
Client_Oracledb.prototype.acquireRawConnection = function() {
const client = this;
const asyncConnection = new Promise(function(resolver, rejecter) {
client.driver.getConnection({
user: client.connectionSettings.user,
password: client.connectionSettings.password,
connectString: client.connectionSettings.host + '/' + client.connectionSettings.database
}, function(err, connection) {
if (err)
return rejecter(err);
if (client.connectionSettings.prefetchRowCount) {
connection.setPrefetchRowCount(client.connectionSettings.prefetchRowCount);
}
connection.commitAsync = function() {
const self = this;
return new Promise(function(commitResolve, commitReject) {
if (connection.isTransaction) {
return commitResolve();
}
self.commit(function(err) {
if (err) {
return commitReject(err);
}
commitResolve();
});
});
};
connection.rollbackAsync = function() {
const self = this;
return new Promise(function(rollbackResolve, rollbackReject) {
self.rollback(function(err) {
if (err) {
return rollbackReject(err);
}
rollbackResolve();
});
});
};
const fetchAsync = function(sql, bindParams, options, cb) {
options = options || {};
options.outFormat = client.driver.OBJECT;
if (options.resultSet) {
connection.execute(sql, bindParams || [], options, function(err, result) {
if (err) {
return cb(err);
}
const fetchResult = {rows: [], resultSet: result.resultSet};
const numRows = 100;
const fetchRowsFromRS = function(connection, resultSet, numRows) {
resultSet.getRows(numRows, function(err, rows) {
if (err) {
resultSet.close(function() {
return cb(err);
});
} else if (rows.length === 0) {
return cb(null, fetchResult);
} else if (rows.length > 0) {
if (rows.length === numRows) {
fetchResult.rows = fetchResult.rows.concat(rows);
fetchRowsFromRS(connection, resultSet, numRows);
} else {
fetchResult.rows = fetchResult.rows.concat(rows);
return cb(null, fetchResult);
}
}
});
};
fetchRowsFromRS(connection, result.resultSet, numRows);
});
} else {
connection.execute(sql, bindParams || [], options, cb);
}
};
connection.executeAsync = function(sql, bindParams, options) {
// Read all lob
return new Promise(function(resultResolve, resultReject) {
fetchAsync(sql, bindParams, options, function(err, results) {
if (err) {
return resultReject(err);
}
// Collect LOBs to read
const lobs = [];
if (results.rows) {
if (Array.isArray(results.rows)) {
for (let i = 0; i < results.rows.length; i++) {
// Iterate through the rows
const row = results.rows[i];
for (const column in row) {
if (row[column] instanceof stream.Readable) {
lobs.push({index: i, key: column, stream: row[column]});
}
}
}
}
}
Promise.each(lobs, function(lob) {
return new Promise(function(lobResolve, lobReject) {
readStream(lob.stream, function(err, d) {
if (err) {
if (results.resultSet) {
results.resultSet.close(function() {
return lobReject(err);
});
}
return lobReject(err);
}
results.rows[lob.index][lob.key] = d;
lobResolve();
});
});
}).then(function() {
if (results.resultSet) {
results.resultSet.close(function(err) {
if (err) {
return resultReject(err);
}
return resultResolve(results);
});
}
resultResolve(results);
}, function(err) {
resultReject(err);
});
});
});
};
resolver(connection);
});
});
return asyncConnection;
};
// Used to explicitly close a connection, called internally by the pool
// when a connection times out or the pool is shutdown.
Client_Oracledb.prototype.destroyRawConnection = function(connection, cb) {
connection.release(cb);
};
// Runs the query on the specified connection, providing the bindings
// and any other necessary prep work.
Client_Oracledb.prototype._query = function(connection, obj) {
// Convert ? params into positional bindings (:1)
obj.sql = this.positionBindings(obj.sql);
obj.bindings = this.prepBindings(obj.bindings) || [];
return new Promise(function(resolver, rejecter) {
if (!obj.sql) {
return rejecter(new Error('The query is empty'));
}
const options = {autoCommit: false};
if (obj.method === 'select') {
options.resultSet = true;
}
connection.executeAsync(obj.sql, obj.bindings, options).then(function(response) {
// Flatten outBinds
let outBinds = _.flatten(response.outBinds);
obj.response = response.rows || [];
obj.rowsAffected = response.rows ? response.rows.rowsAffected : response.rowsAffected;
if (obj.method === 'update') {
const modifiedRowsCount = obj.rowsAffected.length || obj.rowsAffected;
const updatedObjOutBinding = [];
const updatedOutBinds = [];
const updateOutBinds = (i) => function(value, index) {
const OutBindsOffset = index * modifiedRowsCount;
updatedOutBinds.push(outBinds[i + OutBindsOffset]);
};
for (let i = 0; i < modifiedRowsCount; i++) {
updatedObjOutBinding.push(obj.outBinding[0]);
_.each(obj.outBinding[0], updateOutBinds(i));
}
outBinds = updatedOutBinds;
obj.outBinding = updatedObjOutBinding;
}
if (!obj.returning && outBinds.length === 0) {
return connection.commitAsync().then(function() {
resolver(obj);
});
}
const rowIds = [];
let offset = 0;
Promise.each(obj.outBinding, function(ret, line) {
offset = offset + (obj.outBinding[line - 1] ? obj.outBinding[line - 1].length : 0);
return Promise.each(ret, function(out, index) {
return new Promise(function(bindResolver, bindRejecter) {
if (out instanceof BlobHelper) {
const blob = outBinds[index + offset];
if (out.returning) {
obj.response[line] = obj.response[line] || {};
obj.response[line][out.columnName] = out.value;
}
blob.on('error', function(err) {
bindRejecter(err);
});
blob.on('finish', function() {
bindResolver();
});
blob.write(out.value);
blob.end();
} else if (obj.outBinding[line][index] === 'ROWID') {
rowIds.push(outBinds[index + offset]);
bindResolver();
} else {
obj.response[line] = obj.response[line] || {};
obj.response[line][out] = outBinds[index + offset];
bindResolver();
}
});
});
}).then(function() {
return connection.commitAsync();
}).then(function() {
if (obj.returningSql) {
return connection.executeAsync(obj.returningSql(), rowIds, {resultSet: true})
.then(function(response) {
obj.response = response.rows;
return obj;
}, rejecter);
}
return obj;
}, rejecter)
.then(function(obj) {
resolver(obj);
});
}, rejecter);
});
};
// Handle clob
function readStream(stream, cb) {
const oracledb = require('oracledb');
let data = '';
if (stream.iLob.type === oracledb.CLOB) {
stream.setEncoding('utf-8');
} else {
data = new Buffer(0);
}
stream.on('error', function(err) {
cb(err);
});
stream.on('data', function(chunk) {
if (stream.iLob.type === oracledb.CLOB) {
data += chunk;
} else {
data = Buffer.concat([data, chunk]);
}
});
stream.on('end', function() {
cb(null, data);
});
}
// Process the response as returned from the query.
Client_Oracledb.prototype.processResponse = function(obj, runner) {
let response = obj.response;
const method = obj.method;
if (obj.output) {
return obj.output.call(runner, response);
}
switch (method) {
case 'select':
case 'pluck':
case 'first':
response = helpers.skim(response);
if (obj.method === 'pluck')
response = _.pluck(response, obj.pluck);
return obj.method === 'first' ? response[0] : response;
case 'insert':
case 'del':
case 'update':
case 'counter':
if (obj.returning) {
if (obj.returning.length === 1 && obj.returning[0] !== '*') {
return _.flatten(_.map(response, _.values));
}
return response;
} else if (!_.isUndefined(obj.rowsAffected)) {
return obj.rowsAffected;
} else {
return 1;
}
default:
return response;
}
};
module.exports = Client_Oracledb;