/
index.js
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index.js
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// SQLite3
// -------
const Bluebird = require('bluebird');
const inherits = require('inherits');
const { isUndefined, map, defaults } = require('lodash');
const Client = require('../../client');
const QueryCompiler = require('./query/compiler');
const SchemaCompiler = require('./schema/compiler');
const ColumnCompiler = require('./schema/columncompiler');
const TableCompiler = require('./schema/tablecompiler');
const SQLite3_DDL = require('./schema/ddl');
const SQLite3_Formatter = require('./formatter');
function Client_SQLite3(config) {
Client.call(this, config);
if (isUndefined(config.useNullAsDefault)) {
this.logger.warn(
'sqlite does not support inserting default values. Set the ' +
'`useNullAsDefault` flag to hide this warning. ' +
'(see docs http://knexjs.org/#Builder-insert).'
);
}
}
inherits(Client_SQLite3, Client);
Object.assign(Client_SQLite3.prototype, {
dialect: 'sqlite3',
driverName: 'sqlite3',
_driver() {
return require('sqlite3');
},
schemaCompiler() {
return new SchemaCompiler(this, ...arguments);
},
queryCompiler() {
return new QueryCompiler(this, ...arguments);
},
columnCompiler() {
return new ColumnCompiler(this, ...arguments);
},
tableCompiler() {
return new TableCompiler(this, ...arguments);
},
ddl(compiler, pragma, connection) {
return new SQLite3_DDL(this, compiler, pragma, connection);
},
wrapIdentifierImpl(value) {
return value !== '*' ? `\`${value.replace(/`/g, '``')}\`` : '*';
},
// Get a raw connection from the database, returning a promise with the connection object.
acquireRawConnection() {
return new Bluebird((resolve, reject) => {
const db = new this.driver.Database(
this.connectionSettings.filename,
(err) => {
if (err) {
return reject(err);
}
resolve(db);
}
);
});
},
// Used to explicitly close a connection, called internally by the pool when
// a connection times out or the pool is shutdown.
destroyRawConnection(connection) {
return Bluebird.fromCallback(connection.close.bind(connection));
},
// Runs the query on the specified connection, providing the bindings and any
// other necessary prep work.
_query(connection, obj) {
const { method } = obj;
let callMethod;
switch (method) {
case 'insert':
case 'update':
case 'counter':
case 'del':
callMethod = 'run';
break;
default:
callMethod = 'all';
}
return new Bluebird(function(resolver, rejecter) {
if (!connection || !connection[callMethod]) {
return rejecter(
new Error(`Error calling ${callMethod} on connection.`)
);
}
connection[callMethod](obj.sql, obj.bindings, function(err, response) {
if (err) return rejecter(err);
obj.response = response;
// We need the context here, as it contains
// the "this.lastID" or "this.changes"
obj.context = this;
return resolver(obj);
});
});
},
_stream(connection, sql, stream) {
const client = this;
return new Bluebird(function(resolver, rejecter) {
stream.on('error', rejecter);
stream.on('end', resolver);
return client
._query(connection, sql)
.then((obj) => obj.response)
.map(function(row) {
stream.write(row);
})
.catch(function(err) {
stream.emit('error', err);
})
.then(function() {
stream.end();
});
});
},
// Ensures the response is returned in the same format as other clients.
processResponse(obj, runner) {
const ctx = obj.context;
let { response } = obj;
if (obj.output) return obj.output.call(runner, response);
switch (obj.method) {
case 'select':
case 'pluck':
case 'first':
if (obj.method === 'pluck') response = map(response, obj.pluck);
return obj.method === 'first' ? response[0] : response;
case 'insert':
return [ctx.lastID];
case 'del':
case 'update':
case 'counter':
return ctx.changes;
default:
return response;
}
},
poolDefaults() {
return defaults(
{ min: 1, max: 1 },
Client.prototype.poolDefaults.call(this)
);
},
formatter() {
return new SQLite3_Formatter(this, ...arguments);
},
});
module.exports = Client_SQLite3;