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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
this.EXPORTED_SYMBOLS = ["GlodaDatabind"];
var Cc = Components.classes;
var Ci = Components.interfaces;
var Cr = Components.results;
var Cu = Components.utils;
Cu.import("resource:///modules/gloda/log4moz.js");
var DBC_LOG = Log4Moz.repository.getLogger("gloda.ds.dbc");
function GlodaDatabind(aNounDef, aDatastore) {
this._nounDef = aNounDef;
this._tableName = aNounDef.tableName;
this._tableDef = aNounDef.schema;
this._datastore = aDatastore;
this._log = Log4Moz.repository.getLogger("gloda.databind." + this._tableName);
// process the column definitions and make sure they have an attribute mapping
for (let [iColDef, coldef] of this._tableDef.columns.entries()) {
// default to the other dude's thing.
if (coldef.length < 3)
coldef[2] = coldef[0];
if (coldef[0] == "id")
this._idAttr = coldef[2];
// colDef[3] is the index of us in our SQL bindings, storage-numbering
coldef[3] = iColDef;
}
// XXX This is obviously synchronous and not perfectly async. Since we are
// doing this, we don't actually need to move to ordinal binding below
// since we could just as well compel creation of the name map and thereby
// avoid ever acquiring the mutex after bootstrap.
// However, this specific check can be cleverly avoided with future work.
// Namely, at startup we can scan for extension-defined tables and get their
// maximum id so that we don't need to do it here. The table will either
// be brand new and thus have a maximum id of 1 or we will already know it
// because of that scan.
this._nextId = 1;
let stmt = this._datastore._createSyncStatement(
"SELECT MAX(id) FROM " + this._tableName, true);
if (stmt.executeStep()) { // no chance of this SQLITE_BUSY on this call
this._nextId = stmt.getInt64(0) + 1;
}
stmt.finalize();
let insertColumns = [];
let insertValues = [];
let updateItems = [];
for (let [iColDef, coldef] of this._tableDef.columns.entries()) {
let column = coldef[0];
let placeholder = "?" + (iColDef + 1);
insertColumns.push(column);
insertValues.push(placeholder);
if (column != "id") {
updateItems.push(column + " = " + placeholder);
}
}
let insertSql = "INSERT INTO " + this._tableName + " (" +
insertColumns.join(", ") + ") VALUES (" + insertValues.join(", ") + ")";
// For the update, we want the 'id' to be a constraint and not a value
// that gets set...
let updateSql = "UPDATE " + this._tableName + " SET " +
updateItems.join(", ") + " WHERE id = ?1";
this._insertStmt = aDatastore._createAsyncStatement(insertSql);
this._updateStmt = aDatastore._createAsyncStatement(updateSql);
if (this._tableDef.fulltextColumns) {
for (let [iColDef, coldef] of this._tableDef.fulltextColumns.entries()) {
if (coldef.length < 3)
coldef[2] = coldef[0];
// colDef[3] is the index of us in our SQL bindings, storage-numbering
coldef[3] = iColDef + 1;
}
let insertColumns = [];
let insertValues = [];
let updateItems = [];
for (var [iColDef, coldef] of this._tableDef.fulltextColumns.entries()) {
let column = coldef[0];
// +2 instead of +1 because docid is implied
let placeholder = "?" + (iColDef + 2);
insertColumns.push(column);
insertValues.push(placeholder);
if (column != "id") {
updateItems.push(column + " = " + placeholder);
}
}
let insertFulltextSql = "INSERT INTO " + this._tableName + "Text (docid," +
insertColumns.join(", ") + ") VALUES (?1," + insertValues.join(", ") +
")";
// For the update, we want the 'id' to be a constraint and not a value
// that gets set...
let updateFulltextSql = "UPDATE " + this._tableName + "Text SET " +
updateItems.join(", ") + " WHERE docid = ?1";
this._insertFulltextStmt =
aDatastore._createAsyncStatement(insertFulltextSql);
this._updateFulltextStmt =
aDatastore._createAsyncStatement(updateFulltextSql);
}
}
GlodaDatabind.prototype = {
/**
* Perform appropriate binding coercion based on the schema provided to us.
* Although we end up effectively coercing JS Date objects to numeric values,
* we should not be provided with JS Date objects! There is no way for us
* to know to turn them back into JS Date objects on the way out.
* Additionally, there is the small matter of storage's bias towards
* PRTime representations which may not always be desirable.
*/
bindByType: function(aStmt, aColDef, aValue) {
if (aValue == null)
aStmt.bindNullParameter(aColDef[3]);
else if (aColDef[1] == "STRING" || aColDef[1] == "TEXT")
aStmt.bindStringParameter(aColDef[3], aValue);
else
aStmt.bindInt64Parameter(aColDef[3], aValue);
},
objFromRow: function(aRow) {
let getVariant = this._datastore._getVariant;
let obj = new this._nounDef.class();
for (let [iCol, colDef] of this._tableDef.columns.entries()) {
obj[colDef[2]] = getVariant(aRow, iCol);
}
return obj;
},
objInsert: function(aThing) {
let bindByType = this.bindByType;
if (!aThing[this._idAttr])
aThing[this._idAttr] = this._nextId++;
let stmt = this._insertStmt;
for (let colDef of this._tableDef.columns) {
bindByType(stmt, colDef, aThing[colDef[2]]);
}
stmt.executeAsync(this._datastore.trackAsync());
if (this._insertFulltextStmt) {
stmt = this._insertFulltextStmt;
stmt.bindInt64Parameter(0, aThing[this._idAttr]);
for (let colDef of this._tableDef.fulltextColumns) {
bindByType(stmt, colDef, aThing[colDef[2]]);
}
stmt.executeAsync(this._datastore.trackAsync());
}
},
objUpdate: function(aThing) {
let bindByType = this.bindByType;
let stmt = this._updateStmt;
// note, we specially bound the location of 'id' for the insert, but since
// we're using named bindings, there is nothing special about setting it
for (let colDef of this._tableDef.columns) {
bindByType(stmt, colDef, aThing[colDef[2]]);
}
stmt.executeAsync(this._datastore.trackAsync());
if (this._updateFulltextStmt) {
stmt = this._updateFulltextStmt;
// fulltextColumns doesn't include id/docid, need to explicitly set it
stmt.bindInt64Parameter(0, aThing[this._idAttr]);
for (let colDef of this._tableDef.fulltextColumns) {
bindByType(stmt, colDef, aThing[colDef[2]]);
}
stmt.executeAsync(this._datastore.trackAsync());
}
},
adjustAttributes: function() {
// just proxy the call over to the datastore... we have to do this for
// 'this' reasons. we don't refactor things to avoid this because it does
// make some sense to have all the methods exposed from a single object,
// even if the implementation does live elsewhere.
return this._datastore.adjustAttributes.apply(this._datastore, arguments);
},
// also proxied...
queryFromQuery: function() {
return this._datastore.queryFromQuery.apply(this._datastore, arguments);
}
};
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