first commit

Author: jhubert

README

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+A very simple Javascript layer for the web based SQLite database.
+
+example usage:
+
+var db = SQLite({ shortName: 'mydb' });
+
+db.createTable('people', 'name TEXT, age INTEGER');
+db.insert('people', { name: 'Jeremy', age: 29 });
+db.update('people', { age: 30 }, { name: 'Jeremy' });
+db.select('people', '*', { age: 30 }, function (transaction, results) { var x; for(x=0; x<results.rows.length; x++) { console.log(results.rows.item(x)); } });

sqlite.js

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+function SQLite(cfg) {
+  if (typeof window.openDatabase === 'undefined') {
+    return;
+  }
+
+  function log(str) {
+    if (typeof console !== 'undefined') {
+      console.log(str);
+    }
+  }
+
+
+  // Default Handlers
+  function nullDataHandler(transaction, results) { }
+
+  function errorHandler(transaction, error) {
+    log('Oops.  Error was ' + error.message + ' (Code ' + error.code + ')');
+  }
+
+  var config = cfg || {}, db;
+  
+  config.shortName = config.shortName || 'mydatabase';
+  config.version = config.version || '1.0';
+  config.displayName = config.displayName || 'My SQLite Database';
+  config.maxSize = 65536;
+  config.defaultErrorHandler = config.defaultErrorHandler || errorHandler;
+  config.defaultDataHandler = config.defaultDataHandler || nullDataHandler;
+
+  try {
+    db = openDatabase(config.shortName, config.version, config.displayName, config.maxSize);
+  } catch (e) {
+    if (e === 2) {
+      log("Invalid database version.");
+    } else {
+      log("Unknown error " + e + ".");
+    }
+
+    return;
+  }
+
+  function execute(query, v, d, e) {
+    var values = v || [],
+      dH = d || config.defaultDataHandler,
+      eH = e || config.defaultErrorHandler;
+
+    if (!query || query === '') {
+      return;
+    }
+
+    db.transaction(
+      function (transaction) {
+        transaction.executeSql(query, values, dH, eH);
+      }
+    );
+  }
+
+  return {
+    database: db,
+    createTable: function (name, cols, data, error) { 
+      var query = "CREATE TABLE " + name + "(" + cols + ");";
+      execute(query, null, data, error);
+    },
+    insert: function (table, map, data, error) {
+      var query = "INSERT INTO " + table + " (#k#) VALUES(#v#);", keys = [], values = [], x;
+
+      for (x in map) {
+        if (map.hasOwnProperty(x)) {
+          keys.push(x);
+          values.push('"' + map[x] + '"');
+        }
+      }
+
+      query = query.replace("#k#", keys.join(','));
+      query = query.replace("#v#", values.join(','));
+
+      execute(query, null, data, error);
+    },
+    update: function (table, map, conditions, data, error) {
+      var query = "UPDATE " + table + " SET #k##m#", keys = [], values = [], matches = [], x;
+
+      for (x in map) {
+        if (map.hasOwnProperty(x)) {
+          keys.push(x + '=?');
+          values.push(map[x]);
+        }
+      }
+
+      if (typeof conditions === 'string') {
+        matches.push(conditions);
+      } else if (typeof conditions === 'number') {
+        matches.push("id=?");
+        values.push(conditions);
+      } else if (typeof conditions === 'object') {
+        for (x in conditions) {
+          if (conditions.hasOwnProperty(x)) {
+            if (x.match(/^\d+$/)) {
+              matches.push(conditions[x]);
+            } else {
+              matches.push(x + '=?');
+              values.push(conditions[x]);
+            }
+          }
+        }
+      }
+
+      if (matches.length > 0) {
+        matches = " WHERE " + matches.join(' AND ');
+      } else {
+        matches = '';
+      }
+
+      query = query.replace("#k#", keys.join(','));
+      query = query.replace("#m#", matches);
+
+      execute(query, values, data, error);
+    },
+    select: function (table, columns, conditions, data, error) {
+      var query = 'SELECT #col# FROM ' + table + '#cond#;', matches = [], x;
+
+      if (typeof columns === 'undefined') {
+        columns = '*';
+      } else if (typeof columns === 'object') {
+        columns.join(',');
+      }
+
+      if (typeof conditions === 'string') {
+        matches.push(conditions);
+      } else if (typeof conditions === 'number') {
+        matches.push("id=" + conditions);
+      } else if (typeof conditions === 'object') {
+        for (x in conditions) {
+          if (conditions.hasOwnProperty(x)) {
+            if (x.match(/^\d+$/)) {
+              matches.push(conditions[x]);
+            } else {
+              matches.push(x + '=' + conditions[x]);
+            }
+          }
+        }
+      }
+
+      if (matches.length > 0) {
+        matches = " WHERE " + matches.join(' AND ');
+      }
+
+      query = query.replace('#col#', columns);
+      query = query.replace('#cond#', matches);
+
+      console.log(query);
+
+      execute(query, null, data, error);
+    }
+  };
+}