PhoneGap HTML5 DB操做類, 作本地存儲

void function(version){          var app = function(e) {         _this.DB;     }       /**      * 初始化數據庫      * @param {String} dbName      * @param {String} dbVersion      * @param {String} dbDesc      * @param {String} dbSize      */     app.prototype.dbConnect = function(dbName,dbVersion,dbDesc,dbSize){                  try {             if (!window.openDatabase) {                 console.log('Databases are not supported in this browser.');                 return false;             } else {                 dbName      = dbName ? dbName : 'SHICAI_APP';                 dbVersion   = dbVersion ? dbVersion : '1.0';                 dbDesc      = dbDesc ? dbDesc : 'SHICAI_DB for User Mobile';                 dbSize      = dbSize ? dbSize : (2 * 1024 * 1024);                                  _this.DB = openDatabase(dbName, dbVersion, dbDesc, dbSize);                                  return true;             }         } catch(e) {             if (e == 2) {                 console.log("Invalid database version.");             } else {                 console.log("Unknown error "+e+".");             }             return false;         }              }          /**      * 建立表      * @param {String} tableName      * @param {Object} tableField      */     app.prototype.dbDefineTable = function(tableName,tableField){              if(!tableName || !tableField){             console.log('ERROR: Function "dbCreateTable" tableName or tableField is NULL.');         }         var fieldArr = [];         var fieldItem;         var i = 0;                  for (var field in tableField){             field.toString();             tableField[field].toString();             fieldArr[i] = field+' '+tableField[field];                          i++;         }         fieldItem = fieldArr.join(",").toString();                  var SQL = 'CREATE TABLE IF NOT EXISTS '+tableName+' (';         SQL += fieldItem;         SQL +=')';         console.log(SQL);                  _this.DB.transaction(function(tx){             tx.executeSql(SQL,[],function(tx,result){                 return true;             },function(tx,error){                 console.log(error);                 return false;             });         });     }          /**      * 插入數據      * @param {String} tableName      * @param {Object} tableField      * @param {Function} funName      */     app.prototype.dbInsert = function(tableName,tableField,funName){              if(!tableField){             console.log('ERROR: FUNCTION dbInsert tableField is NULL');             return false;         }                  var fieldKeyArr = [];         var fieldValueArr = [];         var fieldKey;         var fieldValue;         var i = 0;                  for (var field in tableField){                      field.toString();             tableField[field].toString();             fieldKeyArr[i] = field;             fieldValueArr[i] = tableField[field];             if(typeof(fieldValueArr[i]) !== 'number'){                 fieldValueArr[i] = '"'+fieldValueArr[i]+'"';             }             i++;         }         fieldKey = fieldKeyArr.join(",");         fieldValue = fieldValueArr.join(",");           var SQL = 'INSERT INTO '+tableName+' (';         SQL += fieldKey;         SQL += ') ';         SQL += 'VALUES (';         SQL += fieldValue;         SQL += ')';         console.log(SQL);                  _this.DB.transaction(function(tx){             tx.executeSql(SQL,[],function(tx,result){                 funName(result);             },function(tx,error){                 console.log(error);                 return false;             });         });     }          /**      * 查詢全部結果      * @param {String}  tableName      * @param {Function} funName      * @param {Object}  tableField      * @param {Object}  dbParams      */     app.prototype.dbFindAll = function(tableName,funName,tableField,dbParams){           tableField = tableField ? tableField : '*';         if(!tableName || !funName){             console.log('ERROR: Function "dbFindAll" tableName or funName is NULL.');         }                  var SQL = '';         SQL +='SELECT '+tableField+' FROM '+tableName;                  _this.DB.transaction(function(tx){             tx.executeSql(SQL,[],_findSuccess,function(tx,error){                 console.log(error);                 return false;             });         });                  function _findSuccess(tx,result){             funName(result);         }       }          /**      * 刪除數據      * @param {String}  tableName      * @param {Object}  dbParams      * @param {Function} funName      */     app.prototype.dbDelete = function(tableName,dbParams,funName){              if(!tableName || !dbParams){             console.log('ERROR: FUNCTION "dbDelete" tableName or dbParams is NULL');             return false;         }         var SQL = '';         SQL +='DELETE FROM '+tableName+' WHERE ';                  var paramArr = new Array();         var paramStr = '';         var i=0;         for(var k in dbParams){             if(typeof(dbParams[k]) !== 'number'){                 dbParams[k] = '"'+dbParams[k]+'"';             }             paramArr[i] = k.toString()+'='+dbParams[k];             i++;         }         paramStr = paramArr.join(" AND ");         SQL += paramStr;                  _this.DB.transaction(function(tx){                 tx.executeSql(SQL);             },[],function(tx,result){                 funName(result);             },function(tx,error){                 console.log(error);                 return false;             });         console.log(SQL);     }          /**      * 更新數據表      * @param {String}  *tableName      * @param {Object}  *dbParams      * @param {Object}  *dbWhere      * @param {Function} funName      */     app.prototype.dbUpdate = function(tableName,dbParams,dbWhere,funName){           var SQL = 'UPDATE '+tableName+' SET ';         var paramArr = new Array();         var paramStr = '';         var i=0;         for(var k in dbParams){             if(typeof(dbParams[k]) !== 'number'){                 dbParams[k] = '"'+dbParams[k]+'"';             }             paramArr[i] = k.toString()+'='+dbParams[k];             i++;         }         paramStr = paramArr.join(" , ");                  SQL += paramStr;         SQL += ' WHERE ';                  var whereArr = new Array();         var whereStr = '';         var n=0;         for(var w in dbWhere){                          if(typeof(dbWhere[w]) !=='number'){                 dbWhere[n] = '"'+dbWhere[w]+'"';             }             whereArr[n] = w.toString()+'='+dbWhere[w];             n++;         }                  whereStr = whereArr.join(" AND ");                  SQL += whereStr;                  _this.DB.transaction(function(tx){                 tx.executeSql(SQL);             },[],function(tx,result){                 funName(result);             },function(tx,error){                 console.log(error);                 return false;             });         console.log(SQL);              }          /**      * 清空數據表      * @param {String} tableName      * @return {Boolean}      */     app.prototype.dbTruncate = function(tableName){              if(!tableName){             console.log('ERROR:Table Name is NULL');             return false;         }                  function _TRUNCATE(tableName){             _this.DB.transaction(function(tx){                 tx.executeSql('DELETE TABLE '+tableName);             },[],function(tx,result){                 console.log('DELETE TABLE '+tableName);                 return true;             },function(tx,error){                 console.log(error);                 return false;             })         }                  _TRUNCATE(tableName);     }          /**      * @desc 刪除數據表      * @param {String} tableName      * @return {Boolean}      */     app.prototype.dbDrop = function(tableName){                  if(!tableName){             console.log('ERROR:Table Name is NULL');             return false;         }                  function _DROP(tableName){             _this.DB.transaction(function(tx){                 tx.executeSql('DROP TABLE '+tableName);             },[],function(tx,result){                 console.log('DROP TABLE '+tableName);                 return true;             },function(tx,error){                 console.log(error);                 return false;             })         }                  _DROP(tableName);     }      }('1.0');