My query works fine if the person exist in my table, but if he/she does not; the NodeJS will give me an error.
function ClientConnected(remoteClient)
{
debugLog(remoteClient.name + " connected to the server. (ID: " + remoteClient.networkId + ") Loading player data..");
sql.query('SELECT * FROM `players` WHERE `character_name` = ?', [remoteClient.name], function(err, rows)
{
if(err)
{
debugLog('[DB] Error when loading ' + remoteClient.name + "'s (" + remoteClient.networkId + ') data: ' + err.code);
} else {
players[remoteClient.networkId] = {
'a_socialid' : rows[0].account_socialid,
'i_money' : rows[0].inventory_money,
};
debugLog("Successfully loaded " + remoteClient.name + "'s (" + remoteClient.networkId + ") data..");
}
});
}
events.Add("ClientConnected", ClientConnected);
If someone joins with the name that already exists in the table, it will load the players data:
But if not, it gives me an error. (TypeError, undefined, blabla)
You need to check that a record was returned. Maybe something like this:
if(err)
{
debugLog('[DB] Error when loading ' + remoteClient.name + "'s (" + remoteClient.networkId + ') data: ' + err.code);
} else if (rows.length === 0) {
debugLog('Nothing returned from database');
} else {
// ...
}
Presumably the err result would only give you feedback on the actual query, not the data it returns.
Related
I have a problem with a MySQL query, I'm making a controller where I need a filter on the front (React). The controller is made with params inside the route, but is not working when I try to test it with Postman, but if I make the same exact query on phpmyadmin works perfectly.
Controller:
let { tabla, nameUno, fechaIni, fechaFin, nameDos, nameTres, nameCuatro } =
req.params;
conn.query(
// SELECT * FROM tyt_finan WHERE tf_fecha_r BETWEEN '2022-05-31' AND '2022-06-01' AND tf_city IN ('Bogota') AND tf_estado = 'Pendiente' AND tf_campana = 'IN'
"SELECT * FROM " +
tabla +
" WHERE " +
nameUno +
" BETWEEN " +
fechaIni +
" AND " +
fechaFin +
" AND " +
nameDos +
" IN ('') AND " +
nameTres +
" = ? AND " +
nameCuatro +
" = ?",
[req.params.value1, req.params.value2, req.params.value3],
Routes
routes.get(
"/searchAll/:tabla/:nameUno/:fechaIni/:fechaFin/:nameDos/:value1/:nameTres/:value2/:nameCuatro/:value3",
defaultController.searchAll
);
And this is the GET petition that I'm sending on Postman:
http://localhost:9000/searchAll/tyt_finan/tf_fecha_r/'2022-05-31'/'2022-06-01'/tf_city/'Bogota','Barranquilla'/tf_estado/'Pendiente'/tf_campana/'IN'
Use parameters for the variables. It's also easier to use a template literal than concatenation to construct the SQL string with variables for the table and column names.
You also had more values in your parameters array than ? in the SQL. I've replaced IN ('') with = ? to use value1 there.
let {tabla, nameUno, fechaIni, fechaFin, nameDos, value1, nameTres, value2, nameCuatro, value3} = req.params;
conn.query(
`SELECT *
FROM ${tabla}
WHERE ${nameUno} BETWEEN ? AND ?
AND ${nameDos} = ?
AND ${nameTres} = ?
AND ${nameCuatro} = ?`, [fetchaIni, fechaFin, value1, value2, value3], (err, res) => {
if (!err) {
console.log(res);
}
});
I'm currently having trouble querying a DynamoDB table where the partition key, id, is of type number. This is for a wider project for my own Alexa Skill on AWS. My skill will take as input from the user, a unique id value, which is of slot type AMAZON.NUMBER.
I've looked at the documentation for query and nothing I've tried worked so I decided to start from scratch to a template.
Again, I am just trying to query a table for data based on a partition key called "id" that has a numeric value. The Code below is what I have managed to narrow down as the source of the error.
var params = {
TableName : "QueryTestTable",
KeyConditionExpression: "#pkey = :value",
ExpressionAttributeNames:{
"#pkey": "id"
},
ExpressionAttributeValues: {
":value": idNumber
}
};
return docClient.query(params, function(err,data) {
if (err) {
console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
} else {
console.log("Query succeeded.");
console.log("data = " + JSON.stringify(data,null,2));
data.Items.forEach(function(item) {
console.log(" -", item.id + ": " + item.firstName);
results += item.id + " has name " +item.firstName + " " + item.lastName + ".\n";
});
}
if (results)
speakOutput = results;
else
speakOutput = "Sorry, no result for " + idNumber +" was found in the database.";
return handlerInput.responseBuilder
.speak(speakOutput)
.reprompt()
.withSimpleCard(SKILL_NAME, speakOutput) //added to generate video output.
.getResponse();
})
I'm just using a simplified version of my table for now. But the above code snippet. For some reason, It keeps skipping to the no entries found in the database statement.
I am writing a MySQL INSERT ... ON DUPLICATE KEY UPDATE implementation via a raw SQL command in EF Core 2.0. I am very close to a working solution, but the only problem that I have is determining which PropertyInfos read via reflection are primary keys. In the CreateUpdates() method below, how can I filter primary keys out from columnProperties so they are not a part of the update SQL statement?
I have tried using EntityFramework.PrimaryKey
, but I cannot seem to get it to work with generics (TEntity).
I have included all of my relevant code, but the piece I am focused on in this question is the TODO in the last method, CreateUpdates().
private static void InsertOnDuplicateKeyUpdate<TEntity>(DbContext dbContext) where TEntity : class
{
var columnProperties = GetColumnPropertiesLessBaseEntityTimestamps<TEntity>();
var tableName = GetTableName<TEntity>();
var columns = string.Join(", ", columnProperties.Select(x => x.Name));
var values = CreateValues<TEntity>(columnProperties);
var updates = CreateUpdates(columnProperties);
var rawSqlString = "INSERT INTO " + tableName + " (" + columns + ") VALUES " + values +
" ON DUPLICATE KEY UPDATE " + updates;
dbContext.Set<TEntity>().FromSql(rawSqlString);
dbContext.SaveChanges();
}
private static string GetTableName<TEntity>()
{
return typeof(TEntity).Name.Pluralize().ToLower();
}
private static List<PropertyInfo> GetColumnPropertiesLessBaseEntityTimestamps<TEntity>()
{
return typeof(TEntity).GetProperties().Where(x =>
x.PropertyType.Namespace != "System.Collections.Generic" &&
!new List<string> {"CreatedDateUtc", "ModifiedDateUtc"}.Contains(x.Name)).ToList();
}
private static string CreateValues<TEntity>(IReadOnlyCollection<PropertyInfo> columnProperties)
{
return GetSeedRows<TEntity>().Select(row => CreateRowValues(columnProperties, row)).Aggregate("",
(current, rowValues) => current == "" ? rowValues : current + ", " + rowValues);
}
private static string CreateRowValues<TEntity>(IEnumerable<PropertyInfo> columnProperties, TEntity row)
{
return (from property in columnProperties
let value = row.GetType().GetProperty(property.Name).GetValue(row)
select WrapStringPropertyValueInSingleQuotes(property, value)).Aggregate("",
(current, value) => current == "" ? "(" + value : current + ", " + value) + ")";
}
private static object WrapStringPropertyValueInSingleQuotes(PropertyInfo property, object value)
{
if (property.PropertyType == typeof(string))
value = "'" + value + "'";
return value;
}
private static string CreateUpdates(IEnumerable<PropertyInfo> columnProperties)
{
//TODO: filter out primary keys from columnProperties
return columnProperties.Select(property => property.Name).Aggregate("", (current, column) => current == ""
? column + " = VALUES(" + column + ")"
: current + ", " + column + " = VALUES(" + column + ")");
}
In ef-core it has become much easier to retrieve meta data from the mapping model. You can get the PropertyInfos of the primary key by this line:
var keyPropertyInfos = dbContext.Model.FindEntityType(typeof(TEntity))
.FindPrimaryKey()
.Properties
.Select(p => p.PropertyInfo);
By the way, you can get all (mapped) properties by replacing FindPrimaryKey().Properties by GetProperties();
I want to make a query after another query in node.js with sequqlize. Second query iterate ower the first elements query result.
The code:
exports.index = function(req, res) {
sqldb.sequelize.query("select * from food", {type: sqldb.sequelize.QueryTypes.SELECT})
.then(function (food) {
for (var i = food.length; i--;) {
sqldb.sequelize.query("select i.name_ingredient " +
"from food_incredients as fi, " +
"ingredients as i " +
"where fi.food_id = " + food[i].id + " and " +
"i.id = fi.ingredient_id;",
{type: sqldb.sequelize.QueryTypes.SELECT}).then(function (ingredients) {
food[i]["ingredients"] = ingredients;
});
}
res.status(200).json(food);
}
);
At the line when I try to add "infredients" field I reveive an error that the "food[i]" object is undefined. How can I fix this problem and return the "food" with ingredients for every elements?
Thanks
In my node app i am using mysql. I retrieve data from mysql and converting each row to json(working fine).But my requirement i have to print the field with value otherwise don't.
Consider:
My sql result..
level0:"xxxxxx" level1:"fffffff" level3:"btggtgt" level:""
Now the json i am getting is:
[
{
level0="xxxxxxx",
level1="fffffff",
level3="btggtgt".
level4=""
}
]
But i need the output as:
[
{
level0="xxxxxxx",
level1="fffffff",
level3="btggtgt"
}
]
i have to omit level4 because its value is ""(empty).
My code is:
connection.query("select * from levels where level0 = '" + level0 + "' and level1 = '"+level1+"' and level2 = ''", function(err, row1, fields) {
res.writeHead(200, { 'Content-Type': 'application/json'});
res.end(JSON.stringify(row1,null,"\n"));
});
var query5result;
querylevel5(function(result5)
{
for (var level in result5)
{
console.log("ssssssss="+util.inspect(result5[level]))
if (result5[level] == null || result5[level] == '')
{
delete result5[level];
}
}
query5result=result5;
Here is a way to loop and delete this empty level
connection.query("select * from levels where level0 = '" + level0 + "' and level1 = '"+level1+"' and level2 = ''", function(err, row1, fields) {
for (var level in row1)
{
if (row1[level] == null || row1[level] == "")
{
delete row1[level];
}
}
)};
//...then go on:
res.end(JSON.stringify(row1,null,"\n"));