internal virtual void CreateTableFromObject(string tableName, IEnumerable <ColumnDefinition> columns)
{
if (!TableExists(tableName))
{
//Id in Zumo is nvarchar(255)
String tblSql = string.Format("CREATE TABLE {0} ({1} nvarchar(255) PRIMARY KEY)",
SqlHelpers.FormatTableName(tableName), SqlHelpers.FormatMember(MobileServiceSystemColumns.Id));
this.ExecuteNonQuery(tblSql, parameters: null);
}
var sql = string.Format("SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = '{0}'", tableName);
IDictionary <string, JObject> existingColumns = this.ExecuteQuery((TableDefinition)null, sql, parameters: null)
.ToDictionary(c => c.Value <string>("COLUMN_NAME"), StringComparer.OrdinalIgnoreCase);
// new columns that do not exist in existing columns of table
var columnsToCreate = columns.Where(c => !existingColumns.ContainsKey(c.Name));
foreach (ColumnDefinition column in columnsToCreate)
{
string createSql = string.Format("ALTER TABLE {0} ADD {1} {2} ", //we make the other columns nullable
SqlHelpers.FormatTableName(tableName),
SqlHelpers.FormatMember(column.Name),
column.StoreType);
this.ExecuteNonQuery(createSql, parameters: null);
}
//TODO: Should we allow dropping columns?
}
public override QueryNode Visit(MemberAccessNode nodeIn)
{
string memberName = SqlHelpers.FormatMember(nodeIn.MemberName);
this.sql.Append(memberName);
return(nodeIn);
}
public string FormatDelete()
{
var delQuery = this.query.Clone(); // create a copy to avoid modifying the original
delQuery.Selection.Clear();
delQuery.Selection.Add(MobileServiceSystemColumns.Id);
delQuery.IncludeTotalCount = false;
var formatter = new SqlQueryFormatter(delQuery);
string selectIdQuery = formatter.FormatSelect();
string idMemberName = SqlHelpers.FormatMember(MobileServiceSystemColumns.Id);
string tableName = SqlHelpers.FormatTableName(delQuery.TableName);
string command = string.Format("DELETE FROM {0} WHERE {1} IN ({2})", tableName, idMemberName, selectIdQuery);
this.Parameters = formatter.Parameters;
return(command);
}
private Task UpsertAsyncInternal(string tableName, IEnumerable <JObject> items, bool fromServer)
{
TableDefinition table = GetTable(tableName);
var first = items.FirstOrDefault();
if (first == null)
{
return(Task.FromResult(0));
}
// Get the columns which we want to map into the database.
var columns = new List <ColumnDefinition>();
foreach (var prop in first.Properties())
{
ColumnDefinition column;
// If the column is coming from the server we can just ignore it,
// otherwise, throw to alert the caller that they have passed an invalid column
if (!table.TryGetValue(prop.Name, out column) && !fromServer)
{
throw new InvalidOperationException(string.Format(Properties.Resources.SqlStore_ColumnNotDefined, prop.Name, tableName));
}
if (column != null)
{
columns.Add(column);
}
}
if (columns.Count == 0)
{
// no query to execute if there are no columns in the table
return(Task.FromResult(0));
}
var mergeIntoSql = String.Format("MERGE INTO {0} AS Target ", SqlHelpers.FormatTableName(tableName));
var mergeAsSourceSql = string.Format(" AS SOURCE ({0}) ", String.Join(", ", columns.Select(c => c.Name).Select(SqlHelpers.FormatMember)));
var mergeConditionSql = string.Format(" ON Target.{0} = Source.{1} ", MobileServiceSystemColumns.Id, MobileServiceSystemColumns.Id);
var whenMatchedSql = String.Format(" WHEN MATCHED THEN UPDATE SET {0} ", String.Join(", ", columns.Select(c => c.Name).Select(c => SqlHelpers.FormatMember(c) + " = " + "Source." + SqlHelpers.FormatMember(c))));
var whenNotMatchedSql = String.Format(" WHEN NOT MATCHED BY TARGET THEN INSERT ({0}) VALUES ({1}); ",
String.Join(", ", columns.Select(c => c.Name).Select(SqlHelpers.FormatMember)),
String.Join(", ", columns.Select(c => " Source." + SqlHelpers.FormatMember(c.Name))));
// Use int division to calculate how many times this record will fit into our parameter quota
int batchSize = MaxParametersPerUpsertQuery / columns.Count;
if (batchSize == 0)
{
throw new InvalidOperationException(string.Format(Properties.Resources.SqlStore_TooManyColumns, MaxParametersPerUpsertQuery));
}
foreach (var batch in items.Split(maxLength: batchSize))
{
var mergeValues = new StringBuilder();
var parameters = new Dictionary <string, object>();
foreach (JObject item in batch)
{
AppendInsertValuesSql(mergeValues, parameters, columns, item);
mergeValues.Append(",");
}
if (parameters.Any())
{
mergeValues.Remove(mergeValues.Length - 1, 1); // remove the trailing comma
var upsertSql = mergeIntoSql
+ string.Format("USING (VALUES {0})", mergeValues)
+ mergeAsSourceSql
+ mergeConditionSql
+ whenMatchedSql
+ whenNotMatchedSql;
this.ExecuteNonQuery(upsertSql, parameters);
}
}
return(Task.FromResult(0));
}
public string FormatSelect()
{
var command = new StringBuilder("SELECT ");
// has top but not skip, use SELECT TOP
if (this.query.Top.HasValue && query.Top.Value > 0 && !this.query.Skip.HasValue)
{
command.AppendFormat(" TOP {0} ", this.query.Top.Value);
}
if (this.query.Selection.Any())
{
string columnNames = String.Join(", ", this.query.Selection.Select(c => SqlHelpers.FormatMember(c)));
command.Append(columnNames);
}
else
{
command.Append("*");
}
return(FormatQuery(command.ToString()));
}