/// <summary>
/// Deletes items from local table with the given list of ids
/// </summary>
/// <param name="tableName">Name of the local table.</param>
/// <param name="ids">A list of ids of the items to be deleted</param>
/// <returns>A task that completes when delete query has executed.</returns>
public override Task DeleteAsync(string tableName, IEnumerable <string> ids)
{
if (tableName == null)
{
throw new ArgumentNullException("tableName");
}
if (ids == null)
{
throw new ArgumentNullException("ids");
}
this.EnsureInitialized();
string idRange = String.Join(",", ids.Select((_, i) => "@id" + i));
string sql = string.Format("DELETE FROM {0} WHERE {1} IN ({2})",
SqlHelpers.FormatTableName(tableName),
MobileServiceSystemColumns.Id,
idRange);
var parameters = new Dictionary <string, object>();
int j = 0;
foreach (string id in ids)
{
parameters.Add("@id" + (j++), id);
}
this.ExecuteNonQuery(sql, parameters);
return(Task.FromResult(0));
}
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}",
SqlHelpers.FormatTableName(tableName),
SqlHelpers.FormatMember(column.Name),
column.StoreType);
this.ExecuteNonQuery(createSql, parameters: null);
}
//TODO: Should we allow dropping columns?
}
private string FormatQuery(string command)
{
Reset();
this.sql.Append(command);
string tableName = SqlHelpers.FormatTableName(this.query.TableName);
this.sql.AppendFormat(" FROM {0}", tableName);
if (this.query.Filter != null)
{
this.FormatWhereClause(this.query.Filter);
}
if (this.query.Ordering.Count > 0)
{
this.FormatOrderByClause(this.query.Ordering);
}
// OFFSET with FETCH
if (this.query.Skip.HasValue && query.Skip.Value > 0 && this.query.Top.HasValue && query.Top.Value > 0)
{
this.FormatLimitClause(this.query.Top.Value, this.query.Skip.Value);
}
return(GetSql());
}
private void FormatCountQuery()
{
string tableName = SqlHelpers.FormatTableName(this.query.TableName);
this.sql.AppendFormat("SELECT COUNT(1) AS [count] FROM {0}", tableName);
if (this.query.Filter != null)
{
this.FormatWhereClause(this.query.Filter);
}
}
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);
}
/// <summary>
/// Executes a lookup against a local table.
/// </summary>
/// <param name="tableName">Name of the local table.</param>
/// <param name="id">The id of the item to lookup.</param>
/// <returns>A task that will return with a result when the lookup finishes.</returns>
public override Task <JObject> LookupAsync(string tableName, string id)
{
if (tableName == null)
{
throw new ArgumentNullException("tableName");
}
if (id == null)
{
throw new ArgumentNullException("id");
}
this.EnsureInitialized();
string sql = string.Format("SELECT * FROM {0} WHERE {1} = @id", SqlHelpers.FormatTableName(tableName), MobileServiceSystemColumns.Id);
var parameters = new Dictionary <string, object>
{
{ "@id", id }
};
IList <JObject> results = this.ExecuteQuery(tableName, sql, parameters);
return(Task.FromResult(results.FirstOrDefault()));
}
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.SqlCeStore_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 insertSqlBase = String.Format(
"INSERT INTO {0} ({1}) VALUES ",
SqlHelpers.FormatTableName(tableName),
String.Join(", ", columns.Select(c => c.Name).Select(SqlHelpers.FormatMember))
);
var updateSqlBase = String.Format("UPDATE {0} SET ", SqlHelpers.FormatTableName(tableName));
// 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.SqlCeStore_TooManyColumns, MaxParametersPerUpsertQuery));
}
foreach (var batch in items.Split(maxLength: batchSize))
{
StringBuilder sql = new StringBuilder();
var parameters = new Dictionary <string, object>();
foreach (JObject item in batch)
{
// there's no upsert in SQL CE so we'll settle if an 'If Not Exist, Insert' approach
if (!RowExists(SqlHelpers.FormatTableName(tableName),
item.GetValue(MobileServiceSystemColumns.Id, StringComparison.OrdinalIgnoreCase).ToString()))
{
sql = new StringBuilder(insertSqlBase);
AppendInsertValuesSql(sql, parameters, columns, item);
}
else
{
sql = new StringBuilder(updateSqlBase);
AppendUpdateValuesSql(sql, parameters, columns, item);
string updateCondition = string.Format(" WHERE {0} = '{1}'", MobileServiceSystemColumns.Id, item.GetValue(MobileServiceSystemColumns.Id, StringComparison.OrdinalIgnoreCase).ToString());
sql.Append(updateCondition);
}
if (parameters.Any())
{
this.ExecuteNonQuery(sql.ToString(), parameters);
}
}
}
return(Task.FromResult(0));
}
