internal virtual void CreateTableFromObject(string tableName, IEnumerable <ColumnDefinition> columns)
{
ColumnDefinition idColumn = columns.FirstOrDefault(c => c.Name.Equals(MobileServiceSystemColumns.Id));
var colDefinitions = columns.Where(c => c != idColumn).Select(c => String.Format("{0} {1}", SqlHelpers.FormatMember(c.Name), c.StoreType)).ToList();
if (idColumn != null)
{
colDefinitions.Insert(0, String.Format("{0} {1} PRIMARY KEY", SqlHelpers.FormatMember(idColumn.Name), idColumn.StoreType));
}
String tblSql = string.Format("CREATE TABLE IF NOT EXISTS {0} ({1})", SqlHelpers.FormatTableName(tableName), String.Join(", ", colDefinitions));
this.ExecuteNonQuery(tblSql, parameters: null);
string infoSql = string.Format("PRAGMA table_info({0});", SqlHelpers.FormatTableName(tableName));
IDictionary <string, JObject> existingColumns = this.ExecuteQuery((TableDefinition)null, infoSql, parameters: null)
.ToDictionary(c => c.Value <string>("name"), StringComparer.OrdinalIgnoreCase);
// new columns that do not exist in existing columns
var columnsToCreate = columns.Where(c => !existingColumns.ContainsKey(c.Name));
foreach (ColumnDefinition column in columnsToCreate)
{
string createSql = string.Format("ALTER TABLE {0} ADD COLUMN {1} {2}",
SqlHelpers.FormatTableName(tableName),
SqlHelpers.FormatMember(column.Name),
column.StoreType);
this.ExecuteNonQuery(createSql, parameters: null);
}
// NOTE: In SQLite you cannot drop columns, only add them.
}
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 void BatchUpdate(string tableName, IEnumerable <JObject> items, List <ColumnDefinition> columns)
{
if (columns.Count <= 1)
{
return; // For update to work there has to be at least once column besides Id that needs to be updated
}
ValidateParameterCount(columns.Count);
string sqlBase = String.Format("UPDATE {0} SET ", SqlHelpers.FormatTableName(tableName));
foreach (JObject item in items)
{
var sql = new StringBuilder(sqlBase);
var parameters = new Dictionary <string, object>();
ColumnDefinition idColumn = columns.FirstOrDefault(c => c.Name.Equals(MobileServiceSystemColumns.Id));
if (idColumn == null)
{
continue;
}
foreach (var column in columns.Where(c => c != idColumn))
{
string paramName = AddParameter(item, parameters, column);
sql.AppendFormat("{0} = {1}", SqlHelpers.FormatMember(column.Name), paramName);
sql.Append(",");
}
if (parameters.Any())
{
sql.Remove(sql.Length - 1, 1); // remove the trailing comma
}
sql.AppendFormat(" WHERE {0} = {1}", SqlHelpers.FormatMember(MobileServiceSystemColumns.Id), AddParameter(item, parameters, idColumn));
this.ExecuteNonQuery(sql.ToString(), parameters);
}
}
public string FormatSelect()
{
var command = new StringBuilder("SELECT ");
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()));
}
