/// <summary>
/// Execute an INSERT query.
/// </summary>
/// <param name="tableName">The table in which you wish to INSERT.</param>
/// <param name="keyValuePairs">The key-value pairs for the row you wish to INSERT.</param>
/// <returns>A DataTable containing the results.</returns>
public DataTable Insert(string tableName, Dictionary <string, object> keyValuePairs)
{
if (String.IsNullOrEmpty(tableName))
{
throw new ArgumentNullException(nameof(tableName));
}
if (keyValuePairs == null || keyValuePairs.Count < 1)
{
throw new ArgumentNullException(nameof(keyValuePairs));
}
#region Variables
string keys = "";
string values = "";
string query = "";
int insertedId = 0;
string retrievalQuery = "";
DataTable result;
#endregion
#region Build-Key-Value-Pairs
int added = 0;
foreach (KeyValuePair <string, object> curr in keyValuePairs)
{
if (String.IsNullOrEmpty(curr.Key))
{
continue;
}
if (added == 0)
{
#region First
keys += PreparedFieldname(curr.Key);
if (curr.Value != null)
{
if (curr.Value is DateTime || curr.Value is DateTime?)
{
values += "'" + DbTimestamp(_DbType, (DateTime)curr.Value) + "'";
}
else if (curr.Value is int || curr.Value is long || curr.Value is decimal)
{
values += curr.Value.ToString();
}
else
{
if (Helper.IsExtendedCharacters(curr.Value.ToString()))
{
values += PreparedUnicodeValue(curr.Value.ToString());
}
else
{
values += PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
values += "null";
}
#endregion
}
else
{
#region Subsequent
keys += "," + PreparedFieldname(curr.Key);
if (curr.Value != null)
{
if (curr.Value is DateTime || curr.Value is DateTime?)
{
values += ",'" + DbTimestamp(_DbType, (DateTime)curr.Value) + "'";
}
else if (curr.Value is int || curr.Value is long || curr.Value is decimal)
{
values += "," + curr.Value.ToString();
}
else
{
if (Helper.IsExtendedCharacters(curr.Value.ToString()))
{
values += "," + PreparedUnicodeValue(curr.Value.ToString());
}
else
{
values += "," + PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
values += ",null";
}
#endregion
}
added++;
}
#endregion
#region Build-INSERT-Query-and-Submit
switch (_DbType)
{
case DbTypes.MsSql:
query = MssqlHelper.InsertQuery(tableName, keys, values);
break;
case DbTypes.MySql:
query = MysqlHelper.InsertQuery(tableName, keys, values);
break;
case DbTypes.PgSql:
query = PgsqlHelper.InsertQuery(tableName, keys, values);
break;
}
result = Query(query);
#endregion
#region Post-Retrieval
switch (_DbType)
{
case DbTypes.MsSql:
#region MsSql
//
// built into the query
//
break;
#endregion
case DbTypes.MySql:
#region MySql
if (!Helper.DataTableIsNullOrEmpty(result))
{
bool idFound = false;
string primaryKeyColumn = GetPrimaryKeyColumn(tableName);
foreach (DataRow curr in result.Rows)
{
if (Int32.TryParse(curr["id"].ToString(), out insertedId))
{
idFound = true;
break;
}
}
if (!idFound)
{
result = null;
}
else
{
retrievalQuery = "SELECT * FROM `" + tableName + "` WHERE " + primaryKeyColumn + "=" + insertedId;
result = Query(retrievalQuery);
}
}
break;
#endregion
case DbTypes.PgSql:
#region PgSql
//
// built into the query
//
break;
#endregion
}
#endregion
return(result);
}
/// <summary>
/// Execute an UPDATE query.
/// </summary>
/// <param name="tableName">The table in which you wish to UPDATE.</param>
/// <param name="keyValuePairs">The key-value pairs for the data you wish to UPDATE.</param>
/// <param name="filter">The expression containing the UPDATE filter (i.e. WHERE clause data).</param>
/// <returns>A DataTable containing the results.</returns>
public DataTable Update(string tableName, Dictionary <string, object> keyValuePairs, Expression filter)
{
if (String.IsNullOrEmpty(tableName))
{
throw new ArgumentNullException(nameof(tableName));
}
if (keyValuePairs == null || keyValuePairs.Count < 1)
{
throw new ArgumentNullException(nameof(keyValuePairs));
}
#region Variables
string query = "";
string keyValueClause = "";
DataTable result;
#endregion
#region Build-Key-Value-Clause
int added = 0;
foreach (KeyValuePair <string, object> curr in keyValuePairs)
{
if (String.IsNullOrEmpty(curr.Key))
{
continue;
}
if (added == 0)
{
if (curr.Value != null)
{
if (curr.Value is DateTime || curr.Value is DateTime?)
{
keyValueClause += PreparedFieldname(curr.Key) + "='" + DbTimestamp(_DbType, (DateTime)curr.Value) + "'";
}
else if (curr.Value is int || curr.Value is long || curr.Value is decimal)
{
keyValueClause += PreparedFieldname(curr.Key) + "=" + curr.Value.ToString();
}
else
{
if (Helper.IsExtendedCharacters(curr.Value.ToString()))
{
keyValueClause += PreparedFieldname(curr.Key) + "=" + PreparedUnicodeValue(curr.Value.ToString());
}
else
{
keyValueClause += PreparedFieldname(curr.Key) + "=" + PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
keyValueClause += PreparedFieldname(curr.Key) + "= null";
}
}
else
{
if (curr.Value != null)
{
if (curr.Value is DateTime || curr.Value is DateTime?)
{
keyValueClause += "," + PreparedFieldname(curr.Key) + "='" + DbTimestamp(_DbType, (DateTime)curr.Value) + "'";
}
else if (curr.Value is int || curr.Value is long || curr.Value is decimal)
{
keyValueClause += "," + PreparedFieldname(curr.Key) + "=" + curr.Value.ToString();
}
else
{
if (Helper.IsExtendedCharacters(curr.Value.ToString()))
{
keyValueClause += "," + PreparedFieldname(curr.Key) + "=" + PreparedUnicodeValue(curr.Value.ToString());
}
else
{
keyValueClause += "," + PreparedFieldname(curr.Key) + "=" + PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
keyValueClause += "," + PreparedFieldname(curr.Key) + "= null";
}
}
added++;
}
#endregion
#region Build-UPDATE-Query-and-Submit
switch (_DbType)
{
case DbTypes.MsSql:
query = MssqlHelper.UpdateQuery(tableName, keyValueClause, filter);
break;
case DbTypes.MySql:
query = MysqlHelper.UpdateQuery(tableName, keyValueClause, filter);
break;
case DbTypes.PgSql:
query = PgsqlHelper.UpdateQuery(tableName, keyValueClause, filter);
break;
}
result = Query(query);
#endregion
return(result);
}
/// <summary>
/// Show the columns and column metadata from a specific table.
/// </summary>
/// <param name="tableName">The table to view.</param>
/// <returns>A list of column objects.</returns>
public List <Column> DescribeTable(string tableName)
{
if (String.IsNullOrEmpty(tableName))
{
throw new ArgumentNullException(nameof(tableName));
}
string query = null;
DataTable result = null;
List <Column> columns = new List <Column>();
switch (_DbType)
{
case DbTypes.MsSql:
query = MssqlHelper.LoadTableColumnsQuery(_DatabaseName, tableName);
break;
case DbTypes.MySql:
query = MysqlHelper.LoadTableColumnsQuery(_DatabaseName, tableName);
break;
case DbTypes.PgSql:
query = PgsqlHelper.LoadTableColumnsQuery(_DatabaseName, tableName);
break;
}
result = Query(query);
if (result != null && result.Rows.Count > 0)
{
foreach (DataRow currColumn in result.Rows)
{
#region Process-Each-Column
/*
* public bool PrimaryKey;
* public string Name;
* public string DataType;
* public int? MaxLength;
* public bool Nullable;
*/
Column tempColumn = new Column();
tempColumn.Name = currColumn["COLUMN_NAME"].ToString();
int maxLength = 0;
if (!Int32.TryParse(currColumn["CHARACTER_MAXIMUM_LENGTH"].ToString(), out maxLength))
{
tempColumn.MaxLength = null;
}
else
{
tempColumn.MaxLength = maxLength;
}
tempColumn.Type = DataTypeFromString(currColumn["DATA_TYPE"].ToString());
if (String.Compare(currColumn["IS_NULLABLE"].ToString(), "YES") == 0)
{
tempColumn.Nullable = true;
}
else
{
tempColumn.Nullable = false;
}
switch (_DbType)
{
case DbTypes.MsSql:
if (currColumn["CONSTRAINT_NAME"] != null &&
currColumn["CONSTRAINT_NAME"] != DBNull.Value &&
!String.IsNullOrEmpty(currColumn["CONSTRAINT_NAME"].ToString()))
{
if (currColumn["CONSTRAINT_NAME"].ToString().ToLower().StartsWith("pk"))
{
tempColumn.PrimaryKey = true;
}
}
break;
case DbTypes.MySql:
if (currColumn["COLUMN_KEY"] != null &&
currColumn["COLUMN_KEY"] != DBNull.Value &&
!String.IsNullOrEmpty(currColumn["COLUMN_KEY"].ToString()))
{
if (currColumn["COLUMN_KEY"].ToString().ToLower().Equals("pri"))
{
tempColumn.PrimaryKey = true;
}
}
break;
case DbTypes.PgSql:
if (currColumn["IS_PRIMARY_KEY"] != null &&
currColumn["IS_PRIMARY_KEY"] != DBNull.Value &&
!String.IsNullOrEmpty(currColumn["IS_PRIMARY_KEY"].ToString()))
{
if (currColumn["IS_PRIMARY_KEY"].ToString().ToLower().Equals("yes"))
{
tempColumn.PrimaryKey = true;
}
}
break;
}
if (!columns.Exists(c => c.Name.Equals(tempColumn.Name)))
{
columns.Add(tempColumn);
}
#endregion
}
}
return(columns);
}