/// <summary>
/// Create an instance of the database client.
/// </summary>
/// <param name="serverIp">The IP address or hostname of the database server.</param>
/// <param name="serverPort">The TCP port of the database server.</param>
/// <param name="username">The username to use when authenticating with the database server.</param>
/// <param name="password">The password to use when authenticating with the database server.</param>
/// <param name="database">The name of the database with which to connect.</param>
public DatabaseClient(
string serverIp,
int serverPort,
string username,
string password,
string database)
{
if (String.IsNullOrEmpty(serverIp))
{
throw new ArgumentNullException(nameof(serverIp));
}
if (serverPort < 0)
{
throw new ArgumentOutOfRangeException(nameof(serverPort));
}
if (String.IsNullOrEmpty(database))
{
throw new ArgumentNullException(nameof(database));
}
_ServerIp = serverIp;
_ServerPort = serverPort;
_Username = username;
_Password = password;
_DatabaseName = database;
_ConnectionString = PgsqlHelper.ConnectionString(_ServerIp, _ServerPort, _Username, _Password, _DatabaseName);
}
/// <summary>
/// Empties a table completely.
/// </summary>
/// <param name="tableName">The table you wish to TRUNCATE.</param>
public void Truncate(string tableName)
{
if (String.IsNullOrEmpty(tableName))
{
throw new ArgumentNullException(nameof(tableName));
}
Query(PgsqlHelper.TruncateQuery(tableName));
}
/// <summary>
/// Sanitize an input string.
/// </summary>
/// <param name="s">The value to sanitize.</param>
/// <returns>A sanitized string.</returns>
public string SanitizeString(string s)
{
if (String.IsNullOrEmpty(s))
{
return(s);
}
return(PgsqlHelper.SanitizeString(s));
}
/// <summary>
/// Execute a SELECT query.
/// </summary>
/// <param name="tableName">The table from which you wish to SELECT.</param>
/// <param name="indexStart">The starting index for retrieval; used for pagination in conjunction with maxResults and orderByClause. orderByClause example: ORDER BY created DESC.</param>
/// <param name="maxResults">The maximum number of results to retrieve.</param>
/// <param name="returnFields">The fields you wish to have returned. Null returns all.</param>
/// <param name="filter">The expression containing the SELECT filter (i.e. WHERE clause data).</param>
/// <param name="orderByClause">Specify an ORDER BY clause if desired.</param>
/// <returns>A DataTable containing the results.</returns>
public DataTable Select(string tableName, int?indexStart, int?maxResults, List <string> returnFields, Expression filter, string orderByClause)
{
if (String.IsNullOrEmpty(tableName))
{
throw new ArgumentNullException(nameof(tableName));
}
return(Query(PgsqlHelper.SelectQuery(tableName, indexStart, maxResults, returnFields, filter, orderByClause)));
}
/// <summary>
/// Execute a DELETE query.
/// </summary>
/// <param name="tableName">The table in which you wish to DELETE.</param>
/// <param name="filter">The expression containing the DELETE filter (i.e. WHERE clause data).</param>
public void Delete(string tableName, Expression filter)
{
if (String.IsNullOrEmpty(tableName))
{
throw new ArgumentNullException(nameof(tableName));
}
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
Query(PgsqlHelper.DeleteQuery(tableName, filter));
}
/// <summary>
/// Create a table with a specified name.
/// </summary>
/// <param name="tableName">The name of the table.</param>
/// <param name="columns">Columns.</param>
public void CreateTable(string tableName, List <Column> columns)
{
if (String.IsNullOrEmpty(tableName))
{
throw new ArgumentNullException(nameof(tableName));
}
if (columns == null || columns.Count < 1)
{
throw new ArgumentNullException(nameof(columns));
}
Query(PgsqlHelper.CreateTableQuery(tableName, columns));
}
/// <summary>
/// List all tables in the database.
/// </summary>
/// <returns>List of strings, each being a table name.</returns>
public List <string> ListTables()
{
List <string> tableNames = new List <string>();
DataTable result = Query(PgsqlHelper.LoadTableNamesQuery());
if (result != null && result.Rows.Count > 0)
{
foreach (DataRow curr in result.Rows)
{
tableNames.Add(curr["tablename"].ToString());
}
}
return(tableNames);
}
internal static string PreparedStringValue(string s)
{
// uses $xx$ escaping
return(PgsqlHelper.SanitizeString(s));
}
/// <summary>
/// Convert a DateTime to a formatted string.
/// </summary>
/// <param name="ts">The timestamp.</param>
/// <returns>A string formatted for use with the specified database.</returns>
public static string DbTimestamp(DateTime ts)
{
return(PgsqlHelper.DbTimestamp(ts));
}
/// <summary>
/// Execute an UPDATE query.
/// The updated rows are returned.
/// </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>DataTable containing the updated rows.</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 Build-Key-Value-Clause
string keyValueClause = "";
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 += PgsqlHelper.PreparedFieldname(curr.Key) + "='" + DbTimestamp((DateTime)curr.Value) + "'";
}
else if (curr.Value is int || curr.Value is long || curr.Value is decimal)
{
keyValueClause += PgsqlHelper.PreparedFieldname(curr.Key) + "=" + curr.Value.ToString();
}
else
{
if (Helper.IsExtendedCharacters(curr.Value.ToString()))
{
keyValueClause += PgsqlHelper.PreparedFieldname(curr.Key) + "=" + PgsqlHelper.PreparedUnicodeValue(curr.Value.ToString());
}
else
{
keyValueClause += PgsqlHelper.PreparedFieldname(curr.Key) + "=" + PgsqlHelper.PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
keyValueClause += PgsqlHelper.PreparedFieldname(curr.Key) + "= null";
}
}
else
{
if (curr.Value != null)
{
if (curr.Value is DateTime || curr.Value is DateTime?)
{
keyValueClause += "," + PgsqlHelper.PreparedFieldname(curr.Key) + "='" + DbTimestamp((DateTime)curr.Value) + "'";
}
else if (curr.Value is int || curr.Value is long || curr.Value is decimal)
{
keyValueClause += "," + PgsqlHelper.PreparedFieldname(curr.Key) + "=" + curr.Value.ToString();
}
else
{
if (Helper.IsExtendedCharacters(curr.Value.ToString()))
{
keyValueClause += "," + PgsqlHelper.PreparedFieldname(curr.Key) + "=" + PgsqlHelper.PreparedUnicodeValue(curr.Value.ToString());
}
else
{
keyValueClause += "," + PgsqlHelper.PreparedFieldname(curr.Key) + "=" + PgsqlHelper.PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
keyValueClause += "," + PgsqlHelper.PreparedFieldname(curr.Key) + "= null";
}
}
added++;
}
#endregion
#region Build-UPDATE-Query-and-Submit
return(Query(PgsqlHelper.UpdateQuery(tableName, keyValueClause, filter)));
#endregion
}
/// <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 Build-Key-Value-Pairs
string keys = "";
string values = "";
int added = 0;
foreach (KeyValuePair <string, object> curr in keyValuePairs)
{
if (String.IsNullOrEmpty(curr.Key))
{
continue;
}
if (added == 0)
{
#region First
keys += PgsqlHelper.PreparedFieldname(curr.Key);
if (curr.Value != null)
{
if (curr.Value is DateTime || curr.Value is DateTime?)
{
values += "'" + DbTimestamp((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 += PgsqlHelper.PreparedUnicodeValue(curr.Value.ToString());
}
else
{
values += PgsqlHelper.PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
values += "null";
}
#endregion
}
else
{
#region Subsequent
keys += "," + PgsqlHelper.PreparedFieldname(curr.Key);
if (curr.Value != null)
{
if (curr.Value is DateTime || curr.Value is DateTime?)
{
values += ",'" + DbTimestamp((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 += "," + PgsqlHelper.PreparedUnicodeValue(curr.Value.ToString());
}
else
{
values += "," + PgsqlHelper.PreparedStringValue(curr.Value.ToString());
}
}
}
else
{
values += ",null";
}
#endregion
}
added++;
}
#endregion
#region Build-INSERT-Query-and-Submit
return(Query(PgsqlHelper.InsertQuery(tableName, keys, values)));
#endregion
}
/// <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));
}
List <Column> columns = new List <Column>();
DataTable result = Query(PgsqlHelper.LoadTableColumnsQuery(_DatabaseName, tableName));
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();
tempColumn.MaxLength = null;
if (currColumn.Table.Columns.Contains("CHARACTER_MAXIMUM_LENGTH"))
{
int maxLength = 0;
if (Int32.TryParse(currColumn["CHARACTER_MAXIMUM_LENGTH"].ToString(), out maxLength))
{
tempColumn.MaxLength = maxLength;
}
}
tempColumn.Type = Helper.DataTypeFromString(currColumn["DATA_TYPE"].ToString());
if (currColumn.Table.Columns.Contains("IS_NULLABLE"))
{
if (String.Compare(currColumn["IS_NULLABLE"].ToString(), "YES") == 0)
{
tempColumn.Nullable = true;
}
else
{
tempColumn.Nullable = false;
}
}
else if (currColumn.Table.Columns.Contains("IS_NOT_NULLABLE"))
{
tempColumn.Nullable = !(Convert.ToBoolean(currColumn["IS_NOT_NULLABLE"]));
}
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;
}
}
if (!columns.Exists(c => c.Name.Equals(tempColumn.Name)))
{
columns.Add(tempColumn);
}
#endregion
}
}
return(columns);
}