private MyCatSchemaCollection GetTable(string sql)
{
MyCatSchemaCollection c = new MyCatSchemaCollection();
MyCatCommand cmd = new MyCatCommand(sql, connection);
MyCatDataReader reader = cmd.ExecuteReader();
// add columns
for (int i = 0; i < reader.FieldCount; i++)
{
c.AddColumn(reader.GetName(i), reader.GetFieldType(i));
}
using (reader)
{
while (reader.Read())
{
MyCatSchemaRow row = c.AddRow();
for (int i = 0; i < reader.FieldCount; i++)
{
row[i] = reader.GetValue(i);
}
}
}
return(c);
}
internal void ProcessOutputParameters(MyCatDataReader reader)
{
// We apparently need to always adjust our output types since the server
// provided data types are not always right
AdjustOutputTypes(reader);
if ((reader.CommandBehavior & CommandBehavior.SchemaOnly) != 0)
{
return;
}
// now read the output parameters data row
reader.Read();
string prefix = "@" + StoredProcedure.ParameterPrefix;
for (int i = 0; i < reader.FieldCount; i++)
{
string fieldName = reader.GetName(i);
if (fieldName.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
{
fieldName = fieldName.Remove(0, prefix.Length);
}
MyCatParameter parameter = command.Parameters.GetParameterFlexible(fieldName, true);
parameter.Value = reader.GetValue(i);
}
}
private void LoadTableColumns(MyCatSchemaCollection schemaCollection, string schema,
string tableName, string columnRestriction)
{
string sql = String.Format("SHOW FULL COLUMNS FROM `{0}`.`{1}`",
schema, tableName);
MyCatCommand cmd = new MyCatCommand(sql, connection);
int pos = 1;
using (MyCatDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
string colName = reader.GetString(0);
if (columnRestriction != null && colName != columnRestriction)
{
continue;
}
MyCatSchemaRow row = schemaCollection.AddRow();
row["TABLE_CATALOG"] = DBNull.Value;
row["TABLE_SCHEMA"] = schema;
row["TABLE_NAME"] = tableName;
row["COLUMN_NAME"] = colName;
row["ORDINAL_POSITION"] = pos++;
row["COLUMN_DEFAULT"] = reader.GetValue(5);
row["IS_NULLABLE"] = reader.GetString(3);
row["DATA_TYPE"] = reader.GetString(1);
row["CHARACTER_MAXIMUM_LENGTH"] = DBNull.Value;
row["CHARACTER_OCTET_LENGTH"] = DBNull.Value;
row["NUMERIC_PRECISION"] = DBNull.Value;
row["NUMERIC_SCALE"] = DBNull.Value;
row["CHARACTER_SET_NAME"] = reader.GetValue(2);
row["COLLATION_NAME"] = row["CHARACTER_SET_NAME"];
row["COLUMN_TYPE"] = reader.GetString(1);
row["COLUMN_KEY"] = reader.GetString(4);
row["EXTRA"] = reader.GetString(6);
row["PRIVILEGES"] = reader.GetString(7);
row["COLUMN_COMMENT"] = reader.GetString(8);
ParseColumnRow(row);
}
}
}
internal static void InitCollections(MyCatConnection connection)
{
defaultCollations = new Dictionary <string, string>();
maxLengths = new Dictionary <string, int>();
MyCatCommand cmd = new MyCatCommand("SHOW CHARSET", connection);
using (MyCatDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
defaultCollations.Add(reader.GetString(0), reader.GetString(2));
maxLengths.Add(reader.GetString(0), Convert.ToInt32(reader.GetValue(3)));
}
}
}
/// <include file='docs/mysqlcommand.xml' path='docs/ExecuteScalar/*'/>
public override object ExecuteScalar()
{
lastInsertedId = -1;
object val = null;
#if !NETSTANDARD1_3
// give our interceptors a shot at it first
if (connection != null &&
connection.commandInterceptor.ExecuteScalar(CommandText, ref val))
{
return(val);
}
#endif
using (MyCatDataReader reader = ExecuteReader())
{
if (reader.Read())
{
val = reader.GetValue(0);
}
}
return(val);
}
private void FindTables(MyCatSchemaCollection schema, string[] restrictions)
{
StringBuilder sql = new StringBuilder();
StringBuilder where = new StringBuilder();
sql.AppendFormat(CultureInfo.InvariantCulture,
"SHOW TABLE STATUS FROM `{0}`", restrictions[1]);
if (restrictions != null && restrictions.Length >= 3 &&
restrictions[2] != null)
{
where.AppendFormat(CultureInfo.InvariantCulture,
" LIKE '{0}'", restrictions[2]);
}
sql.Append(where.ToString());
string table_type = restrictions[1].ToLower() == "information_schema"
?
"SYSTEM VIEW"
: "BASE TABLE";
MyCatCommand cmd = new MyCatCommand(sql.ToString(), connection);
using (MyCatDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
MyCatSchemaRow row = schema.AddRow();
row["TABLE_CATALOG"] = null;
row["TABLE_SCHEMA"] = restrictions[1];
row["TABLE_NAME"] = reader.GetString(0);
row["TABLE_TYPE"] = table_type;
row["ENGINE"] = GetString(reader, 1);
row["VERSION"] = reader.GetValue(2);
row["ROW_FORMAT"] = GetString(reader, 3);
row["TABLE_ROWS"] = reader.GetValue(4);
row["AVG_ROW_LENGTH"] = reader.GetValue(5);
row["DATA_LENGTH"] = reader.GetValue(6);
row["MAX_DATA_LENGTH"] = reader.GetValue(7);
row["INDEX_LENGTH"] = reader.GetValue(8);
row["DATA_FREE"] = reader.GetValue(9);
row["AUTO_INCREMENT"] = reader.GetValue(10);
row["CREATE_TIME"] = reader.GetValue(11);
row["UPDATE_TIME"] = reader.GetValue(12);
row["CHECK_TIME"] = reader.GetValue(13);
row["TABLE_COLLATION"] = GetString(reader, 14);
row["CHECKSUM"] = reader.GetValue(15);
row["CREATE_OPTIONS"] = GetString(reader, 16);
row["TABLE_COMMENT"] = GetString(reader, 17);
}
}
}
public virtual MyCatSchemaCollection GetIndexColumns(string[] restrictions)
{
MyCatSchemaCollection dt = new MyCatSchemaCollection("IndexColumns");
dt.AddColumn("INDEX_CATALOG", typeof(string));
dt.AddColumn("INDEX_SCHEMA", typeof(string));
dt.AddColumn("INDEX_NAME", typeof(string));
dt.AddColumn("TABLE_NAME", typeof(string));
dt.AddColumn("COLUMN_NAME", typeof(string));
dt.AddColumn("ORDINAL_POSITION", typeof(int));
dt.AddColumn("SORT_ORDER", typeof(string));
int max = restrictions == null ? 4 : restrictions.Length;
string[] tableRestrictions = new string[Math.Max(max, 4)];
if (restrictions != null)
{
restrictions.CopyTo(tableRestrictions, 0);
}
tableRestrictions[3] = "BASE TABLE";
MyCatSchemaCollection tables = GetTables(tableRestrictions);
foreach (MyCatSchemaRow table in tables.Rows)
{
string sql = String.Format("SHOW INDEX FROM `{0}`.`{1}`",
table["TABLE_SCHEMA"], table["TABLE_NAME"]);
MyCatCommand cmd = new MyCatCommand(sql, connection);
using (MyCatDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
string key_name = GetString(reader, reader.GetOrdinal("KEY_NAME"));
string col_name = GetString(reader, reader.GetOrdinal("COLUMN_NAME"));
if (restrictions != null)
{
if (restrictions.Length >= 4 && restrictions[3] != null &&
key_name != restrictions[3])
{
continue;
}
if (restrictions.Length >= 5 && restrictions[4] != null &&
col_name != restrictions[4])
{
continue;
}
}
MyCatSchemaRow row = dt.AddRow();
row["INDEX_CATALOG"] = null;
row["INDEX_SCHEMA"] = table["TABLE_SCHEMA"];
row["INDEX_NAME"] = key_name;
row["TABLE_NAME"] = GetString(reader, reader.GetOrdinal("TABLE"));
row["COLUMN_NAME"] = col_name;
row["ORDINAL_POSITION"] = reader.GetValue(reader.GetOrdinal("SEQ_IN_INDEX"));
row["SORT_ORDER"] = reader.GetString("COLLATION");
}
}
}
return(dt);
}