public static void ReadSchema(IDataBase driver, ClassDefinition table)
{
IDbConnection connection = driver.getConnection();
try
{
DataTable schema = new DataTable();
if (connection.GetType() == typeof(NpgsqlConnection))
{
NpgsqlCommand command = driver.getCommand("SELECT * FROM \"" + table.Table + "\"") as NpgsqlCommand;
NpgsqlDataAdapter adapter = driver.getDataAdapter(command) as NpgsqlDataAdapter;
adapter.FillSchema(schema, SchemaType.Source);
}
else
{
DbCommand command = driver.getCommand("SELECT * FROM \"" + table.Table + "\"");
DbDataAdapter adapter = driver.getDataAdapter(command) as DbDataAdapter;
adapter.FillSchema(schema, SchemaType.Source);
}
foreach (DataColumn c in schema.Columns)
{
table.Columns.Add(new FieldDefinition(c.ColumnName, c.DataType));
}
foreach (DataColumn pk in schema.PrimaryKey)
{
foreach (FieldDefinition field in table.Columns)
if (field.ColumnName.Equals(pk.ColumnName))
field.PrimaryKey = true;
}
if (connection.GetType() == typeof(NpgsqlConnection))
{
NpgsqlCommand command = driver.getCommand(@"SELECT
tc.constraint_schema, tc.constraint_name,
kcu.table_schema, kcu.table_name, kcu.column_name,
ctu.table_schema as dest_table_schema,
ctu.table_name as dest_table_name,
ccu.column_name as dest_column_name
FROM information_schema.table_constraints tc
INNER JOIN information_schema.constraint_table_usage ctu ON ctu.constraint_name = tc.constraint_name
INNER JOIN information_schema.constraint_column_usage ccu ON ccu.constraint_name = tc.constraint_name
INNER JOIN information_schema.key_column_usage kcu ON kcu.constraint_name = tc.constraint_name
WHERE tc.constraint_type = 'FOREIGN KEY' AND tc.table_name = '" + table + "';") as NpgsqlCommand;
DbDataReader dr = command.ExecuteReader();
while (dr.Read())
{
foreach (FieldDefinition field in table.Columns)
if (field.ColumnName.Equals(dr["column_name"].ToString()))
{
field.ForeignKey = true;
field.ForeignKeyType = dr["dest_table_name"].ToString();
}
}
}
}
finally
{
connection.Close();
connection.Dispose();
}
}
