/// <summary>
/// Parse a single table column row.
/// </summary>
/// <param name="sql">The SQL statement</param>
/// <returns>The DbColumn instance for the column.</returns>
private static DbColumn ParseColumn(ref string sql)
{
// In case this is a PRIMARY KEY constraint - return null immediatly
if (sql.TrimStart(' ', '\t', '\n', '\r').StartsWith("PRIMARY KEY"))
{
return(null);
}
string columnName = null;
DbType columnType = DbType.Int32;
int columnSize = -1;
int columnPrecision = -1;
DbColumn res = new DbColumn();
if (ParseColumnNameType(ref sql, ref columnName, ref columnType, ref columnSize, ref columnPrecision))
{
res.ColumnName = columnName;
res.ColumnSize = columnSize;
res.ColumnType = columnType;
res.ColumnPrecision = columnPrecision;
int index = FindClosingRightParens(sql);
if (index == -1)
{
throw DbUpgradeException.SchemaIsNotSupported();
}
int index2 = sql.IndexOf(",");
if (index2 != -1 && index2 < index)
{
index = index2;
}
string rest = sql.Substring(0, index);
sql = sql.Substring(index);
// TRUE by default
res.IsNullable = true;
// Parse the list of column constraints
Match m = _columnConstraints.Match(rest);
while (m.Success)
{
if (m.Groups[2].Success)
{
if (m.Groups[2].Value == "NOT NULL")
{
res.IsNullable = false;
}
else
{
res.IsNullable = true;
}
}
else if (m.Groups[1].Success)
{
res.IsPrimaryKey = true;
}
else if (m.Groups[5].Success)
{
res.DefaultValue = null;
res.DefaultFunction = m.Groups[5].Value;
}
else if (m.Groups[7].Success)
{
res.DefaultValue = m.Groups[7].Value;
res.DefaultFunction = null;
}
else if (m.Groups[9].Success)
{
res.DefaultValue = double.Parse(m.Groups[9].Value);
res.DefaultFunction = null;
}
else if (m.Groups[11].Success)
{
res.DefaultValue = int.Parse(m.Groups[11].Value);
res.DefaultFunction = null;
}
else if (m.Groups[13].Success)
{
res.Collation = m.Groups[13].Value;
}
else if (m.Groups[14].Success)
{
res.IsUnique = true;
}
else if (m.Groups[15].Success)
{
res.IsAutoIncrement = true;
}
else
{
throw DbUpgradeException.InternalSoftwareError();
}
rest = rest.Substring(m.Index + m.Length);
m = _columnConstraints.Match(rest);
} // while
return(res);
} // if
else
{
// This is not a column - maybe it is a primary key declaration
return(null);
} // else
}
/// <summary>
/// Parse the table columns section of the CREATE TABLE DDL statement.
/// </summary>
/// <param name="sql">The SQL statement to parse</param>
/// <param name="tableName">Name of the table.</param>
/// <returns>
/// The list of DbColumn objects that represent the meta
/// data about all table columns.
/// </returns>
public static List <DbColumn> ParseTableColumns(ref string sql, string tableName)
{
// Skip '('
if (!ScanToken(ref sql, "("))
{
throw DbUpgradeException.SchemaIsNotSupported();
}
List <string> primaryKeys = new List <string>();
List <DbColumn> res = new List <DbColumn>();
do
{
if (sql.Trim().StartsWith(")"))
{
break;
}
DbColumn col = ParseColumn(ref sql);
if (col != null)
{
res.Add(col);
if (!ScanToken(ref sql, ","))
{
if (ScanToken(ref sql, ")"))
{
break;
}
else
{
DbUpgradeException.SchemaIsNotSupported();
}
} // if
}
else
{
// Try to parse as a PRIMARY KEY section
List <string> keys = ParsePrimaryKeys(ref sql);
if (keys != null)
{
primaryKeys.AddRange(keys);
}
else
{
throw DbUpgradeException.SchemaIsNotSupported();
}
} // else
} while (true);
// Apply any primary keys found
foreach (string pkey in primaryKeys)
{
bool found = false;
foreach (DbColumn col in res)
{
if (col.ColumnName == pkey)
{
col.IsPrimaryKey = true;
found = true;
break;
}
} // foreach
if (!found)
{
throw DbUpgradeException.InvalidPrimaryKeySection(tableName);
}
} // foreach
return(res);
}
