Python sqlalchemy.types 模块，TEXT 实例源码

def __init__(self, length=None, **kw):
        """Construct a TEXT.

        :param length: Optional, if provided the server may optimize storage
          by substituting the smallest TEXT type sufficient to store
          ``length`` characters.

        :param collation: Optional, a column-level collation for this string
          value.  Takes precedence to 'binary' short-hand.

        :param binary: Defaults to False: short-hand, pick the binary
          collation type that matches the column's character set.  Generates
          BINARY in schema.  This does not affect the type of data stored,
          only the collation of character data.

        """

        super(TEXT, self).__init__(length=length, **kw)

def __init__(self, length=None, **kw):
        """Construct a TEXT.

        :param length: Optional, if provided the server may optimize storage
          by substituting the smallest TEXT type sufficient to store
          ``length`` characters.

        :param collation: Optional, a column-level collation for this string
          value.  Takes precedence to 'binary' short-hand.

        :param binary: Defaults to False: short-hand, pick the binary
          collation type that matches the column's character set.  Generates
          BINARY in schema.  This does not affect the type of data stored,
          only the collation of character data.

        """

        super(TEXT, self).__init__(length=length, **kw)

def __init__(self, length=None, **kw):
        """Construct a TEXT.

        :param length: Optional, if provided the server may optimize storage
          by substituting the smallest TEXT type sufficient to store
          ``length`` characters.

        :param collation: Optional, a column-level collation for this string
          value.  Takes precedence to 'binary' short-hand.

        :param binary: Defaults to False: short-hand, pick the binary
          collation type that matches the column's character set.  Generates
          BINARY in schema.  This does not affect the type of data stored,
          only the collation of character data.

        """

        super(TEXT, self).__init__(length=length, **kw)

def str_to_sqltype(expr):
    import re
    import sqlalchemy.types as sqltypes
    norm_expr = expr.lower()
    if norm_expr.startswith('integer'):
        match_result = re.match(r'integer\((\d+)\)', norm_expr)
        if match_result is not None:
            return sqltypes.BIGINT() if int(match_result.group(1)) > 11 else sqltypes.INTEGER()
        return sqltypes.BIGINT()
    if norm_expr == 'decimal':
        return sqltypes.DECIMAL()
    if norm_expr == 'date':
        return sqltypes.DATETIME()
    if norm_expr == 'bool' or norm_expr == 'boolean':
        return sqltypes.BOOLEAN()
    if norm_expr.startswith('string'):
        match_result = re.match(r'string\((\d+)\)', norm_expr)
        if match_result is not None:
            maxlen = int(match_result.group(1))
            return sqltypes.VARCHAR(maxlen) if maxlen < 65536 else sqltypes.TEXT
        return sqltypes.TEXT()
    raise RuntimeError("Unsupported data type [" + expr + "]")

def get_col_spec(self):
        return "TEXT"

def get_col_spec(self):
        return "TEXT"

def get_col_spec(self):
        return "TEXT"

def sqltype_to_stdtype(sqltype):
    import sqlalchemy.types as sqltypes
    if isinstance(sqltype, (sqltypes.VARCHAR, sqltypes.CHAR, sqltypes.TEXT, sqltypes.Enum, sqltypes.String)):
        return _STRING_TYPE
    if isinstance(sqltype, (sqltypes.DATETIME, sqltypes.DATE, sqltypes.TIME, sqltypes.TIMESTAMP)):
        return _DATE_TYPE
    if isinstance(sqltype, (sqltypes.INTEGER, sqltypes.BIGINT, sqltypes.SMALLINT, sqltypes.Integer)):
        return _INTEGER_TYPE
    if isinstance(sqltype, (sqltypes.REAL, sqltypes.DECIMAL, sqltypes.NUMERIC, sqltypes.FLOAT)):
        return _DECIMAL_TYPE
    if isinstance(sqltype, sqltypes.BOOLEAN):
        return _BOOLEAN_TYPE

def stdtype_to_sqltype(stdtype):
    import sqlalchemy.types as sqltypes
    if isinstance(stdtype, stdtypes.StringType):
        return sqltypes.VARCHAR(length=stdtype.max_len) if 0 < stdtype.max_len < 65536 else sqltypes.TEXT()
    if isinstance(stdtype, stdtypes.BoolType):
        return sqltypes.BOOLEAN()
    if isinstance(stdtype, stdtypes.DateType):
        return sqltypes.DATE() if stdtype.only_date else sqltypes.TIMESTAMP()
    if isinstance(stdtype, stdtypes.IntegerType):
        return sqltypes.BIGINT() if stdtype.length > 11 else sqltypes.INTEGER()
    if isinstance(stdtype, stdtypes.DecimalType):
        return sqltypes.DECIMAL()
    if isinstance(stdtype, stdtypes.ArrayType):
        return sqltypes.ARRAY(item_type=stdtype.item_type)