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use odbc_sys::{SmallInt, SqlDataType, ULen}; #[derive(Clone, Copy, Debug, PartialEq, Eq)] /// Enumeration over valid SQL Data Types supported by ODBC pub enum DataType { /// The type is not known. Unknown, /// `Char(n)`. Character string of fixed length. Char { /// Column size in characters (excluding terminating zero). length: ULen, }, /// `Numeric(p,s). Signed, exact, numeric value with a precision p and scale s (1 <= p <= 15; s /// <= p) Numeric { /// Total number of digits. precision: ULen, /// Number of decimal digits. scale: SmallInt, }, /// `Decimal(p,s)`. Signed, exact, numeric value with a precision of at least p and scale s. The /// maximum precision is driver-defined. (1 <= p <= 15; s <= p) Decimal { /// Total number of digits. precision: ULen, /// Number of decimal digits. scale: SmallInt, }, /// `Integer`. 32 Bit Integer Integer, /// `Smallint`. 16 Bit Integer SmallInt, /// `Float(p)`. Signed, approximate, numeric value with a binary precision of at least p. The /// maximum precision is driver-defined. /// /// Depending on the implementation binary precision is either 24 (`f32`) or 53 (`f64`). Float, /// `Real`. Signed, approximate, numeric value with a binary precision 24 (zero or absolute /// value 10[-38] to 10[38]). Real, /// `Double Precision`. Signed, approximate, numeric value with a binary precision 53 (zero or /// absolute value 10[-308] to 10[308]). Double, /// `Varchar(n)`. Variable length character string. Varchar { /// Maximum length of the character string (excluding terminating zero). length: ULen, }, /// `Date`. Year, month, and day fields, conforming to the rules of the Gregorian calendar. Date, /// `Time`. Hour, minute, and second fields, with valid values for hours of 00 to 23, valid /// values for minutes of 00 to 59, and valid values for seconds of 00 to 61. Precision p /// indicates the seconds precision. Time { precision: SmallInt }, /// `Timestamp`. Year, month, day, hour, minute, and second fields, with valid values as defined /// for the Date and Time variants. Timestamp { precision: SmallInt }, /// `BIGINT`. Exact numeric value with precision 19 (if signed) or 20 (if unsigned) and scale 0 /// (signed: -2[63] <= n <= 2[63] - 1, unsigned: 0 <= n <= 2[64] - 1). Has no corresponding type /// in SQL-92. Bigint, /// `TINYINT`. Exact numeric value with precision 3 and scale 0 (signed: -128 <= n <= 127, /// unsigned: 0 <= n <= 255) Tinyint, /// `BIT`. Single bit binary data. Bit, /// The driver returned a type, but it is not among the other types of these enumeration. This /// is a catchall, in case the library is incomplete, or the data source supports custom or /// non-standard types. Other { /// Type of the column data_type: SqlDataType, /// Size of column element column_size: ULen, decimal_digits: SmallInt, }, } impl DataType { pub fn new(data_type: SqlDataType, column_size: ULen, decimal_digits: SmallInt) -> Self { match data_type { SqlDataType::UNKNOWN_TYPE => DataType::Unknown, SqlDataType::CHAR => DataType::Char { length: column_size, }, SqlDataType::NUMERIC => DataType::Numeric { precision: column_size, scale: decimal_digits, }, SqlDataType::DECIMAL => DataType::Decimal { precision: column_size, scale: decimal_digits, }, SqlDataType::INTEGER => DataType::Integer, SqlDataType::SMALLINT => DataType::SmallInt, SqlDataType::FLOAT => DataType::Float, SqlDataType::REAL => DataType::Real, SqlDataType::DOUBLE => DataType::Double, SqlDataType::VARCHAR => DataType::Varchar { length: column_size, }, SqlDataType::DATE => DataType::Date, SqlDataType::TIME => DataType::Time { precision: decimal_digits, }, SqlDataType::TIMESTAMP => DataType::Timestamp { precision: decimal_digits, }, SqlDataType::EXT_BIG_INT => DataType::Bigint, SqlDataType::EXT_TINY_INT => DataType::Tinyint, SqlDataType::EXT_BIT => DataType::Bit, other => DataType::Other { data_type: other, column_size, decimal_digits, }, } } } impl Default for DataType { fn default() -> Self { DataType::Unknown } }