/src/dbc/scala/dbc/datatype/Factory.scala
Scala | 250 lines | 219 code | 10 blank | 21 comment | 32 complexity | 73595430f9b2d394a7cf7f3c26527535 MD5 | raw file
- /* __ *\
- ** ________ ___ / / ___ Scala API **
- ** / __/ __// _ | / / / _ | (c) 2003-2011, LAMP/EPFL **
- ** __\ \/ /__/ __ |/ /__/ __ | **
- ** /____/\___/_/ |_/____/_/ | | **
- ** |/ **
- \* */
- package scala.dbc
- package datatype;
- import java.sql.Types._;
- import java.math.BigInteger;
- import java.math.BigDecimal;
- @deprecated(DbcIsDeprecated, "2.9.0") object Factory {
- final val java_lang_Integer_SIZE = 32;
- final val java_lang_Long_SIZE = 64;
- /** Returns a nullable property formatted as a boolean option */
- def isNullable (metadata:java.sql.ResultSetMetaData, index:Int): Option[scala.Boolean] =
- metadata.isNullable(index) match {
- case java.sql.ResultSetMetaData.columnNoNulls => Some(false);
- case java.sql.ResultSetMetaData.columnNullable => Some(true);
- case java.sql.ResultSetMetaData.columnNullableUnknown => None;
- }
-
- /** Returns the binary precision for an integer field. This should only be
- * used to find precision for integer numbers. It assumes that
- * bytes cannot be used partially (result % 8 = 0). */
- def bytePrecision (precision:Int, signed:scala.Boolean, safe:scala.Boolean): Int = {
- val decimalPrecision = precision + (if (safe) 1 else 0);
- Pair(signed,decimalPrecision) match {
- case Pair(_,0) => java.lang.Integer.MAX_VALUE // That's a bit of a hack.
- case Pair(_,dp) if (dp <= 3) => 8
- case Pair(_,dp) if (dp <= 5) => 16
- case Pair(true,dp) if (dp <= 7) => 24
- case Pair(false,dp) if (dp <= 8) => 24
- case Pair(_,dp) if (dp <= 10) => 32
- case Pair(true,dp) if (dp <= 12) => 40
- case Pair(false,dp) if (dp <= 13) => 40
- case Pair(_,dp) if (dp <= 15) => 48
- case Pair(_,dp) if (dp <= 17) => 56
- case Pair(true,dp) if (dp <= 19) => 64
- case Pair(false,dp) if (dp <= 20) => 64
- case Pair(_,dp) if (dp <= 22) => 72
- case Pair(true,dp) if (dp <= 24) => 80
- case Pair(false,dp) if (dp <= 25) => 80
- case Pair(_,dp) if (dp <= 27) => 88
- case Pair(_,dp) if (dp <= 29) => 96
- case Pair(_,dp) if (dp <= 32) => 104
- case Pair(_,dp) if (dp <= 34) => 112
- case Pair(true,dp) if (dp <= 36) => 120
- case Pair(false,dp) if (dp <= 37) => 120
- case Pair(_,dp) if (dp <= 39) => 128
- case _ => java.lang.Integer.MAX_VALUE
- }
- }
-
- def create (metadata:java.sql.ResultSetMetaData, index:Int): DataType = {
- metadata.getColumnType(index) match {
- /* Boolean data types. */
- case BOOLEAN => new datatype.Boolean {
- override val nullable = isNullable(metadata,index);
- }
- case BIT => new datatype.Boolean {
- override val nullable = isNullable(metadata,index);
- }
- /* Fixed precision numeric data types. */
- case DECIMAL => {
- Pair(bytePrecision(metadata.getPrecision(index),metadata.isSigned(index),true),metadata.getScale(index) == 0) match {
- case Pair(bp,true) if (bp <= java_lang_Integer_SIZE) =>
- new datatype.ExactNumeric[Int](DataType.INT) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- case Pair(bp,true) if (bp <= java_lang_Long_SIZE) =>
- new datatype.ExactNumeric[Long](DataType.LONG) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- case Pair(_,true) =>
- new datatype.ExactNumeric[BigInteger](DataType.BIG_INTEGER) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- case Pair(_,false) =>
- new datatype.ExactNumeric[BigDecimal](DataType.BIG_DECIMAL) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- }
- }
- case NUMERIC => {
- Pair(bytePrecision(metadata.getPrecision(index),metadata.isSigned(index),true),metadata.getScale(index) == 0) match {
- case Pair(bp,true) if (bp <= java_lang_Integer_SIZE) =>
- new datatype.ExactNumeric[Int](DataType.INT) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- case Pair(bp,true) if (bp <= java_lang_Long_SIZE) =>
- new datatype.ExactNumeric[Long](DataType.LONG) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- case Pair(_,true) =>
- new datatype.ExactNumeric[BigInteger](DataType.BIG_INTEGER) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- case Pair(_,false) =>
- new datatype.ExactNumeric[BigDecimal](DataType.BIG_DECIMAL) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 10;
- val precision = metadata.getPrecision(index);
- val signed = metadata.isSigned(index);
- val scale = metadata.getScale(index);
- }
- }
- }
- /* Fixed precision integer data types. */
- case BIGINT =>
- new datatype.ExactNumeric[Long](DataType.LONG) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 2;
- val precision = 64;
- val signed = metadata.isSigned(index);
- val scale = 0;
- }
- case INTEGER =>
- new datatype.ExactNumeric[Int](DataType.INT) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 2;
- val precision = 32;
- val signed = metadata.isSigned(index);
- val scale = 0;
- }
- case SMALLINT =>
- new datatype.ExactNumeric[Short](DataType.SHORT) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 2;
- val precision = 16;
- val signed = metadata.isSigned(index);
- val scale = 0;
- }
- case TINYINT =>
- new datatype.ExactNumeric[Byte](DataType.BYTE) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 2;
- val precision = 8;
- val signed = metadata.isSigned(index);
- val scale = 0;
- }
- /* Floating point numeric data types. */
- case REAL =>
- new datatype.ApproximateNumeric[Float](DataType.FLOAT) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 2;
- val precision = 64;
- val signed = metadata.isSigned(index);
- }
- case DOUBLE =>
- new datatype.ApproximateNumeric[Double](DataType.DOUBLE) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 2;
- val precision = 128;
- val signed = metadata.isSigned(index);
- }
- case FLOAT =>
- new datatype.ApproximateNumeric[Double](DataType.DOUBLE) {
- override val nullable = isNullable(metadata,index);
- val precisionRadix = 2;
- val precision = 128;
- val signed = metadata.isSigned(index);
- }
- /* Character string data types. */
- case CHAR => new datatype.Character {
- override val nullable = isNullable(metadata,index);
- val length = metadata.getColumnDisplaySize(index);
- }
- case CLOB => new datatype.CharacterLargeObject {
- override val nullable = isNullable(metadata,index);
- }
- case LONGVARCHAR => {
- if (metadata.getColumnDisplaySize(index) >= 0)
- new datatype.CharacterVarying {
- override val nullable = isNullable(metadata,index);
- def length = metadata.getColumnDisplaySize(index);
- }
- else // A PostgreSQL Hack
- new datatype.CharacterLargeObject {
- override val nullable = isNullable(metadata,index);
- }
- }
- case VARCHAR => {
- if (metadata.getColumnDisplaySize(index) >= 0)
- new datatype.CharacterVarying {
- override val nullable = isNullable(metadata,index);
- def length = metadata.getColumnDisplaySize(index);
- }
- else // A PostgreSQL Hack
- new datatype.CharacterLargeObject {
- override val nullable = isNullable(metadata,index);
- }
- }
- /* Undefined cases. */
- case OTHER => new datatype.Unknown {
- override val nullable = isNullable(metadata, index);
- }
- /* Unsupported data types. */
- case REF | ARRAY | STRUCT =>
- sys.error ("I don't support composite data types yet.");
- case DATALINK | DISTINCT | JAVA_OBJECT | NULL =>
- sys.error ("I won't support strange data types.");
- /* Unsupported binary string data types. */
- case BINARY | BLOB | LONGVARBINARY | VARBINARY =>
- sys.error ("I don't support binary string data types yet.");
- /* Unsupported date and time data types. */
- case DATE | TIME | TIMESTAMP =>
- sys.error ("I don't support date and time data types yet.");
- /* Default case */
- case x => sys.error ("I don't know about this ("+metadata.getColumnTypeName(index)+") JDBC type.")
- }
- }
- }