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package oracle.toplink.essentials.platform.database;
import java.io.*;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.internal.databaseaccess.*;
import oracle.toplink.essentials.queryframework.*;
/**
* <p><b>Purpose</b>: Provides Informix specific behaviour.
* <p><b>Responsibilities</b>:<ul>
* <li> Types for schema creation.
* <li> Native sequencing using @@SERIAL.
* </ul>
*
* @since TOPLink/Java 1.0.1
*/
public class InformixPlatform extends oracle.toplink.essentials.platform.database.DatabasePlatform {
/**
* INTERNAL:
* Answer a platform correct string representation of a Date, suitable for SQL generation.
* Native format: 'yyyy-mm-dd
*/
protected void appendDate(java.sql.Date date, Writer writer) throws IOException {
if (usesNativeSQL()) {
writer.write("'");
writer.write(Helper.printDate(date));
writer.write("'");
} else {
super.appendDate(date, writer);
}
}
/**
* INTERNAL:
* Write a timestamp in Informix specific format (yyyy-mm-dd hh:mm:ss.fff).
*/
protected void appendInformixTimestamp(java.sql.Timestamp timestamp, Writer writer) throws IOException {
writer.write("'");
writer.write(Helper.printTimestampWithoutNanos(timestamp));
writer.write('.');
// Must truncate the nanos to three decimal places,
// it is actually a complex algorithm...
String nanoString = Integer.toString(timestamp.getNanos());
int numberOfZeros = 0;
for (int num = Math.min(9 - nanoString.length(), 3); num > 0; num--) {
writer.write('0');
numberOfZeros++;
}
if ((nanoString.length() + numberOfZeros) > 3) {
nanoString = nanoString.substring(0, (3 - numberOfZeros));
}
writer.write(nanoString);
writer.write("'");
}
/**
* INTERNAL:
* Answer a platform correct string representation of a Calendar, suitable for SQL generation.
* The date is printed in the ODBC platform independent format {d'YYYY-MM-DD'}.
*/
protected void appendCalendar(Calendar calendar, Writer writer) throws IOException {
if (usesNativeSQL()) {
appendInformixCalendar(calendar, writer);
} else {
super.appendCalendar(calendar, writer);
}
}
/**
* INTERNAL:
* Write a timestamp in Informix specific format ( yyyy-mm-dd hh:mm:ss.fff)
*/
protected void appendInformixCalendar(Calendar calendar, Writer writer) throws IOException {
writer.write("'");
writer.write(Helper.printCalendar(calendar));
writer.write("'");
}
/**
* INTERNAL:
* Answer a platform correct string representation of a Time, suitable for SQL generation.
* The time is printed in the ODBC platform independent format {t'hh:mm:ss'}.
*/
protected void appendTime(java.sql.Time time, Writer writer) throws IOException {
if (usesNativeSQL()) {
writer.write("'");
writer.write(Helper.printTime(time));
writer.write("'");
} else {
super.appendTime(time, writer);
}
}
/**
* INTERNAL:
* Answer a platform correct string representation of a Timestamp, suitable for SQL generation.
* The date is printed in the ODBC platform independent format {d'YYYY-MM-DD'}.
*/
protected void appendTimestamp(java.sql.Timestamp timestamp, Writer writer) throws IOException {
if (usesNativeSQL()) {
appendInformixTimestamp(timestamp, writer);
} else {
super.appendTimestamp(timestamp, writer);
}
}
protected Hashtable buildFieldTypes() {
Hashtable fieldTypeMapping;
fieldTypeMapping = new Hashtable();
fieldTypeMapping.put(Boolean.class, new FieldTypeDefinition("SMALLINT default 0", false));
fieldTypeMapping.put(Integer.class, new FieldTypeDefinition("INTEGER", false));
fieldTypeMapping.put(Long.class, new FieldTypeDefinition("NUMERIC", 19));
fieldTypeMapping.put(Float.class, new FieldTypeDefinition("FLOAT(16)", false));
fieldTypeMapping.put(Double.class, new FieldTypeDefinition("FLOAT(32)", false));
fieldTypeMapping.put(Short.class, new FieldTypeDefinition("SMALLINT", false));
fieldTypeMapping.put(Byte.class, new FieldTypeDefinition("SMALLINT", false));
fieldTypeMapping.put(java.math.BigInteger.class, new FieldTypeDefinition("DECIMAL", 32));
fieldTypeMapping.put(java.math.BigDecimal.class, new FieldTypeDefinition("DECIMAL", 32).setLimits(32, -19, 19));
fieldTypeMapping.put(Number.class, new FieldTypeDefinition("DECIMAL", 32).setLimits(32, -19, 19));
fieldTypeMapping.put(String.class, new FieldTypeDefinition("VARCHAR", 255));
fieldTypeMapping.put(Character.class, new FieldTypeDefinition("CHAR", 1));
fieldTypeMapping.put(Byte[].class, new FieldTypeDefinition("BYTE", false));
fieldTypeMapping.put(Character[].class, new FieldTypeDefinition("TEXT", false));
fieldTypeMapping.put(byte[].class, new FieldTypeDefinition("BYTE", false));
fieldTypeMapping.put(char[].class, new FieldTypeDefinition("TEXT", false));
fieldTypeMapping.put(java.sql.Blob.class, new FieldTypeDefinition("BYTE", false));
fieldTypeMapping.put(java.sql.Clob.class, new FieldTypeDefinition("TEXT", false));
fieldTypeMapping.put(java.sql.Date.class, new FieldTypeDefinition("DATE", false));
fieldTypeMapping.put(java.sql.Time.class, new FieldTypeDefinition("DATETIME HOUR TO SECOND", false));
fieldTypeMapping.put(java.sql.Timestamp.class, new FieldTypeDefinition("DATETIME YEAR TO FRACTION(5)", false));
return fieldTypeMapping;
}
/**
* INTERNAL:
* Build the identity query for native sequencing.
*/
public ValueReadQuery buildSelectQueryForNativeSequence() {
ValueReadQuery selectQuery = new ValueReadQuery();
StringWriter writer = new StringWriter();
writer.write("SELECT DISTINCT(DBINFO('sqlca.sqlerrd1')) FROM systables");
selectQuery.setSQLString(writer.toString());
return selectQuery;
}
/**
* INTERNAL:
* returns the maximum number of characters that can be used in a field
* name on this platform.
*/
public int getMaxFieldNameSize() {
return 18;
}
/**
* INTERNAL:
* Informix seems to like this syntax instead of the OF * syntax.
*/
public String getSelectForUpdateString() {
return " FOR UPDATE";
}
public boolean isInformix() {
return true;
}
/**
* INTERNAL:
* Some database require outer joins to be given in the where clause, others require it in the from clause.
* Informix requires it in the from clause with no ON expression.
*/
public boolean isInformixOuterJoin() {
return true;
}
/**
* INTERNAL:
* Builds a table of maximum numeric values keyed on java class. This is used for type testing but
* might also be useful to end users attempting to sanitize values.
* <p><b>NOTE</b>: BigInteger & BigDecimal maximums are dependent upon their precision & Scale
*/
public Hashtable maximumNumericValues() {
Hashtable values = new Hashtable();
values.put(Integer.class, new Integer(Integer.MAX_VALUE));
values.put(Long.class, new Long(Long.MAX_VALUE));
values.put(Double.class, new Double((double)Float.MAX_VALUE));
values.put(Short.class, new Short(Short.MAX_VALUE));
values.put(Byte.class, new Byte(Byte.MAX_VALUE));
values.put(Float.class, new Float(Float.MAX_VALUE));
values.put(java.math.BigInteger.class, new java.math.BigInteger("99999999999999999999999999999999999999"));
values.put(java.math.BigDecimal.class, new java.math.BigDecimal("9999999999999999999.9999999999999999999"));
return values;
}
/**
* INTERNAL:
* Builds a table of minimum numeric values keyed on java class. This is used for type testing but
* might also be useful to end users attempting to sanitize values.
* <p><b>NOTE</b>: BigInteger & BigDecimal minimums are dependent upon their precision & Scale
*/
public Hashtable minimumNumericValues() {
Hashtable values = new Hashtable();
values.put(Integer.class, new Integer(Integer.MIN_VALUE));
values.put(Long.class, new Long(Long.MIN_VALUE));
values.put(Double.class, new Double((double)1.4012984643247149E-44));// The double values are weird. They lose precision at E-45
values.put(Short.class, new Short(Short.MIN_VALUE));
values.put(Byte.class, new Byte(Byte.MIN_VALUE));
values.put(Float.class, new Float(Float.MIN_VALUE));
values.put(java.math.BigInteger.class, new java.math.BigInteger("-99999999999999999999999999999999999999"));
values.put(java.math.BigDecimal.class, new java.math.BigDecimal("-9999999999999999999.9999999999999999999"));
return values;
}
/**
* INTERNAL:
* Append the receiver's field serial constraint clause to a writer.
*/
public void printFieldIdentityClause(Writer writer) throws ValidationException {
try {
writer.write(" SERIAL");
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
}
/**
* INTERNAL:
* USed for sp calls.
*/
public boolean requiresProcedureCallBrackets() {
return false;
}
/**
* INTERNAL:
* If native sequencing is being used on Informix then the values must be
* retrieved after the insert.
* This method is to be used *ONLY* by sequencing classes
*/
public boolean shouldNativeSequenceAcquireValueAfterInsert() {
return true;
}
/**
* INTERNAL:
* Some Platforms want the constraint name after the constraint definition.
*/
public boolean shouldPrintConstraintNameAfter() {
return true;
}
/**
* INTERNAL:
* Some database require outer joins to be given in the where clause, others require it in the from clause.
*/
public boolean shouldPrintOuterJoinInWhereClause() {
return false;
}
/**
* INTERNAL:
* Return true if the receiver uses host sequence numbers, generated on the database.
* Informix does this through SERIAL field types.
*/
public boolean supportsNativeSequenceNumbers() {
return true;
}
}
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