/*
* Created on Aug 24, 2005
* This is the Hibernate dialect for the Unisys 2200 Relational Database (RDMS).
* This dialect was developed for use with Hibernate 3.0.5. Other versions may
* require modifications to the dialect.
*
* Version History:
* Also change the version displayed below in the constructor
* 1.1
* 1.0 2005-10-24 CDH - First dated version for use with CP 11
*/
package org.hibernate.dialect;
import org.hibernate.dialect.function.NoArgSQLFunction;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.lock.LockingStrategy;
import org.hibernate.dialect.lock.UpdateLockingStrategy;
import org.hibernate.dialect.lock.SelectLockingStrategy;
import java.sql.Types;
import org.hibernate.Hibernate;
import org.hibernate.LockMode;
import org.hibernate.persister.entity.Lockable;
import org.hibernate.sql.CaseFragment;
import org.hibernate.sql.DecodeCaseFragment;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* @author Ploski and Hanson
*/
public class RDMSOS2200Dialect extends Dialect {
private static Log log = LogFactory.getLog(RDMSOS2200Dialect.class);
public RDMSOS2200Dialect() {
super();
// Display the dialect version.
log.info("RDMSOS2200Dialect version: 1.0");
/**
* This section registers RDMS Biult-in Functions (BIFs) with Hibernate.
* The first parameter is the 'register' function name with Hibernate.
* The second parameter is the defined RDMS SQL Function and it's
* characteristics. If StandardSQLFunction(...) is used, the RDMS BIF
* name and the return type (if any) is specified. If
* SQLFunctionTemplate(...) is used, the return type and a template
* string is provided, plus an optional hasParenthesesIfNoArgs flag.
*/
registerFunction( "abs", new StandardSQLFunction("abs") );
registerFunction( "sign", new StandardSQLFunction("sign", Hibernate.INTEGER) );
registerFunction("ascii", new StandardSQLFunction("ascii", Hibernate.INTEGER) );
registerFunction("char_length", new StandardSQLFunction("char_length", Hibernate.INTEGER) );
registerFunction("character_length", new StandardSQLFunction("character_length", Hibernate.INTEGER) );
registerFunction("length", new StandardSQLFunction("length", Hibernate.INTEGER) );
// The RDMS concat() function only supports 2 parameters
registerFunction( "concat", new SQLFunctionTemplate(Hibernate.STRING, "concat(?1, ?2)") );
registerFunction( "instr", new StandardSQLFunction("instr", Hibernate.STRING) );
registerFunction( "lpad", new StandardSQLFunction("lpad", Hibernate.STRING) );
registerFunction( "replace", new StandardSQLFunction("replace", Hibernate.STRING) );
registerFunction( "rpad", new StandardSQLFunction("rpad", Hibernate.STRING) );
registerFunction( "substr", new StandardSQLFunction("substr", Hibernate.STRING) );
registerFunction("lcase", new StandardSQLFunction("lcase") );
registerFunction("lower", new StandardSQLFunction("lower") );
registerFunction("ltrim", new StandardSQLFunction("ltrim") );
registerFunction("reverse", new StandardSQLFunction("reverse") );
registerFunction("rtrim", new StandardSQLFunction("rtrim") );
// RDMS does not directly support the trim() function, we use rtrim() and ltrim()
registerFunction("trim", new SQLFunctionTemplate(Hibernate.INTEGER, "ltrim(rtrim(?1))" ) );
registerFunction("soundex", new StandardSQLFunction("soundex") );
registerFunction("space", new StandardSQLFunction("space", Hibernate.STRING) );
registerFunction("ucase", new StandardSQLFunction("ucase") );
registerFunction("upper", new StandardSQLFunction("upper") );
registerFunction("acos", new StandardSQLFunction("acos", Hibernate.DOUBLE) );
registerFunction("asin", new StandardSQLFunction("asin", Hibernate.DOUBLE) );
registerFunction("atan", new StandardSQLFunction("atan", Hibernate.DOUBLE) );
registerFunction("cos", new StandardSQLFunction("cos", Hibernate.DOUBLE) );
registerFunction("cosh", new StandardSQLFunction("cosh", Hibernate.DOUBLE) );
registerFunction("cot", new StandardSQLFunction("cot", Hibernate.DOUBLE) );
registerFunction("exp", new StandardSQLFunction("exp", Hibernate.DOUBLE) );
registerFunction("ln", new StandardSQLFunction("ln", Hibernate.DOUBLE) );
registerFunction("log", new StandardSQLFunction("log", Hibernate.DOUBLE) );
registerFunction("log10", new StandardSQLFunction("log10", Hibernate.DOUBLE) );
registerFunction("pi", new NoArgSQLFunction("pi", Hibernate.DOUBLE) );
registerFunction("rand", new NoArgSQLFunction("rand", Hibernate.DOUBLE) );
registerFunction("sin", new StandardSQLFunction("sin", Hibernate.DOUBLE) );
registerFunction("sinh", new StandardSQLFunction("sinh", Hibernate.DOUBLE) );
registerFunction("sqrt", new StandardSQLFunction("sqrt", Hibernate.DOUBLE) );
registerFunction("tan", new StandardSQLFunction("tan", Hibernate.DOUBLE) );
registerFunction("tanh", new StandardSQLFunction("tanh", Hibernate.DOUBLE) );
registerFunction( "round", new StandardSQLFunction("round") );
registerFunction( "trunc", new StandardSQLFunction("trunc") );
registerFunction( "ceil", new StandardSQLFunction("ceil") );
registerFunction( "floor", new StandardSQLFunction("floor") );
registerFunction( "chr", new StandardSQLFunction("chr", Hibernate.CHARACTER) );
registerFunction( "initcap", new StandardSQLFunction("initcap") );
registerFunction( "user", new NoArgSQLFunction("user", Hibernate.STRING, false) );
registerFunction( "current_date", new NoArgSQLFunction("current_date", Hibernate.DATE, false) );
registerFunction( "current_time", new NoArgSQLFunction("current_timestamp", Hibernate.TIME, false) );
registerFunction( "current_timestamp", new NoArgSQLFunction("current_timestamp", Hibernate.TIMESTAMP, false) );
registerFunction("curdate", new NoArgSQLFunction("curdate",Hibernate.DATE) );
registerFunction("curtime", new NoArgSQLFunction("curtime",Hibernate.TIME) );
registerFunction("days", new StandardSQLFunction("days",Hibernate.INTEGER) );
registerFunction("dayofmonth", new StandardSQLFunction("dayofmonth",Hibernate.INTEGER) );
registerFunction("dayname", new StandardSQLFunction("dayname",Hibernate.STRING) );
registerFunction("dayofweek", new StandardSQLFunction("dayofweek",Hibernate.INTEGER) );
registerFunction("dayofyear", new StandardSQLFunction("dayofyear",Hibernate.INTEGER) );
registerFunction("hour", new StandardSQLFunction("hour",Hibernate.INTEGER) );
registerFunction("last_day", new StandardSQLFunction("last_day",Hibernate.DATE) );
registerFunction("microsecond", new StandardSQLFunction("microsecond",Hibernate.INTEGER) );
registerFunction("minute", new StandardSQLFunction("minute",Hibernate.INTEGER) );
registerFunction("month", new StandardSQLFunction("month",Hibernate.INTEGER) );
registerFunction("monthname", new StandardSQLFunction("monthname",Hibernate.STRING) );
registerFunction("now", new NoArgSQLFunction("now",Hibernate.TIMESTAMP) );
registerFunction("quarter", new StandardSQLFunction("quarter",Hibernate.INTEGER) );
registerFunction("second", new StandardSQLFunction("second",Hibernate.INTEGER) );
registerFunction("time", new StandardSQLFunction("time",Hibernate.TIME) );
registerFunction("timestamp", new StandardSQLFunction("timestamp",Hibernate.TIMESTAMP) );
registerFunction("week", new StandardSQLFunction("week",Hibernate.INTEGER) );
registerFunction("year", new StandardSQLFunction("year",Hibernate.INTEGER) );
registerFunction("atan2", new StandardSQLFunction("atan2",Hibernate.DOUBLE) );
registerFunction( "mod", new StandardSQLFunction("mod",Hibernate.INTEGER) );
registerFunction( "nvl", new StandardSQLFunction("nvl") );
registerFunction( "power", new StandardSQLFunction("power", Hibernate.DOUBLE) );
/**
* For a list of column types to register, see section A-1
* in 7862 7395, the Unisys JDBC manual.
*
* Here are column sizes as documented in Table A-1 of
* 7831 0760, "Enterprise Relational Database Server
* for ClearPath OS2200 Administration Guide"
* Numeric - 21
* Decimal - 22 (21 digits plus one for sign)
* Float - 60 bits
* Char - 28000
* NChar - 14000
* BLOB+ - 4294967296 (4 Gb)
* + RDMS JDBC driver does not support BLOBs
*
* DATE, TIME and TIMESTAMP literal formats are
* are all described in section 2.3.4 DATE Literal Format
* in 7830 8160.
* The DATE literal format is: YYYY-MM-DD
* The TIME literal format is: HH:MM:SS[.[FFFFFF]]
* The TIMESTAMP literal format is: YYYY-MM-DD HH:MM:SS[.[FFFFFF]]
*
* Note that $l (dollar-L) will use the length value if provided.
* Also new for Hibernate3 is the $p percision and $s (scale) parameters
*/
registerColumnType(Types.BIT, "SMALLINT");
registerColumnType(Types.TINYINT, "SMALLINT");
registerColumnType(Types.BIGINT, "NUMERIC(21,0)");
registerColumnType(Types.SMALLINT, "SMALLINT");
registerColumnType(Types.CHAR, "CHARACTER(1)");
registerColumnType(Types.DOUBLE, "DOUBLE PRECISION");
registerColumnType(Types.FLOAT, "FLOAT");
registerColumnType(Types.REAL, "REAL");
registerColumnType(Types.INTEGER, "INTEGER");
registerColumnType(Types.NUMERIC, "NUMERIC(21,$l)");
registerColumnType(Types.DECIMAL, "NUMERIC(21,$l)");
registerColumnType(Types.DATE, "DATE");
registerColumnType(Types.TIME, "TIME");
registerColumnType(Types.TIMESTAMP, "TIMESTAMP");
registerColumnType(Types.VARCHAR, "CHARACTER($l)");
registerColumnType(Types.BLOB, "BLOB($l)" );
/*
* The following types are not supported in RDMS/JDBC and therefore commented out.
* However, in some cases, mapping them to CHARACTER columns works
* for many applications, but does not work for all cases.
*/
// registerColumnType(Types.VARBINARY, "CHARACTER($l)");
// registerColumnType(Types.BLOB, "CHARACTER($l)" ); // For use prior to CP 11.0
// registerColumnType(Types.CLOB, "CHARACTER($l)" );
}
// Dialect method overrides ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* RDMS does not support qualifing index names with the schema name.
*/
public boolean qualifyIndexName() {
return false;
}
/**
* The RDMS DB supports the 'FOR UPDATE OF' clause. However, the RDMS-JDBC
* driver does not support this feature, so a false is return.
* The base dialect also returns a false, but we will leave this over-ride
* in to make sure it stays false.
*/
public boolean forUpdateOfColumns() {
return false;
}
/**
* Since the RDMS-JDBC driver does not support for updates, this string is
* set to an empty string. Whenever, the driver does support this feature,
* the returned string should be " FOR UPDATE OF". Note that RDMS does not
* support the string 'FOR UPDATE' string.
*/
public String getForUpdateString() {
return ""; // Original Dialect.java returns " for update";
}
/**
* RDMS does not support adding Unique constraints via create and alter table.
*/
public boolean supportsUniqueConstraintInCreateAlterTable() {
return true;
}
// Verify the state of this new method in Hibernate 3.0 Dialect.java
/**
* RDMS does not support Cascade Deletes.
* Need to review this in the future when support is provided.
*/
public boolean supportsCascadeDelete() {
return false; // Origial Dialect.java returns true;
}
/**
* Currently, RDMS-JDBC does not support ForUpdate.
* Need to review this in the future when support is provided.
*/
public boolean supportsOuterJoinForUpdate() {
return false;
}
public String getAddColumnString() {
return "add";
}
public String getNullColumnString() {
// The keyword used to specify a nullable column.
return " null";
}
// *** Sequence methods - start. The RDMS dialect needs these
// methods to make it possible to use the Native Id generator
public boolean supportsSequences() {
return true;
}
public String getSequenceNextValString(String sequenceName) {
// The where clause was added to eliminate this statement from Brute Force Searches.
return "select permuted_id('NEXT',31) from rdms.rdms_dummy where key_col = 1 ";
}
public String getCreateSequenceString(String sequenceName) {
// We must return a valid RDMS/RSA command from this method to
// prevent RDMS/RSA from issuing *ERROR 400
return "";
}
public String getDropSequenceString(String sequenceName) {
// We must return a valid RDMS/RSA command from this method to
// prevent RDMS/RSA from issuing *ERROR 400
return "";
}
// *** Sequence methods - end
public String getCascadeConstraintsString() {
// Used with DROP TABLE to delete all records in the table.
return " including contents";
}
public CaseFragment createCaseFragment() {
return new DecodeCaseFragment();
}
public boolean supportsLimit() {
return true;
}
public boolean supportsLimitOffset() {
return false;
}
public String getLimitString(String sql, int offset, int limit) {
if (offset>0) throw new UnsupportedOperationException("RDMS does not support paged queries");
return new StringBuffer(sql.length() + 40)
.append(sql)
.append(" fetch first ")
.append(limit)
.append(" rows only ")
.toString();
}
public boolean supportsVariableLimit() {
return false;
}
public boolean supportsUnionAll() {
// RDMS supports the UNION ALL clause.
return true;
}
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
// RDMS has no known variation of a "SELECT ... FOR UPDATE" syntax...
if ( lockMode.greaterThan( LockMode.READ ) ) {
return new UpdateLockingStrategy( lockable, lockMode );
}
else {
return new SelectLockingStrategy( lockable, lockMode );
}
}
}
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