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PostgreSQLDialect.javaAPI DocHibernate 3.2.511452Thu Mar 29 08:26:26 BST 2007org.hibernate.dialect

PostgreSQLDialect

public class PostgreSQLDialect extends Dialect
An SQL dialect for Postgres
author
Gavin King

Fields Summary
private static org.hibernate.exception.ViolatedConstraintNameExtracter
EXTRACTER
Constraint-name extractor for Postgres contraint violation exceptions. Orginally contributed by Denny Bartelt.
Constructors Summary
public PostgreSQLDialect()

		super();
		registerColumnType( Types.BIT, "bool" );
		registerColumnType( Types.BIGINT, "int8" );
		registerColumnType( Types.SMALLINT, "int2" );
		registerColumnType( Types.TINYINT, "int2" );
		registerColumnType( Types.INTEGER, "int4" );
		registerColumnType( Types.CHAR, "char(1)" );
		registerColumnType( Types.VARCHAR, "varchar($l)" );
		registerColumnType( Types.FLOAT, "float4" );
		registerColumnType( Types.DOUBLE, "float8" );
		registerColumnType( Types.DATE, "date" );
		registerColumnType( Types.TIME, "time" );
		registerColumnType( Types.TIMESTAMP, "timestamp" );
		registerColumnType( Types.VARBINARY, "bytea" );
		registerColumnType( Types.CLOB, "text" );
		registerColumnType( Types.BLOB, "oid" );
		registerColumnType( Types.NUMERIC, "numeric($p, $s)" );

		registerFunction( "abs", new StandardSQLFunction("abs") );
		registerFunction( "sign", new StandardSQLFunction("sign", Hibernate.INTEGER) );

		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( "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( "sin", new StandardSQLFunction("sin", Hibernate.DOUBLE) );
		registerFunction( "sqrt", new StandardSQLFunction("sqrt", Hibernate.DOUBLE) );
		registerFunction( "cbrt", new StandardSQLFunction("cbrt", Hibernate.DOUBLE) );
		registerFunction( "tan", new StandardSQLFunction("tan", Hibernate.DOUBLE) );
		registerFunction( "radians", new StandardSQLFunction("radians", Hibernate.DOUBLE) );
		registerFunction( "degrees", new StandardSQLFunction("degrees", Hibernate.DOUBLE) );

		registerFunction( "stddev", new StandardSQLFunction("stddev", Hibernate.DOUBLE) );
		registerFunction( "variance", new StandardSQLFunction("variance", Hibernate.DOUBLE) );

		registerFunction( "random", new NoArgSQLFunction("random", 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( "lower", new StandardSQLFunction("lower") );
		registerFunction( "upper", new StandardSQLFunction("upper") );
		registerFunction( "substr", new StandardSQLFunction("substr", Hibernate.STRING) );
		registerFunction( "initcap", new StandardSQLFunction("initcap") );
		registerFunction( "to_ascii", new StandardSQLFunction("to_ascii") );
		registerFunction( "quote_ident", new StandardSQLFunction("quote_ident", Hibernate.STRING) );
		registerFunction( "quote_literal", new StandardSQLFunction("quote_literal", Hibernate.STRING) );
		registerFunction( "md5", new StandardSQLFunction("md5") );
		registerFunction( "ascii", new StandardSQLFunction("ascii", Hibernate.INTEGER) );
		registerFunction( "length", new StandardSQLFunction("length", Hibernate.LONG) );
		registerFunction( "char_length", new StandardSQLFunction("char_length", Hibernate.LONG) );
		registerFunction( "bit_length", new StandardSQLFunction("bit_length", Hibernate.LONG) );
		registerFunction( "octet_length", new StandardSQLFunction("octet_length", Hibernate.LONG) );

		registerFunction( "current_date", new NoArgSQLFunction("current_date", Hibernate.DATE, false) );
		registerFunction( "current_time", new NoArgSQLFunction("current_time", Hibernate.TIME, false) );
		registerFunction( "current_timestamp", new NoArgSQLFunction("current_timestamp", Hibernate.TIMESTAMP, false) );
		registerFunction( "localtime", new NoArgSQLFunction("localtime", Hibernate.TIME, false) );
		registerFunction( "localtimestamp", new NoArgSQLFunction("localtimestamp", Hibernate.TIMESTAMP, false) );
		registerFunction( "now", new NoArgSQLFunction("now", Hibernate.TIMESTAMP) );
		registerFunction( "timeofday", new NoArgSQLFunction("timeofday", Hibernate.STRING) );
		registerFunction( "age", new StandardSQLFunction("age") );

		registerFunction( "current_user", new NoArgSQLFunction("current_user", Hibernate.STRING, false) );
		registerFunction( "session_user", new NoArgSQLFunction("session_user", Hibernate.STRING, false) );
		registerFunction( "user", new NoArgSQLFunction("user", Hibernate.STRING, false) );
		registerFunction( "current_database", new NoArgSQLFunction("current_database", Hibernate.STRING, true) );
		registerFunction( "current_schema", new NoArgSQLFunction("current_schema", Hibernate.STRING, true) );
		
		registerFunction( "to_char", new StandardSQLFunction("to_char", Hibernate.STRING) );
		registerFunction( "to_date", new StandardSQLFunction("to_date", Hibernate.DATE) );
		registerFunction( "to_timestamp", new StandardSQLFunction("to_timestamp", Hibernate.TIMESTAMP) );
		registerFunction( "to_number", new StandardSQLFunction("to_number", Hibernate.BIG_DECIMAL) );

		registerFunction( "concat", new VarArgsSQLFunction( Hibernate.STRING, "(","||",")" ) );

		registerFunction( "locate", new PositionSubstringFunction() );

		registerFunction( "str", new SQLFunctionTemplate(Hibernate.STRING, "cast(?1 as varchar)") );

		getDefaultProperties().setProperty(Environment.STATEMENT_BATCH_SIZE, DEFAULT_BATCH_SIZE);
Methods Summary
public booleanbindLimitParametersInReverseOrder()

		return true;
public booleandropConstraints()

		return true;
public java.lang.StringgetAddColumnString()

		return "add column";
public java.lang.StringgetCascadeConstraintsString()

		return "";//" cascade";
public java.lang.StringgetCreateSequenceString(java.lang.String sequenceName)

		return "create sequence " + sequenceName; //starts with 1, implicitly
public java.lang.StringgetCreateTemporaryTablePostfix()

		return "on commit drop";
public java.lang.StringgetCreateTemporaryTableString()

		return "create local temporary table";
public java.lang.StringgetCurrentTimestampSelectString()

		return "select now()";
public java.lang.StringgetDropSequenceString(java.lang.String sequenceName)

		return "drop sequence " + sequenceName;
public java.lang.StringgetForUpdateString(java.lang.String aliases)

		return getForUpdateString() + " of " + aliases;
public java.lang.StringgetIdentityColumnString(int type)

		return type==Types.BIGINT ?
			"bigserial not null" :
			"serial not null";
public java.lang.StringgetIdentitySelectString(java.lang.String table, java.lang.String column, int type)

		return new StringBuffer().append("select currval('")
			.append(table)
			.append('_")
			.append(column)
			.append("_seq')")
			.toString();
public java.lang.StringgetLimitString(java.lang.String sql, boolean hasOffset)

		return new StringBuffer( sql.length()+20 )
			.append(sql)
			.append(hasOffset ? " limit ? offset ?" : " limit ?")
			.toString();
public java.lang.ClassgetNativeIdentifierGeneratorClass()

		return SequenceGenerator.class;
public java.lang.StringgetNoColumnsInsertString()

		return "default values";
public java.lang.StringgetQuerySequencesString()

		return "select relname from pg_class where relkind='S'";
public java.lang.StringgetSelectClauseNullString(int sqlType)
Workaround for postgres bug #1453

		String typeName = getTypeName(sqlType, 1, 1, 0);
		//trim off the length/precision/scale
		int loc = typeName.indexOf('(");
		if (loc>-1) {
			typeName = typeName.substring(0, loc);
		}
		return "null::" + typeName;
public java.lang.StringgetSelectSequenceNextValString(java.lang.String sequenceName)

		return "nextval ('" + sequenceName + "')";
public java.lang.StringgetSequenceNextValString(java.lang.String sequenceName)

		return "select " + getSelectSequenceNextValString( sequenceName );
public org.hibernate.exception.ViolatedConstraintNameExtractergetViolatedConstraintNameExtracter()

		return EXTRACTER;
public booleanhasDataTypeInIdentityColumn()

		return false;
public booleanisCurrentTimestampSelectStringCallable()

		return false;
public booleansupportsCommentOn()

		return true;
public booleansupportsCurrentTimestampSelection()

		return true;
public booleansupportsEmptyInList()



	// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

// seems to not really...
//	public boolean supportsRowValueConstructorSyntax() {
//		return true;
//	}

	   
		return false;
public booleansupportsExpectedLobUsagePattern()

		// PostgreSQL seems to have spotty LOB suppport
		return false;
public booleansupportsIdentityColumns()

		return true;
public booleansupportsLimit()

		return true;
public booleansupportsOuterJoinForUpdate()

		return false;
public booleansupportsSequences()

		return true;
public booleansupportsTemporaryTables()

		return true;
public booleansupportsUnionAll()

		return true;
public java.lang.StringtoBooleanValueString(boolean bool)

		return bool ? "true" : "false";
public booleanuseInputStreamToInsertBlob()

		return false;