/******************************************************************************* | |
* Copyright (c) 1998, 2013 Oracle and/or its affiliates. All rights reserved. | |
* This program and the accompanying materials are made available under the | |
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 | |
* which accompanies this distribution. | |
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html | |
* and the Eclipse Distribution License is available at | |
* http://www.eclipse.org/org/documents/edl-v10.php. | |
* | |
* Contributors: | |
* Mike Keith | |
* | |
* Patterned after: | |
* org.eclipse.persistence.platform.database.DB2MainframePlatform | |
* | |
* 09/14/2011-2.3.1 Guy Pelletier | |
* - 357533: Allow DDL queries to execute even when Multitenant entities are part of the PU | |
******************************************************************************/ | |
package org.eclipse.persistence.platform.database; | |
import java.io.*; | |
import java.util.*; | |
import org.eclipse.persistence.internal.databaseaccess.DatabaseCall; | |
import org.eclipse.persistence.internal.databaseaccess.FieldTypeDefinition; | |
import org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter; | |
import org.eclipse.persistence.internal.expressions.SQLSelectStatement; | |
import org.eclipse.persistence.internal.helper.ClassConstants; | |
import org.eclipse.persistence.internal.helper.DatabaseField; | |
import org.eclipse.persistence.internal.helper.DatabaseTable; | |
import org.eclipse.persistence.queries.ValueReadQuery; | |
import org.eclipse.persistence.exceptions.ValidationException; | |
import org.eclipse.persistence.expressions.ExpressionOperator; | |
public class H2Platform extends DatabasePlatform { | |
private static final long serialVersionUID = -2935483687958482934L; | |
public H2Platform() { | |
super(); | |
setPingSQL("SELECT 1"); | |
} | |
/** | |
* Print the pagination SQL using H2 syntax " LIMIT <max> OFFSET <first>". | |
*/ | |
@Override | |
public void printSQLSelectStatement(DatabaseCall call, ExpressionSQLPrinter printer, SQLSelectStatement statement) { | |
int max = 0; | |
if (statement.getQuery() != null) { | |
max = statement.getQuery().getMaxRows(); | |
} | |
if (max <= 0 || !(this.shouldUseRownumFiltering())) { | |
super.printSQLSelectStatement(call, printer, statement); | |
return; | |
} | |
statement.setUseUniqueFieldAliases(true); | |
call.setFields(statement.printSQL(printer)); | |
printer.printString(" LIMIT "); | |
printer.printParameter(DatabaseCall.MAXROW_FIELD); | |
printer.printString(" OFFSET "); | |
printer.printParameter(DatabaseCall.FIRSTRESULT_FIELD); | |
call.setIgnoreFirstRowSetting(true); | |
call.setIgnoreMaxResultsSetting(true); | |
} | |
/** | |
* INTERNAL: | |
* Use the JDBC maxResults and firstResultIndex setting to compute a value to use when | |
* limiting the results of a query in SQL. These limits tend to be used in two ways. | |
* | |
* 1. MaxRows is the index of the last row to be returned (like JDBC maxResults) | |
* 2. MaxRows is the number of rows to be returned | |
* | |
* H2 uses case #2 and therefore the maxResults has to be altered based on the firstResultIndex. | |
*/ | |
@Override | |
public int computeMaxRowsForSQL(int firstResultIndex, int maxResults){ | |
return maxResults - ((firstResultIndex >= 0) ? firstResultIndex : 0); | |
} | |
@Override | |
protected Hashtable buildFieldTypes() { | |
Hashtable fieldTypeMapping = super.buildFieldTypes(); | |
fieldTypeMapping.put(Boolean.class, new FieldTypeDefinition("BOOLEAN", false)); | |
fieldTypeMapping.put(Integer.class, new FieldTypeDefinition("INTEGER", false)); | |
fieldTypeMapping.put(Long.class, new FieldTypeDefinition("BIGINT", false)); | |
fieldTypeMapping.put(Float.class, new FieldTypeDefinition("DOUBLE", false)); | |
fieldTypeMapping.put(Double.class, new FieldTypeDefinition("DOUBLE", 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("NUMERIC", 38)); | |
fieldTypeMapping.put(java.math.BigDecimal.class, new FieldTypeDefinition("NUMERIC", 38).setLimits(38, -19, 19)); | |
fieldTypeMapping.put(Number.class, new FieldTypeDefinition("NUMERIC", 38).setLimits(38, -19, 19)); | |
fieldTypeMapping.put(Byte[].class, new FieldTypeDefinition("LONGVARBINARY", false)); | |
fieldTypeMapping.put(Character[].class, new FieldTypeDefinition("LONGVARCHAR", false)); | |
fieldTypeMapping.put(byte[].class, new FieldTypeDefinition("LONGVARBINARY", false)); | |
fieldTypeMapping.put(char[].class, new FieldTypeDefinition("LONGVARCHAR", false)); | |
fieldTypeMapping.put(java.sql.Blob.class, new FieldTypeDefinition("BLOB", false)); | |
fieldTypeMapping.put(java.sql.Clob.class, new FieldTypeDefinition("CLOB", false)); | |
fieldTypeMapping.put(java.sql.Date.class, new FieldTypeDefinition("DATE", false)); | |
fieldTypeMapping.put(java.sql.Timestamp.class, new FieldTypeDefinition("TIMESTAMP", false)); | |
fieldTypeMapping.put(java.sql.Time.class, new FieldTypeDefinition("TIME", false)); | |
fieldTypeMapping.put(java.util.Calendar.class, new FieldTypeDefinition("TIMESTAMP", false)); | |
fieldTypeMapping.put(java.util.Date.class, new FieldTypeDefinition("TIMESTAMP", false)); | |
return fieldTypeMapping; | |
} | |
@Override | |
public boolean isAlterSequenceObjectSupported() { | |
return true; | |
} | |
/** | |
* INTERNAL | |
* H2 has some issues with using parameters on certain functions and relations. | |
* This allows statements to disable binding only in these cases. | |
*/ | |
@Override | |
public boolean isDynamicSQLRequiredForFunctions() { | |
return true; | |
} | |
@Override | |
public ValueReadQuery buildSelectQueryForSequenceObject(String seqName, Integer size) { | |
return new ValueReadQuery(new StringBuilder(20 + seqName.length()).append("CALL NEXT VALUE FOR ").append(seqName).toString()); | |
} | |
@Override | |
public boolean supportsIdentity() { | |
return true; | |
} | |
@Override | |
public boolean supportsSequenceObjects() { | |
return true; | |
} | |
@Override | |
public ValueReadQuery buildSelectQueryForIdentity() { | |
return new ValueReadQuery("CALL IDENTITY()"); | |
} | |
@Override | |
public void printFieldIdentityClause(Writer writer) throws ValidationException { | |
try { | |
writer.append(" IDENTITY"); | |
} catch (IOException e) { | |
throw ValidationException.logIOError(e); | |
} | |
} | |
@Override | |
public boolean supportsForeignKeyConstraints() { | |
return true; | |
} | |
@Override | |
public boolean supportsGlobalTempTables() { | |
return true; | |
} | |
@Override | |
protected String getCreateTempTableSqlPrefix() { | |
return "CREATE TEMPORARY TABLE IF NOT EXISTS "; | |
} | |
/** | |
* H2 does not allow using () in the update if only one field. | |
*/ | |
@Override | |
public void writeUpdateOriginalFromTempTableSql(Writer writer, DatabaseTable table, | |
Collection pkFields, | |
Collection assignedFields) throws IOException | |
{ | |
writer.write("UPDATE "); | |
String tableName = table.getQualifiedNameDelimited(this); | |
writer.write(tableName); | |
writer.write(" SET "); | |
if (assignedFields.size() > 1) { | |
writer.write("("); | |
} | |
writeFieldsList(writer, assignedFields, this); | |
if (assignedFields.size() > 1) { | |
writer.write(")"); | |
} | |
writer.write(" = (SELECT "); | |
writeFieldsList(writer, assignedFields, this); | |
writer.write(" FROM "); | |
String tempTableName = getTempTableForTable(table).getQualifiedNameDelimited(this); | |
writer.write(tempTableName); | |
writeAutoJoinWhereClause(writer, null, tableName, pkFields, this); | |
writer.write(") WHERE EXISTS(SELECT "); | |
writer.write(((DatabaseField)pkFields.iterator().next()).getNameDelimited(this)); | |
writer.write(" FROM "); | |
writer.write(tempTableName); | |
writeAutoJoinWhereClause(writer, null, tableName, pkFields, this); | |
writer.write(")"); | |
} | |
@Override | |
public boolean supportsStoredFunctions() { | |
return true; | |
} | |
@Override | |
public ValueReadQuery getTimestampQuery() { | |
if (timestampQuery == null) { | |
timestampQuery = new ValueReadQuery(); | |
timestampQuery.setSQLString("SELECT CURRENT_TIMESTAMP()"); | |
timestampQuery.setAllowNativeSQLQuery(true); | |
} | |
return timestampQuery; | |
} | |
@Override | |
protected void initializePlatformOperators() { | |
super.initializePlatformOperators(); | |
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Concat, "||")); | |
addOperator(ExpressionOperator.simpleFunction(ExpressionOperator.Ceil, "CEILING")); | |
addOperator(ExpressionOperator.simpleTwoArgumentFunction(ExpressionOperator.Nvl, "IFNULL")); | |
addOperator(toNumberOperator()); | |
addOperator(monthsBetweenOperator()); | |
} | |
/** | |
* INTERNAL: | |
* Use CONVERT function for toNumber. | |
*/ | |
public static ExpressionOperator toNumberOperator() { | |
ExpressionOperator exOperator = new ExpressionOperator(); | |
exOperator.setType(ExpressionOperator.FunctionOperator); | |
exOperator.setSelector(ExpressionOperator.ToNumber); | |
Vector v = org.eclipse.persistence.internal.helper.NonSynchronizedVector.newInstance(2); | |
v.addElement("CONVERT("); | |
v.addElement(",DECIMAL)"); | |
exOperator.printsAs(v); | |
exOperator.bePrefix(); | |
exOperator.setNodeClass(ClassConstants.FunctionExpression_Class); | |
return exOperator; | |
} | |
/** | |
* INTERNAL: | |
* Use MONTH function for MONTH_BETWEEN. | |
*/ | |
public static ExpressionOperator monthsBetweenOperator() { | |
ExpressionOperator exOperator = new ExpressionOperator(); | |
exOperator.setType(ExpressionOperator.FunctionOperator); | |
exOperator.setSelector(ExpressionOperator.MonthsBetween); | |
Vector v = org.eclipse.persistence.internal.helper.NonSynchronizedVector.newInstance(2); | |
v.addElement("(MONTH("); | |
v.addElement(") - MONTH("); | |
v.addElement("))"); | |
exOperator.printsAs(v); | |
exOperator.bePrefix(); | |
exOperator.setNodeClass(ClassConstants.FunctionExpression_Class); | |
return exOperator; | |
} | |
@Override | |
public boolean isH2() { | |
return true; | |
} | |
} |