| /* |
| * Copyright (c) 1998, 2021 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 v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // 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 {@literal <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<Class<?>, FieldTypeDefinition> buildFieldTypes() { |
| Hashtable<Class<?>, FieldTypeDefinition> 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<DatabaseField> pkFields, |
| Collection<DatabaseField> 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(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); |
| List<String> v = new ArrayList<>(2); |
| v.add("CONVERT("); |
| v.add(",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); |
| List<String> v = new ArrayList<>(2); |
| v.add("(MONTH("); |
| v.add(") - MONTH("); |
| v.add("))"); |
| exOperator.printsAs(v); |
| exOperator.bePrefix(); |
| exOperator.setNodeClass(ClassConstants.FunctionExpression_Class); |
| return exOperator; |
| } |
| |
| @Override |
| public boolean isH2() { |
| return true; |
| } |
| |
| /** |
| * INTERNAL: |
| * Used for stored procedure calls. |
| */ |
| @Override |
| public String getProcedureCallHeader() { |
| return "CALL "; |
| } |
| } |