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/*
* Copyright 2004-2019 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.engine;
import java.sql.Types;
import java.util.Collections;
import java.util.HashMap;
import java.util.Set;
import java.util.regex.Pattern;
import org.h2.util.StringUtils;
import org.h2.value.DataType;
import org.h2.value.Value;
/**
* The compatibility modes. There is a fixed set of modes (for example
* PostgreSQL, MySQL). Each mode has different settings.
*/
public class Mode {
public enum ModeEnum {
REGULAR, DB2, Derby, MSSQLServer, HSQLDB, MySQL, Oracle, PostgreSQL, Ignite,
}
/**
* Determines how rows with {@code NULL} values in indexed columns are handled
* in unique indexes.
*/
public enum UniqueIndexNullsHandling {
/**
* Multiple rows with identical values in indexed columns with at least one
* indexed {@code NULL} value are allowed in unique index.
*/
ALLOW_DUPLICATES_WITH_ANY_NULL,
/**
* Multiple rows with identical values in indexed columns with all indexed
* {@code NULL} values are allowed in unique index.
*/
ALLOW_DUPLICATES_WITH_ALL_NULLS,
/**
* Multiple rows with identical values in indexed columns are not allowed in
* unique index.
*/
FORBID_ANY_DUPLICATES
}
private static final HashMap MODES = new HashMap<>();
// Modes are also documented in the features section
/**
* When enabled, aliased columns (as in SELECT ID AS I FROM TEST) return the
* alias (I in this case) in ResultSetMetaData.getColumnName() and 'null' in
* getTableName(). If disabled, the real column name (ID in this case) and
* table name is returned.
*/
public boolean aliasColumnName;
/**
* When converting the scale of decimal data, the number is only converted
* if the new scale is smaller than the current scale. Usually, the scale is
* converted and 0s are added if required.
*/
public boolean convertOnlyToSmallerScale;
/**
* Creating indexes in the CREATE TABLE statement is allowed using
* INDEX(..) or KEY(..).
* Example: create table test(id int primary key, name varchar(255),
* key idx_name(name));
*/
public boolean indexDefinitionInCreateTable;
/**
* Concatenation with NULL results in NULL. Usually, NULL is treated as an
* empty string if only one of the operands is NULL, and NULL is only
* returned if both operands are NULL.
*/
public boolean nullConcatIsNull;
/**
* Identifiers may be quoted using square brackets as in [Test].
*/
public boolean squareBracketQuotedNames;
/**
* The system columns 'CTID' and 'OID' are supported.
*/
public boolean systemColumns;
/**
* Determines how rows with {@code NULL} values in indexed columns are handled
* in unique indexes.
*/
public UniqueIndexNullsHandling uniqueIndexNullsHandling = UniqueIndexNullsHandling.ALLOW_DUPLICATES_WITH_ANY_NULL;
/**
* Empty strings are treated like NULL values. Useful for Oracle emulation.
*/
public boolean treatEmptyStringsAsNull;
/**
* Support the pseudo-table SYSIBM.SYSDUMMY1.
*/
public boolean sysDummy1;
/**
* Text can be concatenated using '+'.
*/
public boolean allowPlusForStringConcat;
/**
* The single-argument function LOG() uses base 10 instead of E.
*/
public boolean logIsLogBase10;
/**
* Swap the parameters of LOG() function.
*/
public boolean swapLogFunctionParameters;
/**
* The function REGEXP_REPLACE() uses \ for back-references.
*/
public boolean regexpReplaceBackslashReferences;
/**
* SERIAL and BIGSERIAL columns are not automatically primary keys.
*/
public boolean serialColumnIsNotPK;
/**
* Swap the parameters of the CONVERT function.
*/
public boolean swapConvertFunctionParameters;
/**
* can set the isolation level using WITH {RR|RS|CS|UR}
*/
public boolean isolationLevelInSelectOrInsertStatement;
/**
* MySQL style INSERT ... ON DUPLICATE KEY UPDATE ... and INSERT IGNORE.
*/
public boolean onDuplicateKeyUpdate;
/**
* MySQL style REPLACE INTO.
*/
public boolean replaceInto;
/**
* PostgreSQL style INSERT ... ON CONFLICT DO NOTHING.
*/
public boolean insertOnConflict;
/**
* Pattern describing the keys the java.sql.Connection.setClientInfo()
* method accepts.
*/
public Pattern supportedClientInfoPropertiesRegEx;
/**
* Support the # for column names
*/
public boolean supportPoundSymbolForColumnNames;
/**
* Whether IN predicate may have an empty value list.
*/
public boolean allowEmptyInPredicate;
/**
* Whether AFFINITY KEY keywords are supported.
*/
public boolean allowAffinityKey;
/**
* Whether to right-pad fixed strings with spaces.
*/
public boolean padFixedLengthStrings;
/**
* Whether DB2 TIMESTAMP formats are allowed.
*/
public boolean allowDB2TimestampFormat;
/**
* Discard SQLServer table hints (e.g. "SELECT * FROM table WITH (NOLOCK)")
*/
public boolean discardWithTableHints;
/**
* Use "IDENTITY" as an alias for "auto_increment" (SQLServer style)
*/
public boolean useIdentityAsAutoIncrement;
/**
* Convert (VAR)CHAR to VAR(BINARY) and vice versa with UTF-8 encoding instead of HEX.
*/
public boolean charToBinaryInUtf8;
/**
* If {@code true}, datetime value function return the same value within a
* transaction, if {@code false} datetime value functions return the same
* value within a command.
*/
public boolean dateTimeValueWithinTransaction;
/**
* If {@code true} {@code 0x}-prefixed numbers are parsed as binary string
* literals, if {@code false} they are parsed as hexadecimal numeric values.
*/
public boolean zeroExLiteralsAreBinaryStrings;
/**
* If {@code true} unrelated ORDER BY expression are allowed in DISTINCT
* queries, if {@code false} they are disallowed.
*/
public boolean allowUnrelatedOrderByExpressionsInDistinctQueries;
/**
* If {@code true} some additional non-standard ALTER TABLE commands are allowed.
*/
public boolean alterTableExtensionsMySQL;
/**
* If {@code true} non-standard ALTER TABLE MODIFY COLUMN is allowed.
*/
public boolean alterTableModifyColumn;
/**
* If {@code true} TRUNCATE TABLE uses RESTART IDENTITY by default.
*/
public boolean truncateTableRestartIdentity;
/**
* If {@code true} NEXT VALUE FOR SEQUENCE, CURRENT VALUE FOR SEQUENCE,
* SEQUENCE.NEXTVAL, and SEQUENCE.CURRVAL return values with DECIMAL/NUMERIC
* data type instead of BIGINT.
*/
public boolean decimalSequences;
/**
* If {@code true} constructs like 'CREATE TABLE CATALOG..TABLE_NAME' are allowed,
* the default schema is used.
*/
public boolean allowEmptySchemaValuesAsDefaultSchema;
/**
* An optional Set of hidden/disallowed column types.
* Certain DBMSs don't support all column types provided by H2, such as
* "NUMBER" when using PostgreSQL mode.
*/
public Set disallowedTypes = Collections.emptySet();
/**
* Custom mappings from type names to data types.
*/
public HashMap typeByNameMap = new HashMap<>();
private final String name;
private final ModeEnum modeEnum;
static {
Mode mode = new Mode(ModeEnum.REGULAR);
mode.nullConcatIsNull = true;
mode.allowEmptyInPredicate = true;
mode.dateTimeValueWithinTransaction = true;
add(mode);
mode = new Mode(ModeEnum.DB2);
mode.aliasColumnName = true;
mode.sysDummy1 = true;
mode.isolationLevelInSelectOrInsertStatement = true;
// See
// https://www.ibm.com/support/knowledgecenter/SSEPEK_11.0.0/
// com.ibm.db2z11.doc.java/src/tpc/imjcc_r0052001.dita
mode.supportedClientInfoPropertiesRegEx =
Pattern.compile("ApplicationName|ClientAccountingInformation|" +
"ClientUser|ClientCorrelationToken");
mode.allowDB2TimestampFormat = true;
add(mode);
mode = new Mode(ModeEnum.Derby);
mode.aliasColumnName = true;
mode.uniqueIndexNullsHandling = UniqueIndexNullsHandling.FORBID_ANY_DUPLICATES;
mode.sysDummy1 = true;
mode.isolationLevelInSelectOrInsertStatement = true;
// Derby does not support client info properties as of version 10.12.1.1
mode.supportedClientInfoPropertiesRegEx = null;
add(mode);
mode = new Mode(ModeEnum.HSQLDB);
mode.nullConcatIsNull = true;
mode.allowPlusForStringConcat = true;
// HSQLDB does not support client info properties. See
// http://hsqldb.org/doc/apidocs/
// org/hsqldb/jdbc/JDBCConnection.html#
// setClientInfo%28java.lang.String,%20java.lang.String%29
mode.supportedClientInfoPropertiesRegEx = null;
add(mode);
mode = new Mode(ModeEnum.MSSQLServer);
mode.aliasColumnName = true;
mode.squareBracketQuotedNames = true;
mode.uniqueIndexNullsHandling = UniqueIndexNullsHandling.FORBID_ANY_DUPLICATES;
mode.allowPlusForStringConcat = true;
mode.swapLogFunctionParameters = true;
mode.swapConvertFunctionParameters = true;
mode.supportPoundSymbolForColumnNames = true;
mode.discardWithTableHints = true;
mode.useIdentityAsAutoIncrement = true;
// MS SQL Server does not support client info properties. See
// https://msdn.microsoft.com/en-Us/library/dd571296%28v=sql.110%29.aspx
mode.supportedClientInfoPropertiesRegEx = null;
mode.zeroExLiteralsAreBinaryStrings = true;
mode.truncateTableRestartIdentity = true;
DataType dt = DataType.createNumeric(19, 4, false);
dt.type = Value.DECIMAL;
dt.sqlType = Types.NUMERIC;
dt.name = "MONEY";
mode.typeByNameMap.put("MONEY", dt);
dt = DataType.createNumeric(10, 4, false);
dt.type = Value.DECIMAL;
dt.sqlType = Types.NUMERIC;
dt.name = "SMALLMONEY";
mode.typeByNameMap.put("SMALLMONEY", dt);
mode.allowEmptySchemaValuesAsDefaultSchema = true;
add(mode);
mode = new Mode(ModeEnum.MySQL);
mode.indexDefinitionInCreateTable = true;
// Next one is for MariaDB
mode.regexpReplaceBackslashReferences = true;
mode.onDuplicateKeyUpdate = true;
mode.replaceInto = true;
// MySQL allows to use any key for client info entries. See
// http://grepcode.com/file/repo1.maven.org/maven2/mysql/
// mysql-connector-java/5.1.24/com/mysql/jdbc/
// JDBC4CommentClientInfoProvider.java
mode.supportedClientInfoPropertiesRegEx =
Pattern.compile(".*");
mode.charToBinaryInUtf8 = true;
mode.zeroExLiteralsAreBinaryStrings = true;
mode.allowUnrelatedOrderByExpressionsInDistinctQueries = true;
mode.alterTableExtensionsMySQL = true;
mode.alterTableModifyColumn = true;
mode.truncateTableRestartIdentity = true;
add(mode);
mode = new Mode(ModeEnum.Oracle);
mode.aliasColumnName = true;
mode.convertOnlyToSmallerScale = true;
mode.uniqueIndexNullsHandling = UniqueIndexNullsHandling.ALLOW_DUPLICATES_WITH_ALL_NULLS;
mode.treatEmptyStringsAsNull = true;
mode.regexpReplaceBackslashReferences = true;
mode.supportPoundSymbolForColumnNames = true;
// Oracle accepts keys of the form .*. See
// https://docs.oracle.com/database/121/JJDBC/jdbcvers.htm#JJDBC29006
mode.supportedClientInfoPropertiesRegEx =
Pattern.compile(".*\\..*");
mode.alterTableModifyColumn = true;
mode.decimalSequences = true;
dt = DataType.createDate(/* 2001-01-01 23:59:59 */ 19, 19, "DATE", false, 0, 0);
dt.type = Value.TIMESTAMP;
dt.sqlType = Types.TIMESTAMP;
dt.name = "DATE";
mode.typeByNameMap.put("DATE", dt);
add(mode);
mode = new Mode(ModeEnum.PostgreSQL);
mode.aliasColumnName = true;
mode.nullConcatIsNull = true;
mode.systemColumns = true;
mode.logIsLogBase10 = true;
mode.regexpReplaceBackslashReferences = true;
mode.serialColumnIsNotPK = true;
mode.insertOnConflict = true;
// PostgreSQL only supports the ApplicationName property. See
// https://github.com/hhru/postgres-jdbc/blob/master/postgresql-jdbc-9.2-1002.src/
// org/postgresql/jdbc4/AbstractJdbc4Connection.java
mode.supportedClientInfoPropertiesRegEx =
Pattern.compile("ApplicationName");
mode.padFixedLengthStrings = true;
// Enumerate all H2 types NOT supported by PostgreSQL:
Set disallowedTypes = new java.util.HashSet<>();
disallowedTypes.add("NUMBER");
disallowedTypes.add("IDENTITY");
disallowedTypes.add("TINYINT");
disallowedTypes.add("BLOB");
mode.disallowedTypes = disallowedTypes;
dt = DataType.createNumeric(19, 2, false);
dt.type = Value.DECIMAL;
dt.sqlType = Types.NUMERIC;
dt.name = "MONEY";
mode.typeByNameMap.put("MONEY", dt);
mode.dateTimeValueWithinTransaction = true;
add(mode);
mode = new Mode(ModeEnum.Ignite);
mode.nullConcatIsNull = true;
mode.allowAffinityKey = true;
mode.indexDefinitionInCreateTable = true;
mode.allowEmptyInPredicate = true;
mode.dateTimeValueWithinTransaction = true;
add(mode);
}
private Mode(ModeEnum modeEnum) {
this.name = modeEnum.name();
this.modeEnum = modeEnum;
}
private static void add(Mode mode) {
MODES.put(StringUtils.toUpperEnglish(mode.name), mode);
}
/**
* Get the mode with the given name.
*
* @param name the name of the mode
* @return the mode object
*/
public static Mode getInstance(String name) {
return MODES.get(StringUtils.toUpperEnglish(name));
}
public static Mode getRegular() {
return getInstance(ModeEnum.REGULAR.name());
}
public String getName() {
return name;
}
public ModeEnum getEnum() {
return this.modeEnum;
}
@Override
public String toString() {
return name;
}
}
