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/*
* Copyright 2007 Daniel Spiewak
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.java.ao.db;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import net.java.ao.DatabaseProvider;
import net.java.ao.DisposableDataSource;
import net.java.ao.Query;
import net.java.ao.schema.IndexNameConverter;
import net.java.ao.schema.NameConverters;
import net.java.ao.schema.UniqueNameConverter;
import net.java.ao.schema.ddl.DDLField;
import net.java.ao.schema.ddl.DDLIndex;
import net.java.ao.schema.ddl.DDLIndexField;
import net.java.ao.schema.ddl.DDLTable;
import net.java.ao.schema.ddl.SQLAction;
import net.java.ao.types.TypeManager;
import net.java.ao.types.TypeQualifiers;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static com.google.common.collect.Iterables.concat;
/**
* @author Daniel Spiewak
*/
public class MySQLDatabaseProvider extends DatabaseProvider {
public static final String TRUNCATE_TO_255_CHARACTERS_FUNCTION = "(255)";
public MySQLDatabaseProvider(DisposableDataSource dataSource) {
super(dataSource, null, TypeManager.mysql());
}
@Override
protected String renderAutoIncrement() {
return "AUTO_INCREMENT";
}
@Override
protected String renderAppend() {
return "ENGINE=InnoDB";
}
@Override
protected String renderUnique(UniqueNameConverter uniqueNameConverter, DDLTable table, DDLField field) {
return "";
}
@Override
protected String renderQueryLimit(final Query query) {
StringBuilder sql = new StringBuilder();
// use the "LIMIT [, ] " style, with (2^64-1) meaning "unlimited"
int offset = query.getOffset();
int limit = query.getLimit();
if (offset > 0) {
sql.append(" LIMIT ");
sql.append(offset);
sql.append(", ");
if (limit >= 0) {
sql.append(limit);
} else {
sql.append("18446744073709551615");
}
} else if (limit >= 0) {
sql.append(" LIMIT ");
sql.append(limit);
}
return sql.toString();
}
@Override
protected String renderConstraintsForTable(UniqueNameConverter uniqueNameConverter, DDLTable table) {
StringBuilder back = new StringBuilder(super.renderConstraintsForTable(uniqueNameConverter, table));
for (DDLField field : table.getFields()) {
if (field.isUnique()) {
back.append(" CONSTRAINT ").append(uniqueNameConverter.getName(table.getName(), field.getName())).append(" UNIQUE(").append(processID(field.getName())).append("),\n");
}
}
return back.toString();
}
@Override
protected Iterable renderAlterTableAddColumn(NameConverters nameConverters, DDLTable table, DDLField field) {
final Iterable back = super.renderAlterTableAddColumn(nameConverters, table, field);
if (field.isUnique()) {
return concat(back, ImmutableList.of(alterAddUniqueConstraint(nameConverters, table, field)));
}
return back;
}
private SQLAction alterAddUniqueConstraint(NameConverters nameConverters, DDLTable table, DDLField field) {
return SQLAction.of(new StringBuilder().append("ALTER TABLE ").append(withSchema(table.getName())).append(" ADD CONSTRAINT ").append(nameConverters.getUniqueNameConverter().getName(table.getName(), field.getName())).append(" UNIQUE (").append(processID(field.getName())).append(")"));
}
@Override
protected Iterable renderAlterTableChangeColumn(NameConverters nameConverters, DDLTable table, DDLField oldField, DDLField field) {
final ImmutableList.Builder back = ImmutableList.builder();
back.addAll(renderDropAccessoriesForField(nameConverters, table, oldField));
back.add(renderAlterTableChangeColumnStatement(nameConverters, table, oldField, field, renderFieldOptionsInAlterColumn()));
if (oldField.isUnique() && !field.isUnique()) {
back.add(SQLAction.of(new StringBuilder().append("ALTER TABLE ").append(withSchema(table.getName())).append(" DROP INDEX ").append(nameConverters.getUniqueNameConverter().getName(table.getName(), field.getName()))));
}
if (!oldField.isUnique() && field.isUnique()) {
back.add(alterAddUniqueConstraint(nameConverters, table, field));
}
back.addAll(renderAccessoriesForField(nameConverters, table, field));
return back.build();
}
@Override
protected SQLAction renderCreateIndex(IndexNameConverter indexNameConverter, DDLIndex index) {
String statement = "CREATE" + (index.isUnique() ? " UNIQUE" : "") + " INDEX " + processID(index.getIndexName())
+ " ON " + processID(index.getTable()) +
Stream.of(index.getFields())
.map(this::appendLength)
.collect(Collectors.joining(",", "(", ")"));
return SQLAction.of(statement);
}
/**
* MySQL has an internal limitation that prevents "long" indexes. Its default behaviour is to truncate them
* silently, but some settings cause index creation to fail instead. When creating an index on columns that
* have length data available, if the length is "too long", create a prefix index instead.
*
* When MySQL silently truncates a "long" index, the prefix index it creates is 255 characters. This
* emulates that behaviour.
*
* @return index field name with length declaration if necessary
*/
private String appendLength(DDLIndexField indexField) {
TypeQualifiers qualifiers = indexField.getType().getQualifiers();
if (qualifiers.hasStringLength() && qualifiers.getStringLength() > 255) {
return processID(indexField.getFieldName()) + TRUNCATE_TO_255_CHARACTERS_FUNCTION;
} else {
return processID(indexField.getFieldName());
}
}
@Override
public SQLAction renderCreateCompositeIndex(String tableName, String indexName, List fields) {
StringBuilder statement = new StringBuilder();
statement.append("CREATE INDEX " + processID(indexName));
statement.append(" ON " + processID(tableName));
statement.append(" (");
boolean needDelimiter = false;
for (String field : fields) {
if (needDelimiter) {
statement.append(",");
}
statement.append(processID(field));
needDelimiter = true;
}
statement.append(")");
return SQLAction.of(statement);
}
public void putNull(PreparedStatement stmt, int index) throws SQLException {
stmt.setString(index, null);
}
@Override
protected Set getReservedWords() {
return RESERVED_WORDS;
}
@Override
public boolean isCaseSensitive() {
return FileSystemUtils.isCaseSensitive();
}
/**
* List of reserved words from MySQL documentation
*/
private static final Set RESERVED_WORDS = ImmutableSet.of(
"_FILENAME",
"ACCESSIBLE", "ADD", "ALL", "ALTER", "ANALYZE", "AND", "AS", "ASC", "ASENSITIVE",
"BEFORE", "BETWEEN", "BIGINT", "BINARY", "BLOB", "BOTH", "BY",
"CALL", "CASCADE", "CASE", "CHANGE", "CHAR", "CHARACTER", "CHECK", "COLLATE", "COLUMN", "COLUMNS",
"CONDITION", "CONNECTION", "CONSTRAINT", "CONTINUE", "CONVERT", "CREATE", "CROSS", "CUBE", "CUME_DIST",
"CURRENT_DATE", "CURRENT_TIME", "CURRENT_TIMESTAMP", "CURRENT_USER", "CURSOR",
"DATABASE", "DATABASES", "DAY_HOUR", "DAY_MICROSECOND", "DAY_MINUTE", "DAY_SECOND", "DEC", "DECIMAL",
"DECLARE", "DEFAULT", "DELAYED", "DELETE", "DENSE_RANK", "DESC", "DESCRIBE", "DETERMINISTIC", "DISTINCT",
"DISTINCTROW", "DIV", "DOUBLE", "DROP", "DUAL",
"EACH", "ELSE", "ELSEIF", "EMPTY", "ENCLOSED", "ESCAPED","EXCEPT", "EXISTS", "EXIT", "EXPLAIN",
"FALSE", "FETCH", "FIELDS", "FIRST_VALUE", "FLOAT", "FLOAT4", "FLOAT8", "FOR", "FORCE", "FOREIGN", "FROM",
"FULLTEXT", "FUNCTION",
"GENERATED", "GET", "GOTO", "GRANT", "GROUP", "GROUPING", "GROUPS",
"HAVING", "HIGH_PRIORITY", "HOUR_MICROSECOND", "HOUR_MINUTE", "HOUR_SECOND",
"IF", "IGNORE", "IN", "INDEX", "INFILE", "INNER", "INOUT", "INSENSITIVE", "INSERT", "INT", "INT1", "INT2",
"INT3", "INT4", "INT8", "INTEGER", "INTERSECT", "INTERVAL", "INTO", "IO_AFTER_GTIDS", "IO_BEFORE_GTIDS",
"IS", "ITERATE",
"JOIN", "JSON_TABLE",
"KEY", "KEYS", "KILL",
"LABEL", "LAG", "LAST_VALUE", "LATERAL", "LEAD", "LEADING", "LEAVE", "LEFT", "LIKE", "LIMIT", "LINEAR",
"LINES", "LOAD", "LOCALTIME", "LOCALTIMESTAMP", "LOCK", "LONG", "LONGBLOB", "LONGTEXT", "LOOP",
"LOW_PRIORITY",
"MASTER_BIND", "MASTER_SSL_VERIFY_SERVER_CERT", "MANUAL", "MATCH", "MAXVALUE", "MEDIUMBLOB", "MEDIUMINT",
"MEDIUMTEXT", "MIDDLEINT", "MINUTE_MICROSECOND","MINUTE_SECOND", "MOD", "MODIFIES",
"NATURAL", "NOT", "NO_WRITE_TO_BINLOG", "NTH_VALUE", "NTILE", "NULL", "NUMERIC",
"OF", "ON", "OPTIMIZE", "OPTIMIZER_COST", "OPTIMIZER_COSTS", "OPTION", "OPTIONALLY", "OR", "ORDER", "OUT",
"OUTER", "OUTFILE", "OVER",
"PARALLEL", "PARTITION", "PERCENT_RANK", "PRECISION", "PRIMARY", "PRIVILEGES", "PROCEDURE", "PURGE",
"QUALIFY",
"RANGE", "RANK", "READ", "READS", "READ_WRITE", "REAL", "RECURSIVE", "REFERENCES", "REGEXP", "RELEASE",
"RENAME", "REPEAT", "REPLACE", "REQUIRE", "RESIGNAL", "RESTRICT", "RETURN", "REVOKE", "RIGHT",
"RLIKE", "ROW", "ROWS", "ROW_NUMBER",
"SCHEMA", "SCHEMAS", "SECOND_MICROSECOND", "SELECT", "SENSITIVE", "SEPARATOR", "SET", "SHOW", "SIGNAL",
"SMALLINT", "SONAME", "SPATIAL", "SPECIFIC", "SQL", "SQLEXCEPTION", "SQLSTATE", "SQLWARNING",
"SQL_BIG_RESULT", "SQL_CALC_FOUND_ROWS", "SQL_SMALL_RESULT", "SSL", "STARTING", "STORED", "STRAIGHT_JOIN",
"SYSTEM",
"TABLE", "TABLES", "TABLESAMPLE", "TERMINATED", "THEN", "TINYBLOB", "TINYINT", "TINYTEXT", "TO", "TRAILING",
"TRIGGER", "TRUE",
"UNDO", "UNION", "UNIQUE", "UNLOCK", "UNSIGNED", "UPDATE", "UPGRADE", "USAGE", "USE", "USING", "UTC_DATE",
"UTC_TIME", "UTC_TIMESTAMP",
"VALUES", "VARBINARY", "VARCHAR", "VARCHARACTER", "VARYING", "VIRTUAL",
"WHEN", "WHERE", "WHILE", "WINDOW", "WITH", "WRITE",
"XOR", "YEAR_MONTH", "ZEROFILL"
);
}