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An JDBC datasource implementation.
/*
* Copyright 1999-2017 Alibaba Group Holding Ltd.
*
* 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 com.alibaba.druid.sql.dialect.db2.parser;
import com.alibaba.druid.sql.ast.SQLDataType;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLName;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.statement.SQLAlterTableAlterColumn;
import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
import com.alibaba.druid.sql.ast.statement.SQLTableSource;
import com.alibaba.druid.sql.dialect.db2.ast.stmt.DB2ValuesStatement;
import com.alibaba.druid.sql.parser.Lexer;
import com.alibaba.druid.sql.parser.ParserException;
import com.alibaba.druid.sql.parser.SQLCreateTableParser;
import com.alibaba.druid.sql.parser.SQLParserFeature;
import com.alibaba.druid.sql.parser.SQLStatementParser;
import com.alibaba.druid.sql.parser.Token;
import com.alibaba.druid.util.FnvHash;
import java.util.List;
public class DB2StatementParser extends SQLStatementParser {
public DB2StatementParser(String sql) {
super(new DB2ExprParser(sql));
}
public DB2StatementParser(String sql, SQLParserFeature... features) {
super(new DB2ExprParser(sql, features));
}
public DB2StatementParser(Lexer lexer) {
super(new DB2ExprParser(lexer));
}
public DB2SelectParser createSQLSelectParser() {
return new DB2SelectParser(this.exprParser, selectListCache);
}
public boolean parseStatementListDialect(List statementList) {
if (lexer.token() == Token.VALUES) {
lexer.nextToken();
DB2ValuesStatement stmt = new DB2ValuesStatement();
stmt.setExpr(this.exprParser.expr());
statementList.add(stmt);
return true;
}
return false;
}
public SQLCreateTableParser getSQLCreateTableParser() {
return new DB2CreateTableParser(this.exprParser);
}
protected SQLAlterTableAlterColumn parseAlterColumn() {
if (lexer.token() == Token.COLUMN) {
lexer.nextToken();
}
SQLColumnDefinition column = this.exprParser.parseColumn();
SQLAlterTableAlterColumn alterColumn = new SQLAlterTableAlterColumn();
alterColumn.setColumn(column);
if (column.getDataType() == null && column.getConstraints().isEmpty()) {
if (lexer.token() == Token.SET) {
lexer.nextToken();
if (lexer.token() == Token.NOT) {
lexer.nextToken();
accept(Token.NULL);
alterColumn.setSetNotNull(true);
} else if (lexer.token() == Token.DEFAULT) {
lexer.nextToken();
SQLExpr defaultValue = this.exprParser.expr();
alterColumn.setSetDefault(defaultValue);
} else if (lexer.identifierEquals(FnvHash.Constants.DATA)) {
lexer.nextToken();
acceptIdentifier("TYPE");
SQLDataType dataType = this.exprParser.parseDataType();
alterColumn.setDataType(dataType);
} else {
throw new ParserException("TODO : " + lexer.info());
}
} else if (lexer.token() == Token.DROP) {
lexer.nextToken();
if (lexer.token() == Token.NOT) {
lexer.nextToken();
accept(Token.NULL);
alterColumn.setDropNotNull(true);
} else {
accept(Token.DEFAULT);
alterColumn.setDropDefault(true);
}
}
}
return alterColumn;
}
@Override
public SQLDeleteStatement parseDeleteStatement() {
SQLDeleteStatement deleteStatement = new SQLDeleteStatement(getDbType());
if (lexer.token() == Token.DELETE) {
lexer.nextToken();
if (lexer.token() == (Token.FROM)) {
lexer.nextToken();
}
if (lexer.token() == Token.COMMENT) {
lexer.nextToken();
}
SQLName tableName = exprParser.name();
deleteStatement.setTableName(tableName);
if (lexer.token() == Token.FROM) {
lexer.nextToken();
SQLTableSource tableSource = createSQLSelectParser().parseTableSource();
deleteStatement.setFrom(tableSource);
}
// try to parse alias
deleteStatement.setAlias(tableAlias());
}
if (lexer.token() == (Token.WHERE)) {
lexer.nextToken();
SQLExpr where = this.exprParser.expr();
deleteStatement.setWhere(where);
}
return deleteStatement;
}
}