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An JDBC datasource implementation.
/*
* Copyright 1999-2018 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.builder;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.util.JdbcConstants;
/**
* Created by wenshao on 09/07/2017.
*/
public class FunctionBuilder {
private final String dbType;
public FunctionBuilder(String dbType) {
this.dbType = dbType;
}
// for character function
public SQLMethodInvokeExpr length(SQLExpr expr) {
return new SQLMethodInvokeExpr("length", null, expr);
}
public SQLMethodInvokeExpr lower(SQLExpr expr) {
return new SQLMethodInvokeExpr("lower", null, expr);
}
public SQLMethodInvokeExpr upper(SQLExpr expr) {
return new SQLMethodInvokeExpr("upper", null, expr);
}
public SQLMethodInvokeExpr substr(SQLExpr expr) {
return new SQLMethodInvokeExpr("substr", null, expr);
}
public SQLMethodInvokeExpr ltrim(SQLExpr expr) {
return new SQLMethodInvokeExpr("ltrim", null, expr);
}
public SQLMethodInvokeExpr rtrim(SQLExpr expr) {
return new SQLMethodInvokeExpr("rtrim", null, expr);
}
public SQLMethodInvokeExpr trim(SQLExpr expr) {
return new SQLMethodInvokeExpr("trim", null, expr);
}
public SQLMethodInvokeExpr ifnull(SQLExpr expr1, SQLExpr expr2) {
if (JdbcConstants.ALIYUN_ADS.equals(dbType)
|| JdbcConstants.PRESTO.equals(dbType)
|| JdbcConstants.ODPS.equals(dbType)) {
return new SQLMethodInvokeExpr("coalesce", null, expr1, expr2);
}
if (JdbcConstants.ORACLE.equals(dbType)) {
return new SQLMethodInvokeExpr("nvl", null, expr1, expr2);
}
if (JdbcConstants.SQL_SERVER.equals(dbType)) {
return new SQLMethodInvokeExpr("isnull", null, expr1, expr2);
}
return new SQLMethodInvokeExpr("ifnull", null, expr1, expr2);
}
}