com.querydsl.sql.TeradataTemplates Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of querydsl-sql Show documentation
SQL support for Querydsl
There is a newer version: 6.10.1
/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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.querydsl.sql;

import com.querydsl.core.QueryMetadata;
import com.querydsl.core.types.Ops;
import java.sql.Types;

/**
 * {@code TeradataTemplates} is a SQL dialect for Teradata
 *
 * @author tiwe
 */
public class TeradataTemplates extends SQLTemplates {

  @SuppressWarnings("FieldNameHidesFieldInSuperclass") // Intentional
  public static final TeradataTemplates DEFAULT = new TeradataTemplates();

  public static Builder builder() {
    return new Builder() {
      @Override
      protected SQLTemplates build(char escape, boolean quote) {
        return new TeradataTemplates(escape, quote);
      }
    };
  }

  private String limitOffsetStart = "\nqualify row_number() over (order by ";

  private String limitTemplate = " <= {0}";

  private String limitOffsetTemplate = " between {0} and {1}";

  private String offsetTemplate = " > {0}";

  public TeradataTemplates() {
    this('\\', false);
  }

  public TeradataTemplates(boolean quote) {
    this('\\', quote);
  }

  public TeradataTemplates(char escape, boolean quote) {
    super("\"", escape, quote);
    setNullsFirst(null);
    setNullsLast(null);
    setDummyTable(null);
    setCountViaAnalytics(true);
    setDefaultValues("\ndefault values");
    setBatchToBulkSupported(false);

    setPrecedence(Precedence.ARITH_LOW + 1, Ops.CONCAT);
    setPrecedence(Precedence.COMPARISON, Ops.EQ, Ops.EQ_IGNORE_CASE, Ops.NE);

    add(Ops.NE, "{0} <> {1}");
    add(Ops.MOD, "{0} % {1}", Precedence.ARITH_HIGH);

    // String
    add(Ops.STRING_LENGTH, "character_length({0})");
    add(Ops.INDEX_OF, "(instr({0},{1})-1)");
    add(Ops.INDEX_OF_2ARGS, "(instr({0},{1},{2+'1'})-1)");
    add(Ops.STRING_CAST, "cast({0} as varchar(255))");
    add(Ops.StringOps.LOCATE, "instr({1},{0})");
    add(Ops.StringOps.LOCATE2, "instr({1},{0},{2s})");
    add(Ops.StringOps.LEFT, "substr({0}, 1, {1})");
    add(Ops.StringOps.RIGHT, "substr({0}, (character_length({0})-{1s}) + 1, {1})");
    add(Ops.MATCHES, "(regexp_instr({0}, {1}) = 1)");
    add(Ops.MATCHES_IC, "(regex_instr({0l}, {1}) = 1)");

    // Number
    add(Ops.MOD, "{0} mod {1}");
    add(Ops.MathOps.LOG, "(ln({0}) / ln({1}))");
    add(Ops.MathOps.RANDOM, "cast(random(0, 1000000000) as numeric(20,10))/1000000000");
    add(Ops.MathOps.COT, "(cos({0}) / sin({0}))");
    add(Ops.MathOps.COTH, "(exp({0*'2'}) + 1) / (exp({0*'2'}) - 1)");

    // Date / time
    add(Ops.DateTimeOps.DATE, "cast({0} as date)");

    add(Ops.DateTimeOps.WEEK, "(td_week_of_year({0}) + 1)"); // non-standard
    add(Ops.DateTimeOps.DAY_OF_WEEK, "td_day_of_week({0})"); // non-standard
    add(Ops.DateTimeOps.DAY_OF_YEAR, "td_day_of_year({0})"); // non-standard
    add(Ops.DateTimeOps.YEAR_WEEK, "(extract (year from {0}) * 100 + td_week_of_year({0}))");

    add(Ops.DateTimeOps.ADD_YEARS, "{0} + interval '{1s}' year");
    add(Ops.DateTimeOps.ADD_MONTHS, "{0} + interval '{1s}' month");
    add(Ops.DateTimeOps.ADD_DAYS, "{0} + interval '{1s}' day");

    add(Ops.DateTimeOps.DIFF_YEARS, "cast((({1} - {0}) year) as integer)");
    add(Ops.DateTimeOps.DIFF_MONTHS, "cast((({1} - {0}) month) as integer)"); // FIXME
    add(Ops.DateTimeOps.DIFF_DAYS, "({1} - {0})");

    add(Ops.DateTimeOps.TRUNC_YEAR, "trunc({0}, 'year')");
    add(Ops.DateTimeOps.TRUNC_MONTH, "trunc({0}, 'month')");
    add(Ops.DateTimeOps.TRUNC_WEEK, "trunc({0}, 'w')");
    add(Ops.DateTimeOps.TRUNC_DAY, "trunc({0}, 'dd')");
    add(Ops.DateTimeOps.TRUNC_HOUR, "trunc({0}, 'hh24')");
    add(Ops.DateTimeOps.TRUNC_MINUTE, "trunc({0}, 'mi')");
    add(Ops.DateTimeOps.TRUNC_SECOND, "{0}"); // not truncated

    addTypeNameToCode("byteint", Types.BIT, true);
    addTypeNameToCode("byteint", Types.BOOLEAN, true);
    addTypeNameToCode("byteint", Types.TINYINT, true);
    addTypeNameToCode("float", Types.DOUBLE, true);
  }

  @Override
  public String getCastTypeNameForCode(int code) {
    switch (code) {
      case Types.VARCHAR:
        return "varchar(4000)";
      default:
        return super.getCastTypeNameForCode(code);
    }
  }

  @Override
  protected void serializeModifiers(QueryMetadata metadata, SQLSerializer context) {
    var mod = metadata.getModifiers();
    context.append(limitOffsetStart);
    if (!metadata.getOrderBy().isEmpty()) {
      context.handleOrderBy(metadata.getOrderBy());
    } else {
      context.append("1");
    }
    context.append(")");
    if (mod.getLimit() == null) {
      context.handle(offsetTemplate, mod.getOffset());
    } else if (mod.getOffset() == null) {
      context.handle(limitTemplate, mod.getLimit());
    } else {
      context.handle(limitOffsetTemplate, mod.getOffset() + 1, mod.getOffset() + mod.getLimit());
    }
  }
}