• Home
• org.hotrodorm.hotrod
• hotrod-livesql
• 4.3.3
• source code
• PostgreSQLDialect.java

×

Project download

Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $

You can buy this project and download/modify it how often you want.

org.hotrod.runtime.livesql.dialects.PostgreSQLDialect Maven / Gradle / Ivy

package org.hotrod.runtime.livesql.dialects;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

import org.hotrod.runtime.livesql.exceptions.UnsupportedLiveSQLFeatureException;
import org.hotrod.runtime.livesql.expressions.datetime.DateTimeExpression;
import org.hotrod.runtime.livesql.expressions.numbers.NumberExpression;
import org.hotrod.runtime.livesql.expressions.strings.StringExpression;
import org.hotrod.runtime.livesql.ordering.OrderingTerm;
import org.hotrod.runtime.livesql.queries.select.CrossJoin;
import org.hotrod.runtime.livesql.queries.select.FullOuterJoin;
import org.hotrod.runtime.livesql.queries.select.InnerJoin;
import org.hotrod.runtime.livesql.queries.select.Join;
import org.hotrod.runtime.livesql.queries.select.JoinLateral;
import org.hotrod.runtime.livesql.queries.select.LeftJoinLateral;
import org.hotrod.runtime.livesql.queries.select.LeftOuterJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalFullOuterJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalInnerJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalLeftOuterJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalRightOuterJoin;
import org.hotrod.runtime.livesql.queries.select.QueryWriter;
import org.hotrod.runtime.livesql.queries.select.RightOuterJoin;
import org.hotrod.runtime.livesql.queries.select.UnionJoin;
import org.hotrodorm.hotrod.utils.Separator;

public class PostgreSQLDialect extends LiveSQLDialect {

  public PostgreSQLDialect(final boolean discovered, final String productName, final String productVersion,
      final int majorVersion, final int minorVersion) {
    super(discovered, productName, productVersion, majorVersion, minorVersion);
  }

  // WITH rendering

  @Override
  public WithRenderer getWithRenderer() {
    return (c) -> "WITH" + (c ? " RECURSIVE" : "");
  }

  // From rendering

  @Override
  public FromRenderer getFromRenderer() {
    return () -> "";
  }
  // Table Expression rendering

  @Override
  public TableExpressionRenderer getTableExpressionRenderer() {
    return (columns) -> " ("
        + Arrays.stream(columns).map(c -> this.canonicalToNatural(c)).collect(Collectors.joining(", ")) + ")";
  }

  // Join rendering

  @Override
  public JoinRenderer getJoinRenderer() {
    return new JoinRenderer() {

      @Override
      public String renderJoinKeywords(final Join join) throws UnsupportedLiveSQLFeatureException {
        if (join instanceof InnerJoin) {
          return "JOIN";
        } else if (join instanceof LeftOuterJoin) {
          return "LEFT JOIN";
        } else if (join instanceof RightOuterJoin) {
          return "RIGHT JOIN";
        } else if (join instanceof FullOuterJoin) {
          return "FULL JOIN";
        } else if (join instanceof CrossJoin) {
          return "CROSS JOIN";
        } else if (join instanceof NaturalInnerJoin) {
          return "NATURAL JOIN";
        } else if (join instanceof NaturalLeftOuterJoin) {
          return "NATURAL LEFT JOIN";
        } else if (join instanceof NaturalRightOuterJoin) {
          return "NATURAL RIGHT JOIN";
        } else if (join instanceof NaturalFullOuterJoin) {
          return "NATURAL FULL JOIN";
        } else if (join instanceof JoinLateral) {
          if (versionIsAtLeast(9, 3)) {
            return "JOIN LATERAL";
          }
          throw new UnsupportedLiveSQLFeatureException(
              "LiveSQL supports lateral joins in the PostgreSQL database starting in version 9.3, "
                  + "but the current version is " + renderVersion());
        } else if (join instanceof LeftJoinLateral) {
          if (versionIsAtLeast(9, 3)) {
            return "LEFT JOIN LATERAL";
          }
          throw new UnsupportedLiveSQLFeatureException(
              "LiveSQL supports lateral joins in the PostgreSQL database starting in version 9.3, "
                  + "but the current version is " + renderVersion());
        } else if (join instanceof UnionJoin) {
          throw new UnsupportedLiveSQLFeatureException("Union joins are not supported in PostgreSQL database");
        } else {
          throw new UnsupportedLiveSQLFeatureException(
              "Invalid join type (" + join.getClass().getSimpleName() + ") in PostgreSQL database");
        }
      }

      @Override
      public String renderOptionalOnPredicate(final Join join) throws UnsupportedLiveSQLFeatureException {
        if (join instanceof InnerJoin) {
          return "";
        } else if (join instanceof LeftOuterJoin) {
          return "";
        } else if (join instanceof RightOuterJoin) {
          return "";
        } else if (join instanceof FullOuterJoin) {
          return "";
        } else if (join instanceof CrossJoin) {
          return "";
        } else if (join instanceof NaturalInnerJoin) {
          return "";
        } else if (join instanceof NaturalLeftOuterJoin) {
          return "";
        } else if (join instanceof NaturalRightOuterJoin) {
          return "";
        } else if (join instanceof NaturalFullOuterJoin) {
          return "";
        } else if (join instanceof JoinLateral) {
          return " ON true";
        } else if (join instanceof LeftJoinLateral) {
          return " ON true";
        } else if (join instanceof UnionJoin) {
          throw new UnsupportedLiveSQLFeatureException("Union joins are not supported in Oracle database");
        } else {
          throw new UnsupportedLiveSQLFeatureException(
              "Invalid join type (" + join.getClass().getSimpleName() + ") in Oracle database");
        }
      }

    };
  }

  // Pagination rendering

  public PaginationRenderer getPaginationRenderer() {
    return new PaginationRenderer() {

      @Override
      public PaginationType getPaginationType(final Integer offset, final Integer limit) {
        return offset != null || limit != null ? PaginationType.BOTTOM : null;
      }

      @Override
      public void renderTopPagination(final Integer offset, final Integer limit, final QueryWriter w) {
        throw new UnsupportedLiveSQLFeatureException("Pagination can only be rendered at the bottom in PostgreSQL");
      }

      @Override
      public void renderBottomPagination(final Integer offset, final Integer limit, final QueryWriter w) {
        if (limit != null) {
          if (offset != null) {
            w.write("\nLIMIT " + limit + " OFFSET " + offset);
          } else {
            w.write("\nLIMIT " + limit);
          }
        } else {
          w.write("\nOFFSET " + offset);
        }
      }

      @Override
      public void renderBeginEnclosingPagination(final Integer offset, final Integer limit, final QueryWriter w) {
        throw new UnsupportedLiveSQLFeatureException("Pagination can only be rendered at the bottom in PostgreSQL");
      }

      @Override
      public void renderEndEnclosingPagination(final Integer offset, final Integer limit, final QueryWriter w) {
        throw new UnsupportedLiveSQLFeatureException("Pagination can only be rendered at the bottom in PostgreSQL");
      }

    };
  }

  // Set operation rendering

  @Override
  public SetOperatorRenderer getSetOperationRenderer() {
    return new SetOperatorRenderer() {

      @Override
      public void renderUnion(final QueryWriter w) {
        w.write("UNION");
      }

      @Override
      public void renderUnionAll(final QueryWriter w) {
        w.write("UNION ALL");
      }

      @Override
      public void renderExcept(final QueryWriter w) {
        w.write("EXCEPT");
      }

      @Override
      public void renderExceptAll(final QueryWriter w) {
        w.write("EXCEPT ALL");
      }

      @Override
      public void renderIntersect(final QueryWriter w) {
        w.write("INTERSECT");
      }

      @Override
      public void renderIntersectAll(final QueryWriter w) {
        w.write("INTERSECT ALL");
      }

    };
  }

  // Function rendering

  @Override
  public FunctionRenderer getFunctionRenderer() {
    return new FunctionRenderer() {

      // General purpose functions

      @Override
      public void groupConcat(final QueryWriter w, final boolean distinct, final StringExpression value,
          final List ordering, final StringExpression separator) {
        if (!versionIsAtLeast(9)) {
          throw new UnsupportedLiveSQLFeatureException("This PostgreSQL version (" + renderVersion()
              + ") does not support the GROUP_CONCAT() function (string_agg()). Only available on PostgreSQL 9.0 or newer");
        }
        if (distinct) {
          throw new UnsupportedLiveSQLFeatureException(
              "PostgreSQL does not support DISTINCT on the GROUP_CONCAT() function (string_agg())");
        }
        if (separator == null) {
          throw new UnsupportedLiveSQLFeatureException(
              "PostgreSQL requires the separator to be specified on the GROUP_CONCAT() function (string_agg())");
        }
        w.write("string_agg(");
        value.renderTo(w);
        w.write(", ");
        separator.renderTo(w);
        if (ordering != null && !ordering.isEmpty()) {
          w.write(" ORDER BY ");
          Separator sep = new Separator();
          for (OrderingTerm t : ordering) {
            w.write(sep.render());
            t.renderTo(w);
          }
        }
        w.write(")");
      }

      // Arithmetic functions

      @Override
      public void logarithm(final QueryWriter w, final NumberExpression x, final NumberExpression base) {
        if (base == null) {
          this.write(w, "ln", x);
        } else {
          this.write(w, "log", base, x);
        }
      }

      // String functions

      @Override
      public void locate(final QueryWriter w, final StringExpression substring, final StringExpression string,
          final NumberExpression from) {
        if (from == null) {
          this.write(w, "strpos", string, substring);
        } else {
          throw new UnsupportedLiveSQLFeatureException(
              "PostgreSQL does not support the parameter 'from' in the LOCATE function ('strpos' in PostgreSQL lingo)");
        }
      }

      // Date/Time functions

      @Override
      public void currentDate(final QueryWriter w) {
        w.write("current_date");
      }

      @Override
      public void currentTime(final QueryWriter w) {
        w.write("current_time");
      }

      @Override
      public void currentDateTime(final QueryWriter w) {
        w.write("current_timestamp");
      }

      @Override
      public void date(final QueryWriter w, final DateTimeExpression datetime) {
        datetime.renderTo(w);
        w.write("::date");
      }

      @Override
      public void time(final QueryWriter w, final DateTimeExpression datetime) {
        datetime.renderTo(w);
        w.write("::time");
      }

      @Override
      public void dateTime(final QueryWriter w, final DateTimeExpression date, final DateTimeExpression time) {
        w.write("(");
        date.renderTo(w);
        w.write(" + ");
        time.renderTo(w);
        w.write(")");
      }

    };
  }

  // New SQL Identifier rendering

  private final String UNQUOTED_NATURAL = "[A-Za-z][A-Za-z0-9_]*";
  private final String UNQUOTED_CANONICAL = "[a-z][a-z0-9_]*";

  @Override
  public String naturalToCanonical(final String natural) {
    if (natural == null)
      return null;
    if (natural.matches(UNQUOTED_NATURAL)) {
      return natural.toLowerCase();
    }
    return natural;
  }

  @Override
  public String canonicalToNatural(final String canonical) {
    if (canonical == null)
      return null;
    if (canonical.matches(UNQUOTED_CANONICAL)) {
      return canonical.toLowerCase();
    } else {
      return "\"" + canonical.replace("\"", "\"\"") + "\"";
    }
  }

  @Override
  public DateTimeLiteralRenderer getDateTimeLiteralRenderer() {
    return new DateTimeLiteralRenderer() {

      @Override
      public String renderDate(final String isoDate) {
        return "DATE '" + isoDate + "'";
      }

      @Override
      public String renderTime(final String isoTime, final int precision) {
        return "TIME '" + isoTime + "'";
      }

      @Override
      public String renderTimestamp(final String isoTimestamp, final int precision) {
        return "TIMESTAMP '" + isoTimestamp + "'";
      }

      @Override
      public String renderOffsetTime(final String isoTime, final String isoOffset, final int precision) {
        return "TIME WITH TIME ZONE '" + isoTime + isoOffset + "'";
      }

      @Override
      public String renderOffsetTimestamp(final String isoTimestamp, final String isoOffset, final int precision) {
        return "TIMESTAMP WITH TIME ZONE '" + isoTimestamp + isoOffset + "'";
      }

    };
  }

  @Override
  public BooleanLiteralRenderer getBooleanLiteralRenderer() {
    return new BooleanLiteralRenderer() {

      @Override
      public void renderTrue(final QueryWriter w) {
        w.write("true");
      }

      @Override
      public void renderFalse(final QueryWriter w) {
        w.write("false");
      }

    };
  }

  @Override
  public boolean mandatoryColumnNamesInRecursiveCTEs() {
    return false;
  }

}