SQLiteDialect.java

package org.hibernate.dialect;/*
 * The author disclaims copyright to this source code.  In place of
 * a legal notice, here is a blessing:
 *
 *    May you do good and not evil.
 *    May you find forgiveness for yourself and forgive others.
 *    May you share freely, never taking more than you give.
 *
 */

import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.JDBCException;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.AbstractAnsiTrimEmulationFunction;
import org.hibernate.dialect.function.NoArgSQLFunction;
import org.hibernate.dialect.function.SQLFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.exception.*;
import org.hibernate.type.StandardBasicTypes;

public class SQLiteDialect extends Dialect {
    public SQLiteDialect() {
        registerColumnType(Types.BIT, "boolean");
        registerColumnType(Types.TINYINT, "tinyint");
        registerColumnType(Types.SMALLINT, "smallint");
        registerColumnType(Types.INTEGER, "integer");
        registerColumnType(Types.BIGINT, "bigint");
        registerColumnType(Types.FLOAT, "float");
        registerColumnType(Types.REAL, "real");
        registerColumnType(Types.DOUBLE, "double");
        registerColumnType(Types.NUMERIC, "numeric($p, $s)");
        registerColumnType(Types.DECIMAL, "decimal");
        registerColumnType(Types.CHAR, "char");
        registerColumnType(Types.VARCHAR, "varchar($l)");
        registerColumnType(Types.LONGVARCHAR, "longvarchar");
        registerColumnType(Types.DATE, "date");
        registerColumnType(Types.TIME, "time");
        registerColumnType(Types.TIMESTAMP, "datetime");
        registerColumnType(Types.BINARY, "blob");
        registerColumnType(Types.VARBINARY, "blob");
        registerColumnType(Types.LONGVARBINARY, "blob");
        registerColumnType(Types.BLOB, "blob");
        registerColumnType(Types.CLOB, "clob");
        registerColumnType(Types.BOOLEAN, "boolean");

        registerFunction( "concat", new VarArgsSQLFunction(StandardBasicTypes.STRING, "", "||", "") );
        registerFunction( "mod", new SQLFunctionTemplate(StandardBasicTypes.INTEGER, "?1 % ?2" ) );
        registerFunction( "quote", new StandardSQLFunction("quote", StandardBasicTypes.STRING) );
        registerFunction( "random", new NoArgSQLFunction("random", StandardBasicTypes.INTEGER) );
        registerFunction( "round", new StandardSQLFunction("round") );
        registerFunction( "substr", new StandardSQLFunction("substr", StandardBasicTypes.STRING) );
        registerFunction( "trim", new AbstractAnsiTrimEmulationFunction() {
            protected SQLFunction resolveBothSpaceTrimFunction() {
                return new SQLFunctionTemplate(StandardBasicTypes.STRING, "trim(?1)");
            }

            protected SQLFunction resolveBothSpaceTrimFromFunction() {
                return new SQLFunctionTemplate(StandardBasicTypes.STRING, "trim(?2)");
            }

            protected SQLFunction resolveLeadingSpaceTrimFunction() {
                return new SQLFunctionTemplate(StandardBasicTypes.STRING, "ltrim(?1)");
            }

            protected SQLFunction resolveTrailingSpaceTrimFunction() {
                return new SQLFunctionTemplate(StandardBasicTypes.STRING, "rtrim(?1)");
            }

            protected SQLFunction resolveBothTrimFunction() {
                return new SQLFunctionTemplate(StandardBasicTypes.STRING, "trim(?1, ?2)");
            }

            protected SQLFunction resolveLeadingTrimFunction() {
                return new SQLFunctionTemplate(StandardBasicTypes.STRING, "ltrim(?1, ?2)");
            }

            protected SQLFunction resolveTrailingTrimFunction() {
                return new SQLFunctionTemplate(StandardBasicTypes.STRING, "rtrim(?1, ?2)");
            }
        } );
    }

    @Override
    public boolean supportsIdentityColumns() {
        return true;
    }

  /*
  public boolean supportsInsertSelectIdentity() {
    return true; // As specified in NHibernate dialect
  }
  */

    @Override
    public boolean hasDataTypeInIdentityColumn() {
        return false; // As specified in NHibernate dialect
    }

  /*
  public String appendIdentitySelectToInsert(String insertString) {
    return new StringBuffer(insertString.length()+30). // As specified in NHibernate dialect
      append(insertString).
      append("; ").append(getIdentitySelectString()).
      toString();
  }
  */

    @Override
    public String getIdentityColumnString() {
        // return "integer primary key autoincrement";
        return "integer";
    }

    @Override
    public String getIdentitySelectString() {
        return "select last_insert_rowid()";
    }

    @Override
    public boolean supportsLimit() {
        return true;
    }

    @Override
    public boolean bindLimitParametersInReverseOrder() {
        return true;
    }

    @Override
    protected String getLimitString(String query, boolean hasOffset) {
        return query + (hasOffset ? " limit ? offset ?" : " limit ?");
    }

    @Override
    public boolean supportsTemporaryTables() {
        return true;
    }

    @Override
    public String getCreateTemporaryTableString() {
        return "create temporary table if not exists";
    }

    @Override
    public Boolean performTemporaryTableDDLInIsolation() {
        return Boolean.FALSE;
    }

  /*
  @Override
  public boolean dropTemporaryTableAfterUse() {
    return true; // temporary tables are only dropped when the connection is closed. If the connection is pooled...
  }
  */

    @Override
    public boolean supportsCurrentTimestampSelection() {
        return true;
    }

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

    @Override
    public String getCurrentTimestampSelectString() {
        return "select current_timestamp";
    }

    private static final int SQLITE_BUSY = 5;
    private static final int SQLITE_LOCKED = 6;
    private static final int SQLITE_IOERR = 10;
    private static final int SQLITE_CORRUPT = 11;
    private static final int SQLITE_NOTFOUND = 12;
    private static final int SQLITE_FULL = 13;
    private static final int SQLITE_CANTOPEN = 14;
    private static final int SQLITE_PROTOCOL = 15;
    private static final int SQLITE_TOOBIG = 18;
    private static final int SQLITE_CONSTRAINT = 19;
    private static final int SQLITE_MISMATCH = 20;
    private static final int SQLITE_NOTADB = 26;

    @Override
    public boolean supportsUnionAll() {
        return true;
    }

    @Override
    public boolean hasAlterTable() {
        return false; // As specified in NHibernate dialect
    }

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

  /*
  public String getAddColumnString() {
    return "add column";
  }
  */

    @Override
    public String getForUpdateString() {
        return "";
    }

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

    @Override
    public String getDropForeignKeyString() {
        throw new UnsupportedOperationException("No drop foreign key syntax supported by SQLiteDialect");
    }

    @Override
    public String getAddForeignKeyConstraintString(String constraintName,
                                                   String[] foreignKey, String referencedTable, String[] primaryKey,
                                                   boolean referencesPrimaryKey) {
        throw new UnsupportedOperationException("No add foreign key syntax supported by SQLiteDialect");
    }

    @Override
    public String getAddPrimaryKeyConstraintString(String constraintName) {
        throw new UnsupportedOperationException("No add primary key syntax supported by SQLiteDialect");
    }

    @Override
    public boolean supportsIfExistsBeforeTableName() {
        return true;
    }

  /*
  public boolean supportsCascadeDelete() {
    return true;
  }
  */

  /* not case insensitive for unicode characters by default (ICU extension needed)
  public boolean supportsCaseInsensitiveLike() {
    return true;
  }
  */

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

    @Override
    public String getSelectGUIDString() {
        return "select hex(randomblob(16))";
    }
}