com.jn.sqlhelper.dialect.Dialect Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2019 the original author or authors.
 *
 * Licensed under the LGPL, Version 3.0 (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.gnu.org/licenses/lgpl-3.0.html
 *
 * 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.jn.sqlhelper.dialect;

import com.jn.langx.annotation.NonNull;
import com.jn.sqlhelper.common.ddl.model.DatabaseDescription;
import com.jn.sqlhelper.dialect.internal.urlparser.UrlParser;
import com.jn.sqlhelper.dialect.likeescaper.LikeEscaper;
import com.jn.sqlhelper.dialect.pagination.RowSelection;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public interface Dialect extends LikeEscaper {
    String getDatabaseId();

    /**
     * Does this dialect support some form of limiting query results
     * via a sql clause?
     *
     * @return True if this dialect supports some form of LIMIT.
     */
    boolean isSupportsLimit();

    /**
     * Generally if there is no, limit applied to a query we do not apply any limits
     * to the sql query. This option forces that the limit be written to the sql query.
     *
     * @return True to force limit into soL query even if none specified in query, false otherwise
     */
    boolean isForceLimitUsage();

    /**
     * Does this dialect's LIMIT support (if any) additionally
     * support specifying an offset?
     *
     * @return True if the dialect supports an offset within the limit support
     */
    boolean isSupportsLimitOffset();

    /**
     * Does this dialect support bind variables (i.e., prepared statement
     * parameters) for its limit/offset?
     *
     * @return True if bind variables can be used; false otherwise.
     */
    boolean isSupportsVariableLimit();

    /**
     * Whether set limit or offset with placeholder '?'
     *
     * @return true if use '?' for limit or offset variable, else false
     */
    boolean isUseLimitInVariableMode();

    /**
     * Whether set limit or offset with placeholder '?'
     */
    void setUseLimitInVariableMode(boolean variableMode);

    /**
     * Given a limit and an offset, apply the limit clause to the query.
     *
     * @param query The query to which to apply the limit.
     * @return The modified query statement with the limit applied.
     */
    String getLimitSql(String query, RowSelection rowSelection);

    /**
     * Whether bind parameter in reverse or not.
     * 
     * Here assume the normal order is: $offset, $limit
     * so the reverse order is: $limit, $offset
     * 
     * Based on the assume,
     * case 1:
     * limit $offset, $limit  ==> reverse = false
     * case 2:
     * limit $limit offset $offset ==> reverse = true
     */
    boolean isBindLimitParametersInReverseOrder();

    /**
     * limit parameter will be bind in the first or not,
     * if first ,the {@link #bindLimitParametersAtStartOfQuery(RowSelection, PreparedStatement, int)} will be execute
     * else the {@link #bindLimitParametersAtEndOfQuery(RowSelection, PreparedStatement, int)} will be execute
     */
    boolean isBindLimitParametersFirst();

    int bindLimitParametersAtStartOfQuery(RowSelection paramRowSelection, PreparedStatement paramPreparedStatement, int paramInt)
            throws SQLException;

    int bindLimitParametersAtEndOfQuery(RowSelection paramRowSelection, PreparedStatement paramPreparedStatement, int paramInt)
            throws SQLException;

    boolean isUseMaxForLimit();

    int registerResultSetOutParameter(CallableStatement paramCallableStatement, int paramInt)
            throws SQLException;

    void setMaxRows(RowSelection paramRowSelection, PreparedStatement paramPreparedStatement)
            throws SQLException;

    /**
     * Database identifier: tableName, columnName, schema, keyword.
     *
     * @param identifier the name can be one of them: tableName, columnName, schemaName etc..
     * @return `identifier`
     */
    String getQuotedIdentifier(String identifier);

    /**
     * Get quote for symbol (e.g. table name, field name)
     *
     * @return the quote
     */
    char getBeforeQuote();

    /**
     * Get quote for symbol (e.g. table name, field name)
     *
     * @return the quote
     */
    char getAfterQuote();

    /**
     * Whether supports distinct keyword
     */
    boolean isSupportsDistinct();

    boolean isSupportsBatchUpdates();

    boolean isSupportsBatchSql();

    String generateTableDDL(@NonNull DatabaseDescription database, String catalog, String schema, @NonNull String tableName) throws SQLException;

    UrlParser getUrlParser();
}