com.glaf.core.util.JdbcUtils.java Source code

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Here is the source code for com.glaf.core.util.JdbcUtils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.glaf.core.util;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.apache.ibatis.session.SqlSession;

import com.glaf.core.entity.SqlExecutor;

public final class JdbcUtils {

    public static void close(Connection con) {
        try {
            if (con != null && !con.isClosed()) {
                con.close();
            }
        } catch (SQLException ex) {
        }
    }

    public static void close(ResultSet rs) {
        try {
            if (rs != null) {
                rs.close();
                rs = null;
            }
        } catch (SQLException ex) {
        }
    }

    public static void close(SqlSession session) {
        try {
            if (session != null) {
                session.close();
            }
        } catch (Exception ex) {
        }
    }

    public static void close(Statement stmt) {
        try {
            if (stmt != null) {
                stmt.close();
                stmt = null;
            }
        } catch (SQLException ex) {
        }
    }

    public static void fillStatement(PreparedStatement stmt, List<Object> params) throws SQLException {
        if (params == null || params.size() == 0) {
            return;
        }
        for (int i = 0, len = params.size(); i < len; i++) {
            Object object = params.get(i);
            if (object != null) {
                if (object instanceof java.sql.Date) {
                    java.sql.Date sqlDate = (java.sql.Date) object;
                    stmt.setDate(i + 1, sqlDate);
                } else if (object instanceof java.sql.Time) {
                    java.sql.Time sqlTime = (java.sql.Time) object;
                    stmt.setTime(i + 1, sqlTime);
                } else if (object instanceof java.sql.Timestamp) {
                    Timestamp datetime = (Timestamp) object;
                    stmt.setTimestamp(i + 1, datetime);
                } else if (object instanceof java.util.Date) {
                    Timestamp datetime = DateUtils.toTimestamp((java.util.Date) object);
                    stmt.setTimestamp(i + 1, datetime);
                } else {
                    stmt.setObject(i + 1, object);
                }
            } else {
                stmt.setString(i + 1, null);
            }
        }
    }

    private static Map<String, Object> lowerKeyMap(Map<String, Object> params) {
        Map<String, Object> dataMap = new java.util.HashMap<String, Object>();
        Set<Entry<String, Object>> entrySet = params.entrySet();
        for (Entry<String, Object> entry : entrySet) {
            String key = entry.getKey();
            Object value = entry.getValue();
            dataMap.put(key, value);
            dataMap.put(key.toLowerCase(), value);
        }
        return dataMap;
    }

    public static SqlExecutor rebuildSQL(String sql, Map<String, Object> params) {
        if (sql == null || params == null) {
            return null;
        }
        SqlExecutor sqlExecutor = new SqlExecutor();
        List<Object> values = new java.util.ArrayList<Object>();
        Map<String, Object> dataMap = lowerKeyMap(params);
        StringBuffer sb = new StringBuffer(sql.length() + 1000);
        int begin = 0;
        int end = 0;
        boolean flag = false;
        for (int i = 0; i < sql.length(); i++) {
            if (sql.charAt(i) == '#' && sql.charAt(i + 1) == '{') {
                sb.append(sql.substring(end, i));
                begin = i + 2;
                flag = true;
            }
            if (flag && sql.charAt(i) == '}') {
                String temp = sql.substring(begin, i);
                temp = temp.toLowerCase();
                if (dataMap.get(temp) != null) {
                    Object value = dataMap.get(temp);
                    values.add(value);
                    sb.append(" ? ");
                    end = i + 1;
                    flag = false;
                } else {
                    sb.append(" ? ");
                    end = i + 1;
                    flag = false;
                    values.add(null);
                }
            }
            if (i == sql.length() - 1) {
                sb.append(sql.substring(end, i + 1));
            }
        }
        sqlExecutor.setParameter(values);
        sqlExecutor.setSql(sb.toString());
        return sqlExecutor;
    }

    public static void rollback(Connection con) {
        try {
            if (con != null && !con.isClosed()) {
                con.rollback();
            }
        } catch (SQLException ex) {
        }
    }

    private JdbcUtils() {
    }

}