mybatis中幾種typeHandler的定義使用

1.存儲到數據庫, 將LONG數組轉換成字符串;從數據庫獲取數據, 將字符串轉為LONG數組

package com.winturn.utils.handler;

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

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

import com.winturn.utils.CommonJsonUtil;

/**
 * <p>Class: ArrayLongTypeHandler.java</p>
 * <p>Description: 存儲到數據庫, 將LONG數組轉換成字符串;
 *                 從數據庫獲取數據, 將字符串轉為LONG數組.
 </p>*/
public class ArrayLongTypeHandler extends BaseTypeHandler<Object> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i,
            Object parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, CommonJsonUtil.stringify(parameter));
    }

    @Override
    public Object getNullableResult(ResultSet rs, String columnName)
            throws SQLException {
        return CommonJsonUtil.parse3(rs.getString(columnName), Object.class);
    }

    @Override
    public Object getNullableResult(ResultSet rs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parse3(rs.getString(columnIndex), Object.class);
    }

    @Override
    public Object getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parse3(cs.getString(columnIndex), Object.class);
    }

}

2.存儲到數據庫, 將基本數據數組轉換成字符串;從數據庫獲取數據, 將字符串根據','拆分，轉為數組.

package com.winturn.utils.handler;

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

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

import com.winturn.utils.CommonJsonUtil;

/**
 * <p>Class: ArrayStringTypeHandler.java</p>
 * <p>Description: 存儲到數據庫, 將基本數據數組轉換成字符串;
 *                 從數據庫獲取數據, 將字符串根據','拆分，轉為數組.</p>
 *
 * 
 */
public class ArrayStringTypeHandler extends BaseTypeHandler<Object> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, Object parameter,
            JdbcType jdbcType) throws SQLException {
        ps.setString(i, CommonJsonUtil.stringify(parameter));
    }

    @Override
    public Object getNullableResult(ResultSet rs, String columnName)
            throws SQLException {
        return CommonJsonUtil.parse2(rs.getString(columnName), Object.class);
    }

    @Override
    public Object getNullableResult(ResultSet rs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parse2(rs.getString(columnIndex), Object.class);
    }

    @Override
    public Object getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parse2(cs.getString(columnIndex), Object.class);
    }

}

3.jsonarray 格式的字符串轉換為相應的數組

package com.winturn.utils.handler;

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

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

import com.winturn.utils.CommonJsonUtil;


/**
 * <p>Class: ArrayIntegerTypeHandler.java</p>
 * <p>Description: jsonarray 格式的字符串轉換為相應的數組 </p>
 * 
 */
public class JsonArrayTypeHandler extends BaseTypeHandler<Object> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i,
            Object parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, CommonJsonUtil.stringify(parameter));
    }

    @Override
    public Object getNullableResult(ResultSet rs, String columnName)
            throws SQLException {
        return CommonJsonUtil.parseJsonToArray(rs.getString(columnName), Object.class);
    }

    @Override
    public Object getNullableResult(ResultSet rs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parseJsonToArray(rs.getString(columnIndex), Object.class);
    }

    @Override
    public Object getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parseJsonToArray(cs.getString(columnIndex), Object.class);
    }

}

4.將Float類型的數組裝換成字符創進行存儲

package com.winturn.utils.handler;

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

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

import com.winturn.utils.CommonJsonUtil;

/**
 * <p>Filename:JsonFloatTypeHandler.java</p>
 * <p>Description: 將float類型數組裝換成字符串

</p>

 * 
 */
public class JsonFloatTypeHandler extends BaseTypeHandler<Object> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i,
            Object parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, CommonJsonUtil.stringifyObject(parameter));
    }

    @Override
    public Object getNullableResult(ResultSet rs, String columnName)
            throws SQLException {
        return CommonJsonUtil.parseJsonToFloat(rs.getString(columnName), Object.class);
    }

    @Override
    public Object getNullableResult(ResultSet rs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parseJsonToFloat(rs.getString(columnIndex), Object.class);
    }

    @Override
    public Object getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        return CommonJsonUtil.parseJsonToFloat(cs.getString(columnIndex), Object.class);
    }
}

5.將map裝換成字符串存儲到數據庫，取出時將字符串裝換成map

package com.winturn.utils.handler;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Map;

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.codehaus.jackson.map.ObjectMapper;

import com.winturn.exceptions.RolerServiceException;
import com.winturn.utils.JsonMapUtil;
/**
 * 
* @ClassName: JsonMapTypeHandler 
* @Description: 將map裝換成數組存儲數據庫，取出時將字符串裝換成map
* @author sgl
* @date 2015年12月21日 下午6:22:50
 */
public class JsonMapTypeHandler extends BaseTypeHandler<Map<String, Object>> {

    ObjectMapper mapper = new ObjectMapper();

    @Override
    public Map<String, Object> getNullableResult(ResultSet rs, String columnName) {
        try {
            String value = rs.getString(columnName);
            return mapper.readValue(value, Map.class);
        } catch (Exception e) {

        }
        return null;
    }

    @Override
    public Map<String, Object> getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        try {
            String value = rs.getString(columnIndex);
            return mapper.readValue(value, Map.class);
        } catch (Exception e) {

        }
        return null;
    }

    @Override
    public Map<String, Object> getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        try {
            String value = cs.getString(columnIndex);
            return mapper.readValue(value, Map.class);
        } catch (Exception e) {

        }
        return null;
    }

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, Map<String, Object> parameter, JdbcType jdbcType)
            throws SQLException {
        if (parameter == null) {
            ps.setNull(i, Types.VARCHAR);
        } else {
            try {
                ps.setString(i, JsonMapUtil.getJsonStrByMap(parameter));
            } catch (RolerServiceException e) {
                e.printStackTrace();
            }
        }

    }
}