package org.jtester.module.database.util;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jtester.bytecode.reflector.FieldAccessor;
import org.jtester.bytecode.reflector.helper.ClazzHelper;
import org.jtester.core.IJTester.DataMap;
import org.jtester.exception.NoSuchFieldRuntimeException;
import org.jtester.module.dbfit.db.model.DbParameterAccessor;
import org.jtester.utility.JTesterLogger;
import org.jtester.utility.StringHelper;
@SuppressWarnings({ "rawtypes", "unchecked" })
public final class DBHelper {
/**
* 关闭数据库statement句柄
*/
public static void closeStatement(Statement st) {
if (st == null) {
return;
}
try {
st.close();
st = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
public static void closeResultSet(ResultSet rs) {
if (rs == null) {
return;
}
try {
rs.close();
rs = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 将ResultSet的当前行转换为Map数据返回
*
* @param rs
* 数据库结果ResultSet
* @param rsmd
* ResultSet的meta数据
* @return
* @throws SQLException
*/
public static Map getMapFromResult(ResultSet rs, ResultSetMetaData rsmd, boolean isCamelName) throws Exception {
Map<String, Object> map = new HashMap<String, Object>();
int count = rsmd.getColumnCount();
for (int index = 1; index <= count; index++) {
String key = getCamelFieldName(rsmd, index, isCamelName);
Object o = rs.getObject(index);
Object value = DbParameterAccessor.normaliseValue(o);
map.put(key, value);
}
return map;
}
/**
* 将ResultSet的转换为Map List数据返回
*
* @param rs
* @param rsmd
* @return
* @throws SQLException
*/
public static List<Map> getListMapFromResult(ResultSet rs, ResultSetMetaData rsmd, boolean isCamelName)
throws Exception {
List<Map> list = new ArrayList<Map>();
while (rs.next()) {
Map map = getMapFromResult(rs, rsmd, isCamelName);
list.add(map);
}
return list;
}
/**
* 将ResultSet的当前行转换为PoJo数据返回
*
* @param <T>
* @param rs
* @param rsmd
* @param clazz
* @return
* @throws SQLException
*/
public static <T> T getPoJoFromResult(ResultSet rs, ResultSetMetaData rsmd, Class<T> clazz) throws Exception {
int count = rsmd.getColumnCount();
if (count == 1) {
Object o = rs.getObject(1);
Object value = DbParameterAccessor.normaliseValue(o);
return (T) value;
}
T pojo = ClazzHelper.newInstance(clazz);
for (int index = 1; index <= count; index++) {
String key = getCamelFieldName(rsmd, index, true);
try {
FieldAccessor accessor = new FieldAccessor(clazz, key);
Object o = rs.getObject(index);
Object value = DbParameterAccessor.normaliseValue(o);
accessor.set(pojo, value);
} catch (NoSuchFieldRuntimeException e) {
JTesterLogger.warn("set pojo property errro: " + e.getMessage());
}
}
return pojo;
}
/**
* 将ResultSet的当前行转换为PoJo列表数据返回
*
* @param <T>
* @param rs
* @param rsmd
* @param clazz
* @return
* @throws SQLException
*/
public static <T> List<T> getListPoJoFromResult(ResultSet rs, ResultSetMetaData rsmd, Class<T> clazz)
throws Exception {
List list = new ArrayList();
while (rs.next()) {
T o = getPoJoFromResult(rs, rsmd, clazz);
list.add(o);
}
return list;
}
/**
* 返回数据库查询结果集第index个字段的camel名称
*
* @param rsmd
* @param index
* @param isCamelName
* 是否过滤非法字符后返回驼峰命名<br>
* false:返回数据库的原生字段名称
* @return
* @throws SQLException
*/
private static String getCamelFieldName(ResultSetMetaData rsmd, int index, boolean isCamelName) throws SQLException {
String columnName = rsmd.getColumnName(index);
if (isCamelName) {
columnName = columnName.replaceAll("[^a-zA-Z0-9]", " ");
String fieldName = StringHelper.camel(columnName.toLowerCase());
return fieldName;
} else {
return columnName;
}
}
/**
* 填充数据
*
* @param map
* @param table
*/
public static void fillData(Map<String, Object> map, String table) {
}
/**
* 分解sql语句为单条可执行的sql语句集合,并过滤注释
*
* @param content
* 多条sql语句(可能包含注释，换行等信息)
* @return
*/
public static String[] parseSQL(String content) {
char[] chars = content.toCharArray();
List<String> statements = new ArrayList<String>();
StamentStatus status = StamentStatus.NORMAL;
StringBuffer buff = new StringBuffer();
for (int index = 0; index < chars.length; index++) {
char ch = chars[index];
char next = '\0';
switch (status) {
case SINGLE_NOTE:
if (ch == '\n' || ch == '\r') {
buff.append(' ');
status = StamentStatus.NORMAL;
}
break;
case MULTI_NOTE:
next = (index == chars.length - 1) ? '/' : chars[index + 1];
if (ch == '*' && next == '/') {
index++;
status = StamentStatus.NORMAL;
}
break;
case SINGLE_QUOTATION:
buff.append(ch);
if (ch == '\'') {
status = StamentStatus.NORMAL;
}
break;
case DOUBLE_QUOTATION:
buff.append(ch);
if (ch == '"') {
status = StamentStatus.NORMAL;
}
break;
case NORMAL:
next = (index == chars.length - 1) ? ';' : chars[index + 1];
if (ch == '-' && next == '-') {
index++;
status = StamentStatus.SINGLE_NOTE;
} else if (ch == '/' && next == '*') {
index++;
status = StamentStatus.MULTI_NOTE;
} else if (ch == '\'') {
buff.append(ch);
status = StamentStatus.SINGLE_QUOTATION;
} else if (ch == '"') {
buff.append(ch);
status = StamentStatus.DOUBLE_QUOTATION;
} else if (ch == ';') {
String statement = buff.toString().trim();
if ("".equals(statement) == false) {
statements.add(statement);
}
buff = new StringBuffer();
} else if (ch == '\n' || ch == '\r') {
buff.append(' ');
} else {
buff.append(ch);
}
break;
}
}
String statement = buff.toString().trim();
if ("".equals(statement) == false) {
statements.add(statement);
}
String[] stmts = new String[statements.size()];
statements.toArray(stmts);
return stmts;
}
/**
* 根据DataMap构造查询条件
*
* @param map
* @return
*/
public static String getWhereCondiction(DataMap map) {
if (map == null || map.size() == 0) {
return "";
}
StringBuilder where = new StringBuilder();
where.append(" where ");
boolean isFirst = true;
for (String key : map.keySet()) {
if (isFirst) {
isFirst = false;
} else {
where.append(" and ");
}
where.append(key).append("=?");
}
return where.toString();
}
}