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SPL(Structured Process Language) A programming language specially for structured data computing.
package com.scudata.dm.sql;
import com.scudata.common.ArgumentTokenizer;
import com.scudata.common.IntArrayList;
import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.DataStruct;
import com.scudata.dm.Record;
import com.scudata.dm.Sequence;
import com.scudata.resources.EngineMessage;
/**
* ???ڴ???sql.sqlparse??sql.sqltranslate????
* @author RunQian
*
*/
public final class SQLUtil {
private static Sequence parseFilter(String sql, Token []tokens, int index, int endPos) {
Sequence seq = new Sequence();
IntArrayList andList = new IntArrayList();
for (int i = index + 1, count = tokens.length; i < count && tokens[i].getPos() < endPos; ++i) {
Token token = tokens[i];
if (token.isKeyWord("AND")) {
andList.addInt(i);
} else if (token.isKeyWord("OR")) {
andList.clear();
} else if (token.getType() == Tokenizer.LPAREN) {
i = Tokenizer.scanParen(tokens, i, count);
}
}
int size = andList.size();
int prev = tokens[index].getPos();
for (int i = 0; i < size; ++i) {
int t = andList.getInt(i);
String exp = sql.substring(prev, tokens[t].getPos());
seq.add(exp.trim());
prev = tokens[t + 1].getPos();
}
String exp = sql.substring(prev, endPos);
seq.add(exp.trim());
return seq;
}
private static int pos(int p1, Token []tokens, int len) {
if (p1 > 0) return tokens[p1].getPos();
return len;
}
private static int pos(int p1, int p2, Token []tokens, int len) {
if (p1 > 0) return tokens[p1].getPos();
if (p2 > 0) return tokens[p2].getPos();
return len;
}
private static int pos(int p1, int p2, int p3, Token []tokens, int len) {
if (p1 > 0) return tokens[p1].getPos();
if (p2 > 0) return tokens[p2].getPos();
if (p3 > 0) return tokens[p3].getPos();
return len;
}
private static int pos(int p1, int p2, int p3, int p4, Token []tokens, int len) {
if (p1 > 0) return tokens[p1].getPos();
if (p2 > 0) return tokens[p2].getPos();
if (p3 > 0) return tokens[p3].getPos();
if (p4 > 0) return tokens[p4].getPos();
return len;
}
// ????()????ʼλ??????????
public static int scanParen(Token []tokens, int start, final int next) {
int deep = 0;
for (int i = start + 1; i < next; ++i) {
if (tokens[i].getType() == Tokenizer.LPAREN) {
deep++;
} else if (tokens[i].getType() == Tokenizer.RPAREN) {
if (deep == 0) return i;
deep--;
}
}
return -1;
}
private static DataStruct DS_SQL = new DataStruct(new String[]{"type", "id", "value"});
private static String TYPE_KEYWORD = "keyword";
private static int splitWith(Token []tokens, int pos, Record result) {
return -1;
}
private static int splitSelect(Token []tokens, int pos, Record result) {
return -1;
}
/**
* ???SQL?ĸ??????ַ??س?????
* @param sql
* @return Sequence
*/
public static Sequence splitSql(String sql) {
Token []tokens = Tokenizer.parse(sql);
int len = tokens.length;
if (len == 0) {
return null;
}
Sequence result = new Sequence();
int pos = 0;
Token token = tokens[0];
if (token.isKeyWord("WITH")) {
// with alias_name1 as (select1)[,alias_namei as (selecti) ]
Record r = new Record(DS_SQL);
r.setNormalFieldValue(0, TYPE_KEYWORD);
r.setNormalFieldValue(1, "WITH");
int end = splitWith(tokens, 0, r);
result.add(r);
if (end < len) {
pos = end;
token = tokens[pos];
} else {
return result;
}
}
if (token.isKeyWord("SELECT")) {
Record r = new Record(DS_SQL);
r.setNormalFieldValue(0, TYPE_KEYWORD);
r.setNormalFieldValue(1, "SELECT");
int end = splitSelect(tokens, 0, r);
result.add(r);
if (end < len) {
pos = end;
token = tokens[pos];
} else {
return result;
}
}
return null;
}
public static Object parse(String sql, String option) {
boolean isSelect = false, isFrom = false, isWhere = false,
isGroupBy = false, isHaving = false, isOrderBy = false;
boolean isArray = false, isAll = true;
if (option != null) {
if (option.indexOf('s') != -1) {
isSelect = true;
isAll = false;
}
if (option.indexOf('f') != -1) {
isFrom = true;
isAll = false;
}
if (option.indexOf('w') != -1) {
isWhere = true;
isAll = false;
}
if (option.indexOf('g') != -1) {
isGroupBy = true;
isAll = false;
}
if (option.indexOf('h') != -1) {
isHaving = true;
isAll = false;
}
if (option.indexOf('o') != -1) {
isOrderBy = true;
isAll = false;
}
if (option.indexOf('a') != -1) {
isArray = true;
}
}
int len = sql.length();
Token []tokens = Tokenizer.parse(sql);
int select = -1;
int count = tokens.length;
for (int i = 0; i < count; ++i) {
if (tokens[i].isKeyWord("SELECT")) {
select = i;
break;
} else if (tokens[i].getType() == Tokenizer.LPAREN) {
i = scanParen(tokens, i, count);
if (i == -1) {
return null;
}
}
}
if (select == -1) {
return null;
}
int from = -1;
for (int i = select + 1; i < count; ++i) {
if (tokens[i].isKeyWord("FROM")) {
from = i;
break;
} else if (tokens[i].getType() == Tokenizer.LPAREN) {
i = scanParen(tokens, i, count);
if (i == -1) {
return null;
}
}
}
if (from == -1) {
return null;
}
int where = -1;
int group = -1;
int having = -1;
int order = -1;
for (int i = from + 1; i < count; ++i) {
if (where == -1 && tokens[i].isKeyWord("WHERE")) {
where = i;
} else if (group == -1 && tokens[i].isKeyWord("GROUP")) {
group = i;
} else if (having == -1 && tokens[i].isKeyWord("HAVING")) {
having = i;
} else if (order == -1 && tokens[i].isKeyWord("ORDER")) {
order = i;
} else if (tokens[i].getType() == Tokenizer.LPAREN) {
i = scanParen(tokens, i, count);
if (i == -1) {
return null;
}
}
}
if (isAll) {
Sequence result = new Sequence(6);
String cols = sql.substring(tokens[select + 1].getPos(), tokens[from].getPos());
cols = cols.trim();
if (isArray) {
ArgumentTokenizer arg = new ArgumentTokenizer(cols);
Sequence seq = new Sequence();
result.add(seq);
while (arg.hasMoreElements()) {
seq.add(arg.nextElement());
}
} else {
result.add(cols);
}
String tables = sql.substring(tokens[from + 1].getPos(), pos(where, group, having, order, tokens, len));
result.add(tables.trim());
if (where == -1) {
result.add(null);
} else if (isArray) {
Sequence seq = parseFilter(sql, tokens, where + 1, pos(group, having, order, tokens, len));
result.add(seq);
} else {
String whereExp = sql.substring(tokens[where + 1].getPos(), pos(group, having, order, tokens, len));
result.add(whereExp.trim());
}
if (group == -1) {
result.add(null);
} else {
group++;
if (group == count || !tokens[group].isKeyWord("BY")) {
throw new RQException("Invalid group.");
}
String groupExp = sql.substring(tokens[group + 1].getPos(), pos(having, order, tokens, len));
groupExp = groupExp.trim();
if (isArray) {
ArgumentTokenizer arg = new ArgumentTokenizer(groupExp);
Sequence seq = new Sequence();
result.add(seq);
while (arg.hasMoreElements()) {
seq.add(arg.nextElement());
}
} else {
result.add(groupExp);
}
}
if (having == -1) {
result.add(null);
} else if (isArray) {
Sequence seq = parseFilter(sql, tokens, having + 1, pos(order, tokens, len));
result.add(seq);
} else {
String havingExp = sql.substring(tokens[having + 1].getPos(), pos(order, tokens, len));
result.add(havingExp.trim());
}
if (order == -1) {
result.add(null);
} else {
order++;
if (order == count || !tokens[order].isKeyWord("BY")) {
throw new RQException("Invalid order.");
}
String orderExp = sql.substring(tokens[order + 1].getPos());
orderExp = orderExp.trim();
if (isArray) {
ArgumentTokenizer arg = new ArgumentTokenizer(orderExp);
Sequence seq = new Sequence();
result.add(seq);
while (arg.hasMoreElements()) {
seq.add(arg.nextElement());
}
} else {
result.add(orderExp);
}
}
return result;
}
Sequence result = new Sequence(6);
if (isSelect) {
String cols = sql.substring(tokens[select + 1].getPos(), tokens[from].getPos());
cols = cols.trim();
if (isArray) {
ArgumentTokenizer arg = new ArgumentTokenizer(cols);
Sequence seq = new Sequence();
result.add(seq);
while (arg.hasMoreElements()) {
seq.add(arg.nextElement());
}
} else {
result.add(cols);
}
}
if (isFrom) {
String tables = sql.substring(tokens[from + 1].getPos(), pos(where, group, having, order, tokens, len));
result.add(tables.trim());
}
if (isWhere) {
if (where == -1) {
result.add(null);
} else if (isArray) {
Sequence seq = parseFilter(sql, tokens, where + 1, pos(group, having, order, tokens, len));
result.add(seq);
} else {
String whereExp = sql.substring(tokens[where + 1].getPos(), pos(group, having, order, tokens, len));
result.add(whereExp.trim());
}
}
if (isGroupBy) {
if (group == -1) {
result.add(null);
} else {
group++;
if (group == count || !tokens[group].isKeyWord("BY")) {
throw new RQException("Invalid group.");
}
String groupExp = sql.substring(tokens[group + 1].getPos(), pos(having, order, tokens, len));
groupExp = groupExp.trim();
if (isArray) {
ArgumentTokenizer arg = new ArgumentTokenizer(groupExp);
Sequence seq = new Sequence();
result.add(seq);
while (arg.hasMoreElements()) {
seq.add(arg.nextElement());
}
} else {
result.add(groupExp);
}
}
}
if (isHaving) {
if (having == -1) {
result.add(null);
} else if (isArray) {
Sequence seq = parseFilter(sql, tokens, having + 1, pos(order, tokens, len));
result.add(seq);
} else {
String havingExp = sql.substring(tokens[having + 1].getPos(), pos(order, tokens, len));
result.add(havingExp.trim());
}
}
if (isOrderBy) {
if (order == -1) {
result.add(null);
} else {
order++;
if (order == count || !tokens[order].isKeyWord("BY")) {
throw new RQException("Invalid order.");
}
String orderExp = sql.substring(tokens[order + 1].getPos());
orderExp = orderExp.trim();
if (isArray) {
ArgumentTokenizer arg = new ArgumentTokenizer(orderExp);
Sequence seq = new Sequence();
result.add(seq);
while (arg.hasMoreElements()) {
seq.add(arg.nextElement());
}
} else {
result.add(orderExp);
}
}
}
if (result.length() == 1) {
return result.get(1);
} else {
return result;
}
}
/**
* ?滻sql??ָ??????
* @param sql SQL???
* @param replacement Ҫ?滻?ɵ?????
* @param option ѡ?ָ???滻??Щ????
* @return
*/
public static String replace(String sql, String replacement, String option) {
if (option == null) {
MessageManager mm = EngineMessage.get();
throw new RQException("sqlparse" + mm.getMessage("engine.optError"));
}
if (replacement == null) {
replacement = "";
}
Token []tokens = Tokenizer.parse(sql);
int count = tokens.length;
String keyWord; // ?ؼ??ֶ????ƣ????Դsql??û???ⲿ??????Ҫ?¼?
int keyPos = -1; // ?ؼ??ֵ?λ?ã????replacementΪ????ɾ???ⲿ??
int start = -1; // ?ؼ??ֺ????ݵ?λ??
int end = -1;
if (option.indexOf('s') != -1) {
keyWord = "SELECT";
for (int i = 0; i < count; ++i) {
if (tokens[i].isKeyWord("SELECT")) {
keyPos = i;
start = i;
break;
} else if (tokens[i].getType() == Tokenizer.LPAREN) {
i = scanParen(tokens, i, count);
if (i == -1) {
return sql;
}
}
}
if (start == -1) {
return sql;
}
start++;
for (int i = start; i < count; ++i) {
Token token = tokens[i];
if (token.isKeyWord("FROM")) {
end = i;
break;
} else if (token.isKeyWord("TOP")) {
i++; // top n
start = i + 1;
} else if (token.isKeyWord("DISTINCT")) {
start = i + 1;
} else if (token.getType() == Tokenizer.LPAREN) {
i = scanParen(tokens, i, count);
if (i == -1) {
return sql;
}
}
}
if (end == -1) {
return sql;
}
} else {
String startKeyWord;
String []endKeyWords;
if (option.indexOf('f') != -1) {
keyWord = startKeyWord = "FROM";
endKeyWords = new String[]{"WHERE", "GROUP", "HAVING", "ORDER", "LIMIT"};
} else if (option.indexOf('w') != -1) {
keyWord = startKeyWord = "WHERE";
endKeyWords = new String[]{"GROUP", "HAVING", "ORDER", "LIMIT"};
} else if (option.indexOf('g') != -1) {
startKeyWord = "GROUP";
keyWord = "GROUP BY";
endKeyWords = new String[]{"HAVING", "ORDER", "LIMIT"};
} else if (option.indexOf('h') != -1) {
keyWord = startKeyWord = "HAVING";
endKeyWords = new String[]{"ORDER", "LIMIT"};
} else if (option.indexOf('o') != -1) {
startKeyWord = "ORDER";
keyWord = "ORDER BY";
endKeyWords = new String[]{"LIMIT"};
} else {
MessageManager mm = EngineMessage.get();
throw new RQException("sqlparse" + mm.getMessage("engine.optError"));
}
for (int i = 0; i < count; ++i) {
if (tokens[i].isKeyWord(startKeyWord)) {
keyPos = i;
start = i + 1;
if (start < count && tokens[start].isKeyWord("BY")) {
start++; // group by / order by
}
break;
} else if (tokens[i].getType() == Tokenizer.LPAREN) {
i = scanParen(tokens, i, count);
if (i == -1) {
return sql;
}
}
}
int len = endKeyWords.length;
Next:
for (int i = start == -1 ? 0 : start; i < count; ++i) {
Token token = tokens[i];
if (token.isKeyWord()) {
for (int k = 0; k < len; ++k) {
if (token.isKeyWord(endKeyWords[k])) {
end = i;
break Next;
}
}
} else if (token.getType() == Tokenizer.LPAREN) {
i = scanParen(tokens, i, count);
if (i == -1) {
return sql;
}
}
}
}
if (start == -1) {
if (replacement.length() == 0) {
return sql;
} else if (end == -1) {
return sql + ' ' + keyWord + ' ' + replacement;
} else {
int endPos = tokens[end].getPos();
return sql.substring(0, endPos) + keyWord + ' ' + replacement + sql.substring(endPos - 1);
}
} else if (start == count) {
// ֻ?йؼ??ֺ???û????
if (replacement.length() == 0) {
int startPos = tokens[keyPos].getPos();
return sql.substring(0, startPos);
} else {
return sql + ' ' + replacement;
}
} else {
if (replacement.length() == 0) {
start = keyPos;
}
int startPos = tokens[start].getPos();
if (end == -1) {
return sql.substring(0, startPos) + replacement;
} else {
int endPos = tokens[end].getPos();
return sql.substring(0, startPos) + replacement + sql.substring(endPos - 1);
}
}
}
// ????SQL?????????SQL??????top?ͺ???
// DBTypes?ﶨ???????ݿ????ͳ???
public static String translate(String sql, String dbType) {
Token []tokens = Tokenizer.parse(sql);
int count = tokens.length;
int prevPos = 0;
String rowNum = null;
StringBuffer sb = new StringBuffer(sql.length() * 2);
for (int i = 0, last = count - 1; i < last; ++i) {
Token token = tokens[i];
if (tokens[i + 1].getType() == Tokenizer.LPAREN &&
FunInfoManager.isFunction(dbType, token.getString())) {
int match = Tokenizer.scanParen(tokens, i + 1, count);
String exp = scanFunction(sql, tokens, i, match, dbType);
if (exp != null) {
sb.append(sql.substring(prevPos, token.getPos()));
sb.append(exp);
prevPos = tokens[match].getPos() + 1;
i = match;
} else {
i++;
}
} else if (token.isKeyWord("TOP")) {
// ???????ݿ?????ת??????Ӧ???
if (tokens[i + 1].getType() == Tokenizer.NUMBER) {
if ("ORACLE".endsWith(dbType) || "DB2".endsWith(dbType) || "MYSQL".endsWith(dbType)
|| "HSQL".endsWith(dbType) || "POSTGRES".endsWith(dbType) || "HIVE".endsWith(dbType)
|| "IMPALA".endsWith(dbType) || "GREENPLUM".endsWith(dbType)) {
i++;
rowNum = tokens[i].getString();
sb.append(sql.substring(prevPos, token.getPos()));
prevPos = tokens[i].getPos() + rowNum.length();
} else if ("INFMIX".endsWith(dbType)) {
i++;
sb.append(sql.substring(prevPos, token.getPos()));
sb.append(" FIRST ");
sb.append(tokens[i].getString());
prevPos = tokens[i].getPos() + tokens[i].getString().length();
}
}
}
}
if (sb.length() == 0) {
return sql;
}
sb.append(sql.substring(prevPos));
if (rowNum != null) {
if ("ORACLE".endsWith(dbType)) {
sb.insert(0, "SELECT * FROM (");
sb.append(")t WHERE ROWNUM<=");
sb.append(rowNum);
} else if ("DB2".endsWith(dbType)) {
sb.append(" FETCH FIRST ");
sb.append(rowNum);
sb.append(" ROWS ONLY");
} else if ("MYSQL".endsWith(dbType)||"HSQL".endsWith(dbType)||"POSTGRES".endsWith(dbType)
||"HIVE".endsWith(dbType)||"IMPALA".endsWith(dbType)||"GREENPLUM".endsWith(dbType)) {
sb.append(" LIMIT ");
sb.append(rowNum);
} else {
throw new RQException();
}
}
return sb.toString();
}
// end??????
private static String translate(String sql, Token []tokens, int start, int end, String dbType) {
StringBuffer sb = new StringBuffer();
int prevPos = tokens[start].getPos();
for (int i = start; i < end; ++i) {
Token token = tokens[i];
if (tokens[i + 1].getType() == Tokenizer.LPAREN &&
FunInfoManager.isFunction(dbType, token.getString())) {
int match = Tokenizer.scanParen(tokens, i + 1, end);
String exp = scanFunction(sql, tokens, i, match, dbType);
if (exp != null) {
sb.append(sql.substring(prevPos, token.getPos()));
sb.append(exp);
prevPos = tokens[match].getPos() + 1;
i = match;
} else {
i++;
}
}
}
if (sb.length() == 0) {
return null;
} else {
sb.append(sql.substring(prevPos, tokens[end].getPos()));
return sb.toString();
}
}
// f(), f(p1,...) next??')'??λ??
private static String scanFunction(String sql, Token []tokens, int start, int next, String dbType) {
String name = tokens[start].getString();
start += 2;
if (start == next) {
return FunInfoManager.getFunctionExp(dbType, name, new String[0]);
}
int pcount;
int commaCount;
IntArrayList commaList = new IntArrayList();
for (int i = start; i < next;) {
int p = Tokenizer.scanComma(tokens, i, next);
if (p > 0) {
commaList.addInt(p);
i = p + 1;
} else {
break;
}
}
commaCount = commaList.size();
pcount = commaCount + 1;
String []params = new String[pcount];
for (int i = 0; i < commaCount; ++i) {
int pos = commaList.getInt(i);
params[i] = translate(sql, tokens, start, pos, dbType);
if (params[i] == null) {
params[i] = sql.substring(tokens[start].getPos(), tokens[pos].getPos());
}
start = pos + 1;
}
params[commaCount] = translate(sql, tokens, start, next, dbType);
if (params[commaCount] == null) {
params[commaCount] = sql.substring(tokens[start].getPos(), tokens[next].getPos());
}
return FunInfoManager.getFunctionExp(dbType, name, params);
//return changeFunction(name, exp, params);
}
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