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table 修复selcet部分字段查询bug #13

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table 修复selcet部分字段查询bug #13

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33 changes: 26 additions & 7 deletions src/main/java/top/guoziyang/mydb/backend/tbm/Table.java
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Original file line number Diff line number Diff line change
Expand Up @@ -138,7 +138,7 @@ public int update(long xid, Update update) throws Exception {
entry.put(fd.fieldName, value);
raw = entry2Raw(entry);
long uuid = ((TableManagerImpl)tbm).vm.insert(xid, raw);

count ++;

for (Field field : fields) {
Expand All @@ -157,7 +157,7 @@ public String read(long xid, Select read) throws Exception {
byte[] raw = ((TableManagerImpl)tbm).vm.read(xid, uid);
if(raw == null) continue;
Map<String, Object> entry = parseEntry(raw);
sb.append(printEntry(entry)).append("\n");
sb.append(printEntry(entry, read)).append("\n");
}
return sb.toString();
}
Expand Down Expand Up @@ -261,12 +261,31 @@ private CalWhereRes calWhere(Field fd, Where where) throws Exception {
return res;
}

private String printEntry(Map<String, Object> entry) {
private String printEntry(Map<String, Object> entry, Select select) {
StringBuilder sb = new StringBuilder("[");
for (int i = 0; i < fields.size(); i++) {
Field field = fields.get(i);
sb.append(field.printValue(entry.get(field.fieldName)));
if(i == fields.size()-1) {

//获取select中需要的字段
int selectFieldsLen = select.fields.length;
List<Field> printField = new ArrayList<>();
if(selectFieldsLen > 0 && select.fields[0].equals("*")) {
printField = fields;
} else {
for (int i = 0; i < selectFieldsLen; i++) {
for(Field field : fields) {
if(field.fieldName.equals(select.fields[i])) {
printField.add(field);
break;
}
}
}
}

//向sb中添加需要字段的value
int len = printField.size();
for (int i = 0; i < len; i++) {
Field fd = printField.get(i);
sb.append(fd.printValue(entry.get(fd.fieldName)));
if(i == len-1) {
sb.append("]");
} else {
sb.append(", ");
Expand Down