經常在抓取一些sql語句的時候，得到的sql文字有格式的問題，如果嘗試得到執行計劃，每次都會費一番周折。
比如下面的sql語句，基本包含了常見的格式問題。第3行，第4行出現了斷行，執行的時候就會報錯。
select /*+ leading(s) index(s TABLE_BPM_STEP_INST_5IX) use_nl(s p
p step) */ s.ALLOW_CREATE, s.ASSIGNEE, s.ASYNC_RETURNED_PARAMS, s
.ATTACHER2STEP_INST, s.COMMITTER, s.CONTROL_COUNT, s.CURR_FAULT2F
AULT_INFO, s.DO_AVAIL_ON_RESUM, s.DO_FIN_ON_RESUM, s.HAS_DEPENDEN
TS, s.HAS_MARCH_REND, s.HAS_REND, s.INFLOW_BITS, s.ITER_COUNT, s.
NUM_OR_PREREQS, s.NUM_PENDING, s.NUM_PENDING_PREREQS, s.OBJID, s.
OUTFLOW_BITS, s.PARAMS, s.PARENT2PROC_INST, s.ROOT2PROC_INST, s.S
TART_TIME, s.STATUS, s.STATUS_CHANGE_TIME, s.STEP2STEP, s.TARGETE
D_BY_ALARMS, s.TRIGGERS_ALARMS, s.WAIT_TIME, s.WORKER FROM TABLE_
BPM_PROC_INST p, TABLE_BPM_STEP_INST s, TABLE_BPM_STEP step WHERE
s.root2proc_inst = p.objid AND s.step2step = step.objid AND ( NO
T (step.step_type = 4)) AND p.root_status in (0, 14) AND s.commit
ter = :1 AND s.assignee in ('BpmInServer', 'BpmInServerSmThr', 'B
pmJms') AND s.status in (50, 55) AND s.curr_fault2fault_info is n
ull and ( p.EXEC_DOMAIN like :2 )

今天下定決心使用java來格式化了一把sql文字。
格式化後的文字如下，得到的效果還是不錯的。
select /*+ leading(s) index(s TABLE_BPM_STEP_INST_5IX) use_nl(s
pp step) */ s.ALLOW_CREATE, s.ASSIGNEE, s.ASYNC_RETURNED_PARAMS,
s.ATTACHER2STEP_INST, s.COMMITTER, s.CONTROL_COUNT,
s.CURR_FAULT2FAULT_INFO, s.DO_AVAIL_ON_RESUM, s.DO_FIN_ON_RESUM,
s.HAS_DEPENDENTS, s.HAS_MARCH_REND, s.HAS_REND, s.INFLOW_BITS, s.ITER_COUNT,
s.NUM_OR_PREREQS, s.NUM_PENDING, s.NUM_PENDING_PREREQS, s.OBJID,
s.OUTFLOW_BITS, s.PARAMS, s.PARENT2PROC_INST, s.ROOT2PROC_INST,
s.START_TIME, s.STATUS, s.STATUS_CHANGE_TIME, s.STEP2STEP,
s.TARGETED_BY_ALARMS, s.TRIGGERS_ALARMS, s.WAIT_TIME, s.WORKER FROM
TABLE_BPM_PROC_INST p, TABLE_BPM_STEP_INST s, TABLE_BPM_STEP step
WHERE s.root2proc_inst = p.objid AND s.step2step = step.objid AND (
NOT (step.step_type = 4)) AND p.root_status in (0, 14) AND
s.committer = :1 AND s.assignee in ('BpmInServer', 'BpmInServerSmThr',
'BpmJms') AND s.status in (50, 55) AND s.curr_fault2fault_info is
null and ( p.EXEC_DOMAIN like :2 )

對應的java程式碼結構如下，適當做了重構，可以在稍後把java程式碼封裝一下。

點選(此處)摺疊或開啟

public class FormatSql {
public static void main(String[] args) throws IOException {
ArrayList<String> strArr = readFromFile(); //從指定的檔案中讀取檔案內容
formatSQL(strArr); //格式化sql檔案
OutputFormatSql(strArr); //輸出格式化後的sql語句
}

完整的程式碼如下：
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

public class FormatSql {

public static void main(String[] args) throws IOException {

ArrayList strArr = readFromFile();

formatSQL(strArr);

OutputFormatSql(strArr);

}

private static void formatSQL(ArrayList strArr) {
String tmpCurrLine;
String tmpNextLine;
for (int i = 0; i < strArr.size(); i++) {
tmpCurrLine = strArr.get(i);
// consider last line
if (strArr.size() == (i + 1)) {
tmpNextLine = "";
} else {
tmpNextLine = strArr.get(i + 1);
formatSqlLine(tmpCurrLine, tmpNextLine, strArr, i);
}

}
}

private static void OutputFormatSql(ArrayList strArr) {
for (int i = 0; i < strArr.size(); i++) {
System.out.println(strArr.get(i));
}
}

private static void formatSqlLine(String tmpCurrLine, String tmpNextLine,
ArrayList strArr, int i) {
String tmpCurrFormatLine;
String tmpCurrLeftLine;
for (int j = tmpCurrLine.length() - 1; j > 0;) {
if (tmpCurrLine.charAt(j) == ' ') {
tmpCurrFormatLine = tmpCurrLine.substring(0, j);
tmpCurrLeftLine = tmpCurrLine.substring(j + 1, tmpCurrLine
.length()); // keep last space
strArr.set(i, tmpCurrFormatLine);
strArr.set(i + 1, tmpCurrLeftLine + tmpNextLine);
tmpNextLine = tmpCurrLeftLine + tmpNextLine;
// System.out.println(tmpCurrFormatLine);
// System.out.println(tmpCurrLeftLine);
// System.out.println(tmpNextLine);
break;
} else {
j--;
}
}
}

private static ArrayList readFromFile()
throws FileNotFoundException, IOException {
ArrayList strArr = new ArrayList();
FileReader reader = new FileReader("c://a.sql");
BufferedReader br = new BufferedReader(reader);
String str = null;
while ((str = br.readLine()) != null) {
strArr.add(str);
}
br.close();
reader.close();
return strArr;
}

}

透過java來格式化sql語句

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