将 T-SQL 语句转换为 JavaScript RegExp 时有什么问题

Question

我有大量从我管理的服务器记录的 T-SQL 语句。 我试图将它们归结为每个实例。

这是其中之一：

SELECT TBLLANGUAGE.NAME AS NAME1, TBLLANGUAGE_1.NAME AS NAME2, 
TBLLANGUAGELANGUAGE.LNGFKCHILD, TBLLANGUAGELANGUAGE.LNGFKPARENT, 
TBLLANGUAGELANGUAGE.STYLE, TBLLANGUAGELANGUAGE.EXTENT, 
TBLLANGUAGELANGUAGE.NATURE, TBLSOURCE.TXTTITLE, TBLSOURCE_1.TXTTITLE AS 
SURTITLE FROM ((((TBLLANGUAGE LEFT JOIN TBLLANGUAGELANGUAGE ON 
TBLLANGUAGE.ID = TBLLANGUAGELANGUAGE.LNGFKPARENT) LEFT JOIN TBLLANGUAGE 
AS TBLLANGUAGE_1 ON TBLLANGUAGELANGUAGE.LNGFKCHILD = TBLLANGUAGE_1.ID) 
LEFT JOIN TBLLANGLANGSOURCE ON TBLLANGUAGELANGUAGE.IDLANGLINK = 
TBLLANGLANGSOURCE.LNGFKLANGLINK) LEFT JOIN TBLSOURCE ON 
TBLLANGLANGSOURCE.LNGFKSOURCE = TBLSOURCE.IDSOURCE) LEFT JOIN TBLSOURCE 
AS TBLSOURCE_1 ON TBLSOURCE.LNGPARTOF = TBLSOURCE_1.IDSOURCE WHERE 
(((TBLLANGUAGELANGUAGE.LNGFKPARENT) = 8687)) OR 
(((TBLLANGUAGELANGUAGE.LNGFKCHILD) = 8687)) ORDER BY 
IIF(TBLLANGUAGELANGUAGE.LNGFKPARENT = 8687,'B','A'), TBLLANGUAGE.NAME, 
TBLLANGUAGE_1.NAME;

我想将其转换为 JavaScript RegExp，将数字运行替换为\d并将撇号之间的内容替换为'.*' 。

到目前为止，我在 Deno 方面已经做到了这一点：

function getPattern(text: string): string {
  text = text.replace(/\(/g, "\\x28")
    .replace(/\)/g, "\\x29")
    .replace(/\$/g, "\\x24")
    .replace(/\^/g, "\\x5e")
    .replace(/\./g, "\\x2e")
    .replace(/\*/g, "\\x2a")
    .replace(/\[/g, "\\x5b")
    .replace(/\]/g, "\\x5d")
    .replace(/\?/g, "\\x3f");

  [ "\\<\s\\>", "\\<", "\\<=", "=", "\\>=", "\\>"].forEach((op) => {
    const numberPattern = new RegExp(`\\s${op}\\s(\\d+)`, "g");
    text.match(numberPattern)?.forEach((e) => {
      text = text.replace(e, ` ${op} \\d+`);
    });
  });

  //const textPattern = /'[^']*'\s/g;
  const textPattern = /\s*'.*'\s*/g;
  text.match(textPattern)?.forEach((e) => {
    //const eLength = e.length;
    text = text.replace(e, "\\s*'.*'\\s*");
  });

  return text; //.replace(/\</g, "\\x3c")
    //.replace(/\>/g, "\\x3e");
}

这使得上述陈述为

SELECT TBLLANGUAGE\x2eNAME AS NAME1, TBLLANGUAGE_1\x2eNAME AS NAME2, 
TBLLANGUAGELANGUAGE\x2eLNGFKCHILD, TBLLANGUAGELANGUAGE\x2eLNGFKPARENT, 
TBLLANGUAGELANGUAGE\x2eSTYLE, TBLLANGUAGELANGUAGE\x2eEXTENT, 
TBLLANGUAGELANGUAGE\x2eNATURE, TBLSOURCE\x2eTXTTITLE, 
TBLSOURCE_1\x2eTXTTITLE AS SURTITLE FROM \x28\x28\x28\x28TBLLANGUAGE 
LEFT JOIN TBLLANGUAGELANGUAGE ON TBLLANGUAGE\x2eID = 
TBLLANGUAGELANGUAGE\x2eLNGFKPARENT\x29 LEFT JOIN TBLLANGUAGE AS 
TBLLANGUAGE_1 ON TBLLANGUAGELANGUAGE\x2eLNGFKCHILD = 
TBLLANGUAGE_1\x2eID\x29 LEFT JOIN TBLLANGLANGSOURCE ON 
TBLLANGUAGELANGUAGE\x2eIDLANGLINK = 
TBLLANGLANGSOURCE\x2eLNGFKLANGLINK\x29 LEFT JOIN TBLSOURCE ON 
TBLLANGLANGSOURCE\x2eLNGFKSOURCE = TBLSOURCE\x2eIDSOURCE\x29 LEFT JOIN 
TBLSOURCE AS TBLSOURCE_1 ON TBLSOURCE\x2eLNGPARTOF = 
TBLSOURCE_1\x2eIDSOURCE WHERE 
\x28\x28\x28TBLLANGUAGELANGUAGE\x2eLNGFKPARENT\x29 = \d+\x29\x29 OR 
\x28\x28\x28TBLLANGUAGELANGUAGE\x2eLNGFKCHILD\x29 = \d+\x29\x29 ORDER 
BY IIF\x28TBLLANGUAGELANGUAGE\x2eLNGFKPARENT = \d+,\s*'.*'\s*\x29, 
TBLLANGUAGE\x2eNAME, TBLLANGUAGE_1\x2eNAME;

我正在将各种组件转换为他们的\xnn xnn forms 因为我阅读文档的方式，显然new RegExp()不够聪明，无法看到嵌入的(并且不认为我在正则表达式中定义了一个组。也就是说，仅仅说似乎是不够的

const pattern = new RegExp("SELECT TBLLANGUAGE.NAME (etcetera)","gi");

我是不是读错了文档，有没有更好的方法？ 不，我不想编写 T-SQL 解析器，除非有一个非常非常好的理由。

Answer 1

我不完全理解您要实现的目标，但如果是：

将此 SQL 语句转换为有效的正则表达式，可以找到其他类似的 SQL

那么这将做到这一点：

 var sql = `SELECT TBLLANGUAGE.NAME AS NAME1, TBLLANGUAGE_1.NAME AS NAME2, TBLLANGUAGELANGUAGE.LNGFKCHILD, TBLLANGUAGELANGUAGE.LNGFKPARENT, TBLLANGUAGELANGUAGE.STYLE, TBLLANGUAGELANGUAGE.EXTENT, TBLLANGUAGELANGUAGE.NATURE, TBLSOURCE.TXTTITLE, TBLSOURCE_1.TXTTITLE AS SURTITLE FROM ((((TBLLANGUAGE LEFT JOIN TBLLANGUAGELANGUAGE ON TBLLANGUAGE.ID = TBLLANGUAGELANGUAGE.LNGFKPARENT) LEFT JOIN TBLLANGUAGE AS TBLLANGUAGE_1 ON TBLLANGUAGELANGUAGE.LNGFKCHILD = TBLLANGUAGE_1.ID) LEFT JOIN TBLLANGLANGSOURCE ON TBLLANGUAGELANGUAGE.IDLANGLINK = TBLLANGLANGSOURCE.LNGFKLANGLINK) LEFT JOIN TBLSOURCE ON TBLLANGLANGSOURCE.LNGFKSOURCE = TBLSOURCE.IDSOURCE) LEFT JOIN TBLSOURCE AS TBLSOURCE_1 ON TBLSOURCE.LNGPARTOF = TBLSOURCE_1.IDSOURCE WHERE (((TBLLANGUAGELANGUAGE.LNGFKPARENT) = 8687)) OR (((TBLLANGUAGELANGUAGE.LNGFKCHILD) = 8687)) ORDER BY IIF(TBLLANGUAGELANGUAGE.LNGFKPARENT = 8687,'B','A'), TBLLANGUAGE.NAME, TBLLANGUAGE_1.NAME;`; // First replace: account for JS regex special chars and escape with backslash to make them literal // Second replace: get everything between single quotes and make it.+? // Third replace: get all digit sequences and make them \d+ // Fourth replace: get all whitespace sequences and make them \s+ var sql_regex = sql.replace( /[.*+?^${}()|[\]\\]/g, '\\$&' ).replace( /('.+?')/g, '\'.+?\'' ).replace( /\d+/g, '\\d+' ).replace( /\s+/g, '\\s+' ); console.log( sql_regex ); // Test if our regex matches the string it was built from console.log( new RegExp( sql_regex, 'g' ).test( sql ) );

sql_regex的值：

SELECT\s+TBLLANGUAGE\.NAME\s+AS\s+NAME\d+,\s+TBLLANGUAGE_\d+\.NAME
\s+AS\s+NAME\d+,\s+TBLLANGUAGELANGUAGE\.LNGFKCHILD,
\s+TBLLANGUAGELANGUAGE\.LNGFKPARENT,\s+TBLLANGUAGELANGUAGE\.STYLE,
\s+TBLLANGUAGELANGUAGE\.EXTENT,\s+TBLLANGUAGELANGUAGE\.NATURE,
\s+TBLSOURCE\.TXTTITLE,\s+TBLSOURCE_\d+\.TXTTITLE\s+AS\s+SURTITLE
\s+FROM\s+\(\(\(\(TBLLANGUAGE\s+LEFT\s+JOIN\s+TBLLANGUAGELANGUAGE\s+ON
\s+TBLLANGUAGE\.ID\s+=\s+TBLLANGUAGELANGUAGE\.LNGFKPARENT\)\s+LEFT
\s+JOIN\s+TBLLANGUAGE\s+AS\s+TBLLANGUAGE_\d+\s+ON
\s+TBLLANGUAGELANGUAGE\.LNGFKCHILD\s+=\s+TBLLANGUAGE_\d+\.ID\)\s+LEFT
\s+JOIN\s+TBLLANGLANGSOURCE\s+ON\s+TBLLANGUAGELANGUAGE\.IDLANGLINK\s+=
\s+TBLLANGLANGSOURCE\.LNGFKLANGLINK\)\s+LEFT\s+JOIN\s+TBLSOURCE\s+ON
\s+TBLLANGLANGSOURCE\.LNGFKSOURCE\s+=\s+TBLSOURCE\.IDSOURCE\)\s+LEFT
\s+JOIN\s+TBLSOURCE\s+AS\s+TBLSOURCE_\d+\s+ON\s+TBLSOURCE\.LNGPARTOF
\s+=\s+TBLSOURCE_\d+\.IDSOURCE\s+WHERE
\s+\(\(\(TBLLANGUAGELANGUAGE\.LNGFKPARENT\)\s+=\s+\d+\)\)\s+OR
\s+\(\(\(TBLLANGUAGELANGUAGE\.LNGFKCHILD\)\s+=\s+\d+\)\)\s+ORDER\s+BY
\s+IIF\(TBLLANGUAGELANGUAGE\.LNGFKPARENT\s+=\s+\d+,'.+?','.+?'\),
\s+TBLLANGUAGE\.NAME,\s+TBLLANGUAGE_\d+\.NAME;

注意：新行是肤浅的，只是为了可读性而添加的