Parser (PostgreSQL JDBC Driver - JDBC 4.2 42.2.5 API)

java.lang.Object
- org.postgresql.core.Parser

```
public class Parser
extends Object
```
Basic query parser infrastructure. Note: This class should not be considered as pgjdbc public API.

Author:

Michael Paesold ([email protected]), Christopher Deckers ([email protected])

Constructor Summary

Constructors
Constructor and Description

Parser()

Constructors
Constructor and Description
`Parser()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static boolean`	`charTerminatesIdentifier(char c)`
`static int`	`digitAt(String s, int pos)` Converts digit at position `pos` in string `s` to integer or throws.
`static boolean`	`isDigitAt(String s, int pos)` Returns true if a given string `s` has digit at position `pos`.
`static boolean`	`isDollarQuoteContChar(char c)` Checks if a character is valid as the second or later character of a dollar quoting tag.
`static boolean`	`isDollarQuoteStartChar(char c)` Checks if a character is valid as the start of a dollar quoting tag.
`static boolean`	`isIdentifierContChar(char c)` Checks if a character is valid as the second or later character of an identifier.
`static boolean`	`isIdentifierStartChar(char c)` Checks if a character is valid as the start of an identifier.
`static boolean`	`isOperatorChar(char c)`
`static boolean`	`isSpace(char c)`
`static JdbcCallParseInfo`	`modifyJdbcCall(String jdbcSql, boolean stdStrings, int serverVersion, int protocolVersion)` Converts JDBC-specific callable statement escapes `{ [? =] call <some_function> [(?, [?,..])] }` into the PostgreSQL format which is `select <some_function> (?, [?, ...]) as result` or `select * from <some_function> (?, [?, ...]) as result` (7.3)
`static boolean`	`parseAsKeyword(char[] query, int offset)` Parse string to check presence of AS keyword regardless of case.
`static int`	`parseBlockComment(char[] query, int offset)` Test if the `/` character at `offset` starts a block comment, and return the position of the last `/` character.
`static boolean`	`parseDeleteKeyword(char[] query, int offset)` Parse string to check presence of DELETE keyword regardless of case.
`static int`	`parseDollarQuotes(char[] query, int offset)` Test if the dollar character (`$`) at the given offset starts a dollar-quoted string and return the offset of the ending dollar character.
`static int`	`parseDoubleQuotes(char[] query, int offset)` Find the end of the double-quoted string starting at the given offset.
`static boolean`	`parseInsertKeyword(char[] query, int offset)` Parse string to check presence of INSERT keyword regardless of case.
`static List<NativeQuery>`	`parseJdbcSql(String query, boolean standardConformingStrings, boolean withParameters, boolean splitStatements, boolean isBatchedReWriteConfigured, String... returningColumnNames)` Parses JDBC query into PostgreSQL's native format.
`static int`	`parseLineComment(char[] query, int offset)` Test if the `-` character at `offset` starts a `--` style line comment, and return the position of the first `\r` or `\n` character.
`static long`	`parseLong(String s, int beginIndex, int endIndex)` Faster version of `Long.parseLong(String)` when parsing a substring is required
`static boolean`	`parseMoveKeyword(char[] query, int offset)` Parse string to check presence of MOVE keyword regardless of case.
`static boolean`	`parseReturningKeyword(char[] query, int offset)` Parse string to check presence of RETURNING keyword regardless of case.
`static boolean`	`parseSelectKeyword(char[] query, int offset)` Parse string to check presence of SELECT keyword regardless of case.
`static int`	`parseSingleQuotes(char[] query, int offset, boolean standardConformingStrings)` Find the end of the single-quoted string starting at the given offset.
`static boolean`	`parseUpdateKeyword(char[] query, int offset)` Parse string to check presence of UPDATE keyword regardless of case.
`static boolean`	`parseValuesKeyword(char[] query, int offset)` Parse string to check presence of VALUES keyword regardless of case.
`static boolean`	`parseWithKeyword(char[] query, int offset)` Parse string to check presence of WITH keyword regardless of case.
`static String`	`replaceProcessing(String p_sql, boolean replaceProcessingEnabled, boolean standardConformingStrings)` Filter the SQL string of Java SQL Escape clauses.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Parser
```
public Parser()
```
- Method Detail
  - parseJdbcSql
```
public static List<NativeQuery> parseJdbcSql(String query,
                                             boolean standardConformingStrings,
                                             boolean withParameters,
                                             boolean splitStatements,
                                             boolean isBatchedReWriteConfigured,
                                             String... returningColumnNames)
                                      throws SQLException
```
    Parses JDBC query into PostgreSQL's native format. Several queries might be given if separated by semicolon.
    
    Parameters:
    
    query - jdbc query to parse
    
    standardConformingStrings - whether to allow backslashes to be used as escape characters in single quote literals
    
    withParameters - whether to replace ?, ? with $1, $2, etc
    
    splitStatements - whether to split statements by semicolon
    
    isBatchedReWriteConfigured - whether re-write optimization is enabled
    
    returningColumnNames - for simple insert, update, delete add returning with given column names
    
    Returns:
    
    list of native queries
    
    Throws:
    
    SQLException - if unable to add returning clause (invalid column names)
  - parseSingleQuotes
```
public static int parseSingleQuotes(char[] query,
                                    int offset,
                                    boolean standardConformingStrings)
```
    Find the end of the single-quoted string starting at the given offset.
    
    Note: for 'single '' quote in string', this method currently returns the offset of first ' character after the initial one. The caller must call the method a second time for the second part of the quoted string.
    
    Parameters:
    
    query - query
    
    offset - start offset
    
    standardConformingStrings - standard conforming strings
    
    Returns:
    
    position of the end of the single-quoted string
  - parseDoubleQuotes
```
public static int parseDoubleQuotes(char[] query,
                                    int offset)
```
    Find the end of the double-quoted string starting at the given offset.
    
    Note: for "double "" quote in string", this method currently returns the offset of first " character after the initial one. The caller must call the method a second time for the second part of the quoted string.
    
    Parameters:
    
    query - query
    
    offset - start offset
    
    Returns:
    
    position of the end of the double-quoted string
  - parseDollarQuotes
```
public static int parseDollarQuotes(char[] query,
                                    int offset)
```
    Test if the dollar character ($) at the given offset starts a dollar-quoted string and return the offset of the ending dollar character.
    
    Parameters:
    
    query - query
    
    offset - start offset
    
    Returns:
    
    offset of the ending dollar character
  - parseLineComment
```
public static int parseLineComment(char[] query,
                                   int offset)
```
    Test if the - character at offset starts a -- style line comment, and return the position of the first \r or \n character.
    
    Parameters:
    
    query - query
    
    offset - start offset
    
    Returns:
    
    position of the first \r or \n character
  - parseBlockComment
```
public static int parseBlockComment(char[] query,
                                    int offset)
```
    Test if the / character at offset starts a block comment, and return the position of the last / character.
    
    Parameters:
    
    query - query
    
    offset - start offset
    
    Returns:
    
    position of the last / character
  - parseDeleteKeyword
```
public static boolean parseDeleteKeyword(char[] query,
                                         int offset)
```
    Parse string to check presence of DELETE keyword regardless of case. The initial character is assumed to have been matched.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseInsertKeyword
```
public static boolean parseInsertKeyword(char[] query,
                                         int offset)
```
    Parse string to check presence of INSERT keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseMoveKeyword
```
public static boolean parseMoveKeyword(char[] query,
                                       int offset)
```
    Parse string to check presence of MOVE keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseReturningKeyword
```
public static boolean parseReturningKeyword(char[] query,
                                            int offset)
```
    Parse string to check presence of RETURNING keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseSelectKeyword
```
public static boolean parseSelectKeyword(char[] query,
                                         int offset)
```
    Parse string to check presence of SELECT keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseUpdateKeyword
```
public static boolean parseUpdateKeyword(char[] query,
                                         int offset)
```
    Parse string to check presence of UPDATE keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseValuesKeyword
```
public static boolean parseValuesKeyword(char[] query,
                                         int offset)
```
    Parse string to check presence of VALUES keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseLong
```
public static long parseLong(String s,
                             int beginIndex,
                             int endIndex)
```
    Faster version of Long.parseLong(String) when parsing a substring is required
    
    Parameters:
    
    s - string to parse
    
    beginIndex - begin index
    
    endIndex - end index
    
    Returns:
    
    long value
  - parseWithKeyword
```
public static boolean parseWithKeyword(char[] query,
                                       int offset)
```
    Parse string to check presence of WITH keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - parseAsKeyword
```
public static boolean parseAsKeyword(char[] query,
                                     int offset)
```
    Parse string to check presence of AS keyword regardless of case.
    
    Parameters:
    
    query - char[] of the query statement
    
    offset - position of query to start checking
    
    Returns:
    
    boolean indicates presence of word
  - isDigitAt
```
public static boolean isDigitAt(String s,
                                int pos)
```
    Returns true if a given string s has digit at position pos.
    
    Parameters:
    
    s - input string
    
    pos - position (0-based)
    
    Returns:
    
    true if input string s has digit at position pos
  - digitAt
```
public static int digitAt(String s,
                          int pos)
```
    Converts digit at position pos in string s to integer or throws.
    
    Parameters:
    
    s - input string
    
    pos - position (0-based)
    
    Returns:
    
    integer value of a digit at position pos
    
    Throws:
    
    NumberFormatException - if character at position pos is not an integer
  - isSpace
```
public static boolean isSpace(char c)
```
    Parameters:
    
    c - character
    
    Returns:
    
    true if the character is a whitespace character as defined in the backend's parser
  - isOperatorChar
```
public static boolean isOperatorChar(char c)
```
    Parameters:
    
    c - character
    
    Returns:
    
    true if the given character is a valid character for an operator in the backend's parser
  - isIdentifierStartChar
```
public static boolean isIdentifierStartChar(char c)
```
    Checks if a character is valid as the start of an identifier. PostgreSQL 9.4 allows column names like _, ‿, ⁀, ⁔, ︳, ︴, ﹍, ﹎, ﹏, ＿, so it is assumed isJavaIdentifierPart is good enough for PostgreSQL.
    
    Parameters:
    
    c - the character to check
    
    Returns:
    
    true if valid as first character of an identifier; false if not
    
    See Also:
    
    Identifiers and Key Words
  - isIdentifierContChar
```
public static boolean isIdentifierContChar(char c)
```
    Checks if a character is valid as the second or later character of an identifier.
    
    Parameters:
    
    c - the character to check
    
    Returns:
    
    true if valid as second or later character of an identifier; false if not
  - charTerminatesIdentifier
```
public static boolean charTerminatesIdentifier(char c)
```
    Parameters:
    
    c - character
    
    Returns:
    
    true if the character terminates an identifier
  - isDollarQuoteStartChar
```
public static boolean isDollarQuoteStartChar(char c)
```
    Checks if a character is valid as the start of a dollar quoting tag.
    
    Parameters:
    
    c - the character to check
    
    Returns:
    
    true if valid as first character of a dollar quoting tag; false if not
  - isDollarQuoteContChar
```
public static boolean isDollarQuoteContChar(char c)
```
    Checks if a character is valid as the second or later character of a dollar quoting tag.
    
    Parameters:
    
    c - the character to check
    
    Returns:
    
    true if valid as second or later character of a dollar quoting tag; false if not
  - modifyJdbcCall
```
public static JdbcCallParseInfo modifyJdbcCall(String jdbcSql,
                                               boolean stdStrings,
                                               int serverVersion,
                                               int protocolVersion)
                                        throws SQLException
```
    Converts JDBC-specific callable statement escapes { [? =] call <some_function> [(?, [?,..])] } into the PostgreSQL format which is select <some_function> (?, [?, ...]) as result or select * from <some_function> (?, [?, ...]) as result (7.3)
    
    Parameters:
    
    jdbcSql - sql text with JDBC escapes
    
    stdStrings - if backslash in single quotes should be regular character or escape one
    
    serverVersion - server version
    
    protocolVersion - protocol version
    
    Returns:
    
    SQL in appropriate for given server format
    
    Throws:
    
    SQLException - if given SQL is malformed
  - replaceProcessing
```
public static String replaceProcessing(String p_sql,
                                       boolean replaceProcessingEnabled,
                                       boolean standardConformingStrings)
                                throws SQLException
```
    Filter the SQL string of Java SQL Escape clauses.
    
    Currently implemented Escape clauses are those mentioned in 11.3 in the specification. Basically we look through the sql string for {d xxx}, {t xxx}, {ts xxx}, {oj xxx} or {fn xxx} in non-string sql code. When we find them, we just strip the escape part leaving only the xxx part. So, something like "select * from x where d={d '2001-10-09'}" would return "select * from x where d= '2001-10-09'".
    
    Parameters:
    
    p_sql - the original query text
    
    replaceProcessingEnabled - whether replace_processing_enabled is on
    
    standardConformingStrings - whether standard_conforming_strings is on
    
    Returns:
    
    PostgreSQL-compatible SQL
    
    Throws:
    
    SQLException - if given SQL is wrong

Class Parser

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Parser

Method Detail

parseJdbcSql

parseSingleQuotes

parseDoubleQuotes

parseDollarQuotes

parseLineComment

parseBlockComment

parseDeleteKeyword

parseInsertKeyword

parseMoveKeyword

parseReturningKeyword

parseSelectKeyword

parseUpdateKeyword

parseValuesKeyword

parseLong

parseWithKeyword

parseAsKeyword

isDigitAt

digitAt

isSpace

isOperatorChar

isIdentifierStartChar

isIdentifierContChar

charTerminatesIdentifier

isDollarQuoteStartChar

isDollarQuoteContChar

modifyJdbcCall

replaceProcessing