README.md · GitHub导入/JSqlParser

# [JSqlParser 4.7 Website](https://jsqlparser.github.io/JSqlParser) <img src="src/site/sphinx/_images/logo-no-background.svg" alt="drawing" width="200" align="right"/>

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## Summary

Please visit the [WebSite](https://jsqlparser.github.io/JSqlParser). **JSqlParser** is a RDBMS agnostic SQL statement parser. It translates SQL statements into a traversable hierarchy of Java classes (see [Samples](https://jsqlparser.github.io/JSqlParser/usage.html#parse-a-sql-statements)):

```sql
SELECT 1 FROM dual WHERE a = b
```

```text
SQL Text
 └─Statements: statement.select.PlainSelect
    ├─selectItems: statement.select.SelectItem
    │  └─LongValue: 1
    ├─Table: dual
    └─where: expression.operators.relational.EqualsTo
       ├─Column: a
       └─Column: b
```

```java
String sqlStr = "select 1 from dual where a=b";

PlainSelect select = (PlainSelect) CCJSqlParserUtil.parse(sqlStr);

SelectItem selectItem =
        select.getSelectItems().get(0);
Assertions.assertEquals(
        new LongValue(1)
        , selectItem.getExpression());

Table table = (Table) select.getFromItem();
Assertions.assertEquals("dual", table.getName());

EqualsTo equalsTo = (EqualsTo) select.getWhere();
Column a = (Column) equalsTo.getLeftExpression();
Column b = (Column) equalsTo.getRightExpression();
Assertions.assertEquals("a", a.getColumnName());
Assertions.assertEquals("b", b.getColumnName());
}
```

## [Supported Grammar and Syntax](https://jsqlparser.github.io/JSqlParser/syntax.html)

**JSqlParser** aims to support the SQL standard as well as all major RDBMS. Any missing syntax or features can be added on demand.

| RDBMS | Statements |
|-----------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------|
| Oracle MS SQL Server and Sybase Postgres MySQL and MariaDB DB2 H2 and HSQLDB and Derby SQLite | `SELECT` `INSERT`, `UPDATE`, `UPSERT`, `MERGE` `DELETE`, `TRUNCATE TABLE` `CREATE ...`, `ALTER ....`, `DROP ...` `WITH ...` |

**JSqlParser** can also be used to create SQL Statements from Java Code with a fluent API (see [Samples](https://jsqlparser.github.io/JSqlParser/usage.html#build-a-sql-statements)).

## Alternatives to JSqlParser?
[**General SQL Parser**](http://www.sqlparser.com/features/introduce.php?utm_source=github-jsqlparser&utm_medium=text-general) looks pretty good, with extended SQL syntax (like PL/SQL and T-SQL) and java + .NET APIs. The tool is commercial (license available online), with a free download option.

## [Documentation](https://jsqlparser.github.io/JSqlParser)
  1. [Samples](https://jsqlparser.github.io/JSqlParser/usage.html#parse-a-sql-statements)
  2. [Build Instructions](https://jsqlparser.github.io/JSqlParser/usage.html) and [Maven Artifact](https://jsqlparser.github.io/JSqlParser/usage.html#build-dependencies)
  3. [Contribution](https://jsqlparser.github.io/JSqlParser/contribution.html)
  4. [Change Log](https://jsqlparser.github.io/JSqlParser/changelog.html#latest-changes-since-jsqlparser-version)
  5. [Issues](https://github.com/JSQLParser/JSqlParser/issues)

## License

**JSqlParser** is dual licensed under **LGPL V2.1** or **Apache Software License, Version 2.0**.

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