Java中的MySQL模式解析器? [英] A MySQL schema parser in Java?

问题描述

有人知道是否存在用于解析MySQL模式的Java库吗?在代码中，我希望能够确定模式中指定的表和字段.还是我需要自己写?

Does anyone know whether there is a java library for parsing a MySQL schema? In code I want to be able to determine the tables and fields specified in a schema. Or will I need to write my own?

感谢理查德.

只是想避免不必要地重新发明轮子:)

Just want to avoid re-inventing the wheel unnecessarily :)

推荐答案

回答我自己的问题:

我正在使用jsqlparser http://jsqlparser.sourceforge.net/

Am using jsqlparser http://jsqlparser.sourceforge.net/

这将解析单个语句，而不是模式中的多个语句.因此，请在;"上拆分模式.它还不喜欢'`'字符，因此需要将其删除.获取特定表的列名称的代码:

This parses individual statements, not multiple statements such as found in a schema. So split the schema on ';'. It also doesn't like the '`' character, so these need to be stripped out. Code to get column names for a particular table:

public class BUDataColumnsFinder {

public static String[] readSql(String schema) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(schema)));
    String mysql = "";
    String line;
    while ((line = br.readLine()) != null) {
        mysql = mysql + line;
    }
    br.close();
    mysql = mysql.replaceAll("`", "");
    return mysql.split(";");
}

public static List<String> getColumnNames(String tableName, String schemaFile) throws JSQLParserException, IOException {

    CCJSqlParserManager pm = new CCJSqlParserManager();
    List<String> columnNames = new ArrayList<String>();

    String[] sqlStatements = readSql(schemaFile);

    for (String sqlStatement : sqlStatements) {

        Statement statement = pm.parse(new StringReader(sqlStatement));

        if (statement instanceof CreateTable) {

            CreateTable create = (CreateTable) statement;
            String name = create.getTable().getName();

            if (name.equalsIgnoreCase(tableName)) {
                List<ColumnDefinition> columns = create.getColumnDefinitions();
                for (ColumnDefinition def : columns) {
                    columnNames.add(def.getColumnName());
                }
                break;
            }
        }
    }

    return columnNames;
}


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

    String schemaFile = "/home/john/config/bu-schema.sql";

    String tableName = "records";

    List<String> columnNames = BUDataColumnsFinder.getColumnNames(tableName, schemaFile);

    for (String name : columnNames) {
        System.out.println("name: " + name);
    }

}

}

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