Example usage for java.sql DatabaseMetaData bestRowSession

Introduction

In this page you can find the example usage for java.sql DatabaseMetaData bestRowSession.

Prototype

int bestRowSession

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Document

Indicates that the scope of the best row identifier is the remainder of the current session.

Usage

From source file:io.vitess.jdbc.VitessMySQLDatabaseMetadata.java

@SuppressWarnings("StringBufferReplaceableByString")
public ResultSet getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable)
        throws SQLException {
    ResultSet resultSet = null;/* w  w w.j a  va  2s. c o  m*/
    VitessStatement vitessStatement = new VitessStatement(this.connection);

    if (null == table) {
        throw new SQLException("Table Parameter cannot be null in getBestRowIdentifier");
    }

    String[] columnName = new String[] { "SCOPE", "COLUMN_NAME", "DATA_TYPE", "TYPE_NAME", "COLUMN_SIZE",
            "BUFFER_LENGTH", "DECIMAL_DIGITS", "PSEUDO_COLUMN" };

    Query.Type[] columnType = new Query.Type[] { Query.Type.INT16, Query.Type.CHAR, Query.Type.INT32,
            Query.Type.CHAR, Query.Type.INT32, Query.Type.INT32, Query.Type.INT16, Query.Type.INT16 };

    ArrayList<ArrayList<String>> data = new ArrayList<>();

    try {
        resultSet = vitessStatement.executeQuery("SHOW COLUMNS FROM " + this.quotedId + table + this.quotedId
                + "" + " FROM " + this.quotedId + catalog + this.quotedId);

        while (resultSet.next()) {
            ArrayList<String> row = new ArrayList<>();
            String keyType = resultSet.getString("Key");
            if (keyType != null && StringUtils.startsWithIgnoreCase(keyType, "PRI")) {
                row.add(Integer.toString(DatabaseMetaData.bestRowSession));
                row.add(resultSet.getString("Field"));
                String type = resultSet.getString("Type");
                int size = this.maxBufferSize;
                int decimals = 0;
                if (type.indexOf("enum") != -1) {
                    String temp = type.substring(type.indexOf("("), type.indexOf(")"));
                    StringTokenizer tokenizer = new StringTokenizer(temp, ",");

                    int maxLength;
                    for (maxLength = 0; tokenizer.hasMoreTokens(); maxLength = Math.max(maxLength,
                            tokenizer.nextToken().length() - 2))
                        ;

                    size = maxLength;
                    decimals = 0;
                    type = "enum";
                } else if (type.indexOf("(") != -1) {
                    if (type.indexOf(",") != -1) {
                        size = Integer.parseInt(type.substring(type.indexOf("(") + 1, type.indexOf(",")));
                        decimals = Integer.parseInt(type.substring(type.indexOf(",") + 1, type.indexOf(")")));
                    } else {
                        size = Integer.parseInt(type.substring(type.indexOf("(") + 1, type.indexOf(")")));
                    }

                    type = type.substring(0, type.indexOf("("));
                }

                row.add(Integer.toString(MysqlDefs.mysqlToJavaType(type)));
                row.add(type);
                row.add(Integer.toString(size + decimals));
                row.add(Integer.toString(size + decimals));
                row.add(Integer.toString(decimals));
                row.add(Integer.toString(DatabaseMetaData.bestRowNotPseudo));
                data.add(row);
            }
        }
    } finally {
        if (resultSet != null) {
            resultSet.close();
        }
        vitessStatement.close();
    }
    return new VitessResultSet(columnName, columnType, data, this.connection);
}

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