Example usage for java.sql ResultSetMetaData isSigned

Introduction

In this page you can find the example usage for java.sql ResultSetMetaData isSigned.

Prototype

boolean isSigned(int column) throws SQLException;

Source Link

Document

Indicates whether values in the designated column are signed numbers.

Usage

From source file:lasige.steeldb.jdbc.BFTRowSet.java

/**
 * Initializes the given <code>RowSetMetaData</code> object with the values
 * in the given <code>ResultSetMetaData</code> object.
 *
 * @param md the <code>RowSetMetaData</code> object for this
 *           <code>CachedRowSetImpl</code> object, which will be set with
 *           values from rsmd/*w ww  . j  a  va2s.c o m*/
 * @param rsmd the <code>ResultSetMetaData</code> object from which new
 *             values for md will be read
 * @throws SQLException if an error occurs
 */
private void initMetaData(RowSetMetaDataImpl md, ResultSetMetaData rsmd) throws SQLException {
    int numCols = rsmd.getColumnCount();

    md.setColumnCount(numCols);
    for (int col = 1; col <= numCols; col++) {
        md.setAutoIncrement(col, rsmd.isAutoIncrement(col));
        if (rsmd.isAutoIncrement(col))
            updateOnInsert = true;
        md.setCaseSensitive(col, false);
        md.setCurrency(col, false);
        md.setNullable(col, rsmd.isNullable(col));
        md.setSigned(col, rsmd.isSigned(col));
        md.setSearchable(col, false);
        /*
         * The PostgreSQL drivers sometimes return negative columnDisplaySize,
         * which causes an exception to be thrown.  Check for it.
         */
        int size = rsmd.getColumnDisplaySize(col);
        if (size < 0) {
            size = 0;
        }
        md.setColumnDisplaySize(col, 0);

        if (StringUtils.isNotBlank(rsmd.getColumnLabel(col))) {
            md.setColumnLabel(col, rsmd.getColumnLabel(col).toLowerCase());
        }

        if (StringUtils.isNotBlank(rsmd.getColumnName(col))) {
            md.setColumnName(col, rsmd.getColumnName(col).toLowerCase());
        }

        md.setSchemaName(col, null);
        /*
         * Drivers return some strange values for precision, for non-numeric data, including reports of
         * non-integer values; maybe we should check type, & set to 0 for non-numeric types.
         */
        int precision = rsmd.getPrecision(col);
        if (precision < 0) {
            precision = 0;
        }
        md.setPrecision(col, 0);

        /*
         * It seems, from a bug report, that a driver can sometimes return a negative
         * value for scale.  javax.sql.rowset.RowSetMetaDataImpl will throw an exception
         * if we attempt to set a negative value.  As such, we'll check for this case.
         */
        int scale = rsmd.getScale(col);
        if (scale < 0) {
            scale = 0;
        }
        md.setScale(col, 0);
        md.setTableName(col, null);
        md.setCatalogName(col, null);
        md.setColumnType(col, -1);
        md.setColumnTypeName(col, null);
    }

    if (conn != null) {
        // JDBC 4.0 mandates as does the Java EE spec that all DataBaseMetaData methods
        // must be implemented, therefore, the previous fix for 5055528 is being backed out
        dbmslocatorsUpdateCopy = conn.getMetaData().locatorsUpdateCopy();
    }
}

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