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Liquibase is a tool for managing and executing database changes.

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package liquibase.statement;

import liquibase.change.ColumnConfig;
import liquibase.changelog.ChangeSet;
import liquibase.database.Database;
import liquibase.resource.ResourceAccessor;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static liquibase.util.SqlUtil.replacePredicatePlaceholders;

public class UpdateExecutablePreparedStatement extends ExecutablePreparedStatementBase {

    private String whereClause;

    private List whereColumnNames = new ArrayList<>();
    private List whereParameters = new ArrayList<>();

    public UpdateExecutablePreparedStatement(Database database, String catalogName, String schemaName, String tableName, List columns, ChangeSet changeSet, ResourceAccessor resourceAccessor) {
        super(database, catalogName, schemaName, tableName, columns, changeSet, resourceAccessor);
    }

    @Override
    public boolean continueOnError() {
        return false;
    }

    @Override
    protected String generateSql(List cols) {

        StringBuilder sql = new StringBuilder("UPDATE ").append(database.escapeTableName(getCatalogName(), getSchemaName(), getTableName()));

		StringBuilder params = new StringBuilder(" SET ");
	    for(ColumnConfig column : getColumns()) {
	    	params.append(database.escapeColumnName(getCatalogName(), getSchemaName(), getTableName(), column.getName()));
	    	params.append(" = ");
			if (column.getValueObject() instanceof DatabaseFunction) {
				params.append(column.getValueObject()).append(", ");
			} else {
				params.append("?, ");
				cols.add(column);
			}
	    }
	    params.deleteCharAt(params.lastIndexOf(" "));
	    params.deleteCharAt(params.lastIndexOf(","));
	    sql.append(params);
        if (getWhereClause() != null) {
            sql.append(" WHERE ").append(replacePredicatePlaceholders(database, getWhereClause(), getWhereColumnNames(), getWhereParameters()));
        }

        return sql.toString();
    }


    public String getWhereClause() {
        return whereClause;
    }

    public UpdateExecutablePreparedStatement setWhereClause(String whereClause) {
        this.whereClause = whereClause;

        return this;
    }

    public UpdateExecutablePreparedStatement addWhereParameter(Object value) {
        this.whereParameters.add(value);

        return this;
    }

    public UpdateExecutablePreparedStatement addWhereParameters(Object... value) {
        this.whereParameters.addAll(Arrays.asList(value));

        return this;
    }

    public UpdateExecutablePreparedStatement addWhereColumnName(String value) {
        this.whereColumnNames.add(value);

        return this;
    }

    public List getWhereParameters() {
        return whereParameters;
    }

    public List getWhereColumnNames() {
        return whereColumnNames;
    }
}
 















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